重构项目结构，移除Assignment相关功能，优化Submission模块

- 添加学生提交管理服务 (StudentSubmissionService, StudentSubmissionDetailService)
- 新增学生提交相关控制器 (StudentSubmissionController, StudentSubmissionDetailController)
- 添加学生提交数据传输对象 (StudentSubmissionDetailDto, StudentSubmissionSummaryDto)
- 新增学生提交相关页面组件 (StudentExamView, ExamDetailView, StudentCard等)
- 添加学生提交信息卡片组件 (SubmissionInfoCard, TeacherSubmissionInfoCard)
- 更新数据库迁移文件以支持提交系统

.gitea/workflows/ci.yaml

@@ -1,10 +1,10 @@
-name: Tech
+name: TechAct
 
 on: [push] # 当有新的push事件发生时触发此工作流程
 
 jobs:
   explore-gitea-actions:
-    runs-on: 	Tech
+    runs-on: TechAct
     steps:
       - uses: actions/checkout@v4 # 使用actions/checkout来克隆您的仓库代码
       - run: echo "💡 The ${{ gitea.repository }} repository has been cloned to the runner."

.vscode/launch.json

@@ -0,0 +1,7 @@
+{
+    // 使用 IntelliSense 了解相关属性。 
+    // 悬停以查看现有属性的描述。
+    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": []
+}

EmailLib/Dockerfile

@@ -0,0 +1,8 @@
+# ./EmailLib/Dockerfile
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS eamillib
+WORKDIR /src
+COPY ../EmailLib/*.csproj ./EmailLib/
+RUN dotnet restore "EmailLib/EmailLib.csproj"
+
+COPY ../EmailLib/. ./EmailLib/
+RUN dotnet publish "EmailLib/EmailLib.csproj" -c Release -o /publish

Entities/Contracts/AppMainStruct.cs

@@ -0,0 +1,168 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.Contracts
+{
+	public enum Layout : byte
+	{
+		horizontal = 0,
+		vertical = 1,
+
+		Auto = 2
+	}
+
+	public enum Publisher : byte
+	{
+		Unknown = 0,
+		统编版,
+		部编版,
+	}
+
+	public enum GradeEnum : byte
+	{
+		Unknown = 0,
+		一年级 = 1,
+		二年级 = 2,
+		三年级 = 3,
+		四年级 = 4,
+		五年级 = 5,
+		六年级 = 6
+	}
+
+	public enum DifficultyLevel : byte
+	{
+		simple,
+		easy,
+		medium,
+		hard,
+		veryHard
+	}
+
+	public enum TypeNameType : byte
+	{
+		Subject = 0,
+		QuestionType = 1,
+		ExamType = 2,
+	}
+
+	public enum SubjectAreaEnum : byte
+	{
+		[Display(Name = "未知", Description = "未知")]
+		Unknown = 0,
+
+		[Display(Name = "数学", Description = "数")]
+		Mathematics,      // 数学
+
+		[Display(Name = "物理", Description = "物")]
+		Physics,          // 物理
+
+		[Display(Name = "化学", Description = "化")]
+		Chemistry,        // 化学
+
+		[Display(Name = "生物", Description = "生")]
+		Biology,          // 生物
+
+		[Display(Name = "历史", Description = "史")]
+		History,          // 历史
+
+		[Display(Name = "地理", Description = "地")]
+		Geography,        // 地理
+
+		[Display(Name = "语文", Description = "语")]
+		Literature,      // 语文/文学
+
+		[Display(Name = "英语", Description = "英")]
+		English,          // 英语
+
+		[Display(Name = "计算机科学", Description = "计")]
+		ComputerScience // 计算机科学
+	}
+
+	public enum ExamStructType : byte
+	{
+		[Display(Name = "根节点", Description = "根")]
+		Root,
+		[Display(Name = "单个问题", Description = "问")]
+		Question,
+		[Display(Name = "问题组", Description = "组")]
+		Group,
+		[Display(Name = "结构", Description = "结")]
+		Struct,
+		[Display(Name = "子问题", Description = "子")]
+		SubQuestion,
+		[Display(Name = "选项", Description = "选")]
+		Option
+	}
+	
+	public enum UserRoles
+	{
+		Student,
+		Teacher,
+		Admin
+	}
+
+	public enum SubmissionStatus
+	{
+		[Display(Name = "待提交/未开始", Description = "待")]
+		Pending,
+
+		[Display(Name = "已提交", Description = "提")]
+		Submitted,
+
+		[Display(Name = "已批改", Description = "批")]
+		Graded,
+
+		[Display(Name = "待重新提交", Description = "重")]
+		Resubmission,
+
+		[Display(Name = "迟交", Description = "迟")]
+		Late,
+
+		[Display(Name = "草稿", Description = "草")]
+		Draft,
+	}
+
+	public static class EnumExtensions
+	{
+		public static string GetDisplayName(this Enum enumValue)
+		{
+			var fieldInfo = enumValue.GetType().GetField(enumValue.ToString());
+
+			if (fieldInfo == null)
+			{
+				return enumValue.ToString(); 
+			}
+
+			var displayAttribute = fieldInfo.GetCustomAttribute<DisplayAttribute>();
+
+			if (displayAttribute != null)
+			{
+				return displayAttribute.Name;
+			}
+
+			return enumValue.ToString();
+		}
+
+		public static string GetShortName(this Enum enumValue)
+		{
+			var memberInfo = enumValue.GetType().GetMember(enumValue.ToString()).FirstOrDefault();
+
+			if (memberInfo != null)
+			{
+				var displayAttribute = memberInfo.GetCustomAttribute<DisplayAttribute>();
+
+				if (displayAttribute != null && !string.IsNullOrEmpty(displayAttribute.Description))
+				{
+					return displayAttribute.Description;
+				}
+			}
+
+			return enumValue.ToString();
+		}
+	}
+}

Entities/Contracts/Assignment.cs

@@ -1,66 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations.Schema;
-using System.ComponentModel.DataAnnotations;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Entities.Contracts
-{
-	[Table("assignments")]
-	public class Assignment
-	{
-		[Key]
-		[Column("id")]
-		public Guid Id { get; set; }
-
-		[Required]
-		[Column("title")]
-		[StringLength(255)]
-		public string Title { get; set; }
-
-		[Column("description")]
-		public string Description { get; set; }
-
-		[Column("subject_area")]
-		public string SubjectArea { get; set; }
-
-		[Required]
-		[Column("due_date")]
-		public DateTime DueDate { get; set; }
-
-		[Column("total_points")]
-		public float? TotalPoints { get; set; }
-
-		[Column("created_by")]
-		[ForeignKey("Creator")]
-		public Guid CreatedBy { get; set; }
-
-		[Column("created_at")]
-		public DateTime CreatedAt { get; set; }
-
-		[Column("updated_at")]
-		public DateTime UpdatedAt { get; set; }
-
-		[Column("deleted")]
-		public bool IsDeleted { get; set; }
-
-		// Navigation Properties
-		public User Creator { get; set; }
-		public ICollection<AssignmentClass> AssignmentClasses { get; set; }
-		public ICollection<AssignmentGroup> AssignmentGroups { get; set; }
-		public ICollection<AssignmentAttachment> AssignmentAttachments { get; set; }
-		public ICollection<Submission> Submissions { get; set; }
-
-		public Assignment()
-		{
-			Id = Guid.NewGuid();
-
-			Submissions = new HashSet<Submission>();
-			AssignmentGroups = new HashSet<AssignmentGroup>();
-			AssignmentClasses = new HashSet<AssignmentClass>();
-			AssignmentAttachments = new HashSet<AssignmentAttachment>();
-		}
-	}
-}

Entities/Contracts/AssignmentClass.cs

@@ -1,36 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations.Schema;
-using System.ComponentModel.DataAnnotations;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Entities.Contracts
-{
-	[Table("assignment_class")]
-	public class AssignmentClass
-	{
-		[Key]
-		[Column("assignment_id", Order = 0)]
-		[ForeignKey("Assignment")]
-		public Guid AssignmentId { get; set; }
-
-		[Key]
-		[Column("class_id", Order = 1)]
-		[ForeignKey("Class")]
-		public Guid ClassId { get; set; }
-
-		[Column("assigned_at")]
-		public DateTime AssignedAt { get; set; }
-
-		[Column("deleted")]
-		public bool IsDeleted { get; set; }
-
-		// Navigation Properties
-		public Assignment Assignment { get; set; }
-		public Class Class { get; set; }
-
-
-	}
-}

Entities/Contracts/AssignmentGroup.cs

@@ -1,61 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations.Schema;
-using System.ComponentModel.DataAnnotations;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Entities.Contracts
-{
-	[Table("assignment_group")]
-	public class AssignmentGroup
-	{
-		[Key]
-		[Column("id")]
-		public Guid Id { get; set; }
-
-		[Column("assignment")]
-		[ForeignKey("Assignment")]
-		public Guid? AssignmentId { get; set; }
-
-		[Required]
-		[Column("title")]
-		[MaxLength(65535)] 
-		public string Title { get; set; }
-
-		[Column("descript")]
-		[MaxLength(65535)] 
-		public string Descript { get; set; }
-
-
-		[Column("total_points")]
-		public float? TotalPoints { get; set; }
-
-		[Column("number")]
-		public byte Number { get; set; }
-
-		[Column("parent_group")]
-		public Guid? ParentGroup { get; set; }
-
-		[Column("deleted")]
-		public bool IsDeleted { get; set; }
-
-		[Column("valid_question_group")]
-		public bool ValidQuestionGroup { get; set; }
-
-		// Navigation Properties
-		public Assignment? Assignment { get; set; }
-		public AssignmentGroup? ParentAssignmentGroup { get; set;}
-		public ICollection<AssignmentGroup> ChildAssignmentGroups { get; set; }
-		public ICollection<AssignmentQuestion> AssignmentQuestions { get; set; }
-
-
-		public AssignmentGroup()
-		{
-			Id = Guid.NewGuid();
-			ChildAssignmentGroups = new HashSet<AssignmentGroup>();
-			AssignmentQuestions = new HashSet<AssignmentQuestion>();
-		}
-	}
-}

Entities/Contracts/AssignmentQuestion.cs

@@ -1,62 +0,0 @@
-using Microsoft.EntityFrameworkCore;
-using System;
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations.Schema;
-using System.ComponentModel.DataAnnotations;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Entities.Contracts
-{
-	[Table("assignment_questions")]
-	public class AssignmentQuestion
-	{
-		[Key]
-		[Column("id")]
-		public Guid Id { get; set; }
-
-		[Column("question_id")]
-		public Guid? QuestionId { get; set; } // 设为可空
-
-		// 当 IsGroup 为 true 时，此为 QuestionGroup 的外键
-		[Column("question_group_id")] // 新增一个外键列
-		public Guid? QuestionGroupId { get; set; } // 设为可空
-
-		[Required]
-		[Column("group_id")]
-		[ForeignKey("AssignmentGroup")]
-		public Guid AssignmentGroupId { get; set; }
-
-
-		[Required]
-		[Column("question_number")]
-		public byte QuestionNumber { get; set; }
-
-
-		[Column("created_at")]
-		public DateTime CreatedAt { get; set; }
-
-		[Column("score")]
-		public float? Score { get; set; }
-
-		[Required]
-		[Column("bgroup")]
-		public bool IsGroup { get; set; }
-
-		[Column("deleted")]
-		public bool IsDeleted { get; set; }
-
-
-		public Question Question { get; set; }
-		public QuestionGroup QuestionGroup { get; set; }	
-		public ICollection<SubmissionDetail> SubmissionDetails { get; set; }
-		public AssignmentGroup AssignmentGroup { get; set; }
-
-		public AssignmentQuestion()
-		{
-			Id = Guid.NewGuid();
-			SubmissionDetails = new HashSet<SubmissionDetail>();
-		}
-	}
-}

Entities/Contracts/Class.cs

@@ -2,9 +2,6 @@
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations.Schema;
 using System.ComponentModel.DataAnnotations;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace Entities.Contracts
 {
@@ -12,21 +9,25 @@ namespace Entities.Contracts
 	public class Class
 	{
 		[Key]
-		[Column("id")]
+		[Column("class_id")]
 		public Guid Id { get; set; }
 
-		[Column("grade")]
-		public byte Grade { get; set; }
+		[Column("grade_id")]
+		public Guid GradeId { get; set; }
+		[ForeignKey(nameof(GradeId))]
+		public virtual Grade Grade { get; set; }
 
-		[Column("class")]
-		public byte Number { get; set; }
+		[Column("index")]
+		public byte Index { get; set; }
 
-		[Column("description")]
-		public string Description { get; set; }
+		[Column("class_name")]
+		[MaxLength(30)]
+		public string ClassName { get; set; }
 
 		[Column("head_teacher_id")]
 		public Guid? HeadTeacherId { get; set; }
-		public User HeadTeacher { get; set; }
+		[ForeignKey(nameof(HeadTeacherId))]
+		public virtual User HeadTeacher { get; set; }
 
 		[Column("created_at")]
 		public DateTime CreatedAt { get; set; }
@@ -38,18 +39,22 @@ namespace Entities.Contracts
 		public bool IsDeleted { get; set; }
 
 		// Navigation Properties
-		public ICollection<ClassTeacher> ClassTeachers { get; set; }
-		public ICollection<ClassStudent> ClassStudents { get; set; }
-		public ICollection<AssignmentClass> AssignmentClasses { get; set; }
+
+		[NotMapped]
+		public ICollection<ClassUser> Techers => ClassUsers.Where(cu => cu.User.Role == UserRoles.Teacher).ToList();
+
+		[NotMapped]
+		public ICollection<ClassUser> Students => ClassUsers.Where(cu => cu.User.Role == UserRoles.Student).ToList();
+
+		[InverseProperty(nameof(ClassUser.Class))]
+		public virtual ICollection<ClassUser> ClassUsers { get; set; }
 
 		public Class()
 		{
 			Id = Guid.NewGuid();
-			Grade = 0;
-			Number = 0;
-			ClassStudents = new HashSet<ClassStudent>();
-			ClassTeachers = new HashSet<ClassTeacher>();
-			AssignmentClasses = new HashSet<AssignmentClass>();
+			ClassUsers = new HashSet<ClassUser>();
+			CreatedAt = DateTime.Now;
+			UpdatedAt = DateTime.Now;
 		}
 	}
 }

Entities/Contracts/ClassStudent.cs

@@ -1,34 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations.Schema;
-using System.ComponentModel.DataAnnotations;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Entities.Contracts
-{
-	[Table("class_student")]
-	public class ClassStudent
-	{
-		[Key]
-		[Column("class_id", Order = 0)]
-		[ForeignKey("Class")]
-		public Guid ClassId { get; set; }
-
-		[Key]
-		[Column("student_id", Order = 1)]
-		[ForeignKey("Student")]
-		public Guid StudentId { get; set; }
-
-		[Column("enrollment_date")]
-		public DateTime EnrollmentDate { get; set; }
-
-		[Column("deleted")]
-		public bool IsDeleted { get; set; }
-
-		// Navigation Properties
-		public Class Class { get; set; }
-		public User Student { get; set; }
-	}
-}

Entities/Contracts/ClassTeacher.cs

@@ -1,27 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations;
-using System.ComponentModel.DataAnnotations.Schema;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Entities.Contracts
-{
-	[Table("class_teachers")]
-	public class ClassTeacher
-	{
-		[Key] 
-		[Column("class_id")]
-		public Guid ClassId { get; set; }
-		public Class Class { get; set; }
-
-		[Key] 
-		[Column("teacher_id")] 
-		public Guid TeacherId { get; set; }
-		public User Teacher { get; set; }
-
-		[Column("subject_taught")]
-		public string SubjectTaught { get; set; }
-	}
-}

Entities/Contracts/ClassUser.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+
+namespace Entities.Contracts
+{
+	/// <summary>
+	/// 班级用户关联实体类
+	/// 表示用户与班级之间的多对多关系
+	/// </summary>
+	[Table("class_user")]
+    [PrimaryKey(nameof(ClassId), nameof(UserId))]
+    public class ClassUser
+    {
+        /// <summary>
+        /// 班级ID，复合主键的一部分，外键
+        /// 关联到Class表中的班级
+        /// </summary>
+        [Key]
+        [Column("class_id", Order = 0)]
+        public Guid ClassId { get; set; }
+        [ForeignKey(nameof(ClassId))]
+		public virtual Class Class { get; set; }
+		/// <summary>
+		/// 用户ID，复合主键的一部分，外键
+		/// 关联到User表中的用户用户
+		/// </summary>
+		[Key]
+        [Column("student_id", Order = 1)]
+        public Guid UserId { get; set; }
+		[ForeignKey(nameof(UserId))]
+		public virtual User User { get; set; }
+
+		/// <summary>
+		/// 入学日期
+		/// 记录用户加入该班级的日期
+		/// </summary>
+		[Column("enrollment_date")]
+        public DateTime EnrollmentDate { get; set; }
+
+        /// <summary>
+        /// 是否已删除
+        /// 软删除标记，true表示已删除
+        /// </summary>
+        [Column("deleted")]
+        public bool IsDeleted { get; set; }
+
+
+
+    }
+}

Entities/Contracts/Exam.cs

@@ -0,0 +1,122 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Entities.DTO;
+
+namespace Entities.Contracts
+{
+	[Table("exams")]
+	public class Exam
+	{
+		[Key]
+		[Column("id")]
+		public Guid Id { get; set; }
+
+		[Required]
+		[Column("title")]
+		[StringLength(255)]
+		public string Title { get; set; }
+
+		[Column("description")]
+		public string Description { get; set; }
+
+		[Column("subject_id")]
+		public Guid SubjectId { get; set; }
+		[ForeignKey(nameof(SubjectId))]
+		public virtual Subject Subject { get; set; }
+
+		[Required]
+		[Column("exam_struct_id")]
+		[ForeignKey(nameof(ExamStruct))]
+		public Guid ExamStructId { get; set; }
+		public virtual ExamQuestion ExamStruct { get; set; }
+
+		[Column("exam_type_id")]
+		public Guid ExamTypeId { get; set; }
+		[ForeignKey(nameof(ExamTypeId))]
+		public virtual ExamType ExamType { get; set; }
+
+		[Column("created_by")]
+		public Guid CreatorId { get; set; }
+		[ForeignKey(nameof(CreatorId))]
+		public virtual User Creator { get; set; }
+
+		[Required]
+		[Column("due_date")]
+		public DateTime DueDate { get; set; }
+
+		[Column("total_points")]
+		public byte TotalQuestions { get; set; }
+
+		[Column("score")]
+		public float Score { get; set; }
+
+		[Column("name")]
+		public string Name { get; set; } = string.Empty;
+
+		[Column("created_at")]
+		public DateTime CreatedAt { get; set; }
+
+		[Column("updated_at")]
+		public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+
+		[Column("deleted")]
+		public bool IsDeleted { get; set; } = false;
+
+
+		[InverseProperty(nameof(ExamAttachment.Exam))]
+		public virtual ICollection<ExamAttachment> ExamAttachments { get; set; }
+		[InverseProperty(nameof(Submission.Exam))]
+		public virtual ICollection<Submission> Submissions { get; set; }
+
+		public Exam()
+		{
+			Id = Guid.NewGuid();
+
+			ExamAttachments = new HashSet<ExamAttachment>();
+			Submissions = new HashSet<Submission>();
+		}
+	}
+
+
+	public static class examExt
+	{
+		public static Submission ConvertToSubmission(this Exam exam, Guid studentId, Guid GraderId, Guid classId)
+		{
+			if (exam == null) return new Submission();
+			var submission = new Submission();
+
+			submission.StudentId = studentId;
+			submission.SubmissionTime = DateTime.Now;
+			submission.Status = SubmissionStatus.Pending;
+			submission.GraderId = GraderId;
+			submission.ExamId = exam.Id;
+			submission.ClassId = classId;
+			ConvertExamSturctToSubmissionDetails(exam.ExamStruct, studentId, submission.SubmissionDetails);
+
+			return submission;
+		}
+
+
+		public static void ConvertExamSturctToSubmissionDetails(ExamQuestion examStruct, Guid studentId, ICollection<SubmissionDetail> submissions)
+		{
+			if (examStruct == null) return;
+			submissions.Add(new SubmissionDetail
+			{
+				StudentId = studentId,
+				ExamQuestionId = examStruct.Id,
+				CreatedAt = DateTime.Now,
+				UpdatedAt = DateTime.Now,
+			});
+
+			examStruct.ChildExamQuestions?.ToList().ForEach(s =>
+			{
+				ConvertExamSturctToSubmissionDetails(s, studentId, submissions);
+			});
+		}
+	}
+}

Entities/Contracts/ExamAttachment.cs

@@ -9,17 +9,18 @@ using System.Diagnostics.CodeAnalysis;
 
 namespace Entities.Contracts
 {
-	[Table("assignment_attachments")]
-	public class AssignmentAttachment
+	[Table("exam_attachments")]
+	public class ExamAttachment
 	{
 		[Key]
 		[Column("id")]
 		public Guid Id { get; set; }
 
 		[Required]
-		[Column("assignment_id")]
-		[ForeignKey("Assignment")]
-		public Guid AssignmentId { get; set; }
+		[Column("exam_id")]
+		public Guid ExamId { get; set; }
+		[ForeignKey(nameof(ExamId))]
+		public virtual Exam Exam { get; set; }
 
 		[Required]
 		[Column("file_path")]
@@ -37,10 +38,7 @@ namespace Entities.Contracts
 		[Column("deleted")]
 		public bool IsDeleted { get; set; }
 
-		// Navigation Properties
-		public Assignment Assignment { get; set; }
-
-		public AssignmentAttachment()
+		public ExamAttachment()
 		{
 			Id = Guid.NewGuid();
 		}

Entities/Contracts/ExamQuestion.cs

@@ -0,0 +1,71 @@
+using System.ComponentModel.DataAnnotations.Schema;
+using System.ComponentModel.DataAnnotations;
+using Entities.DTO;
+
+namespace Entities.Contracts
+{
+	[Table("exam_questions")]
+	public class ExamQuestion
+	{
+		[Key]
+		[Column("id")]
+		public Guid Id { get; set; }
+
+		[Column("title")]
+		[MaxLength(1024)]
+		public string? Title { get; set; }
+
+		[Column("question_id")]
+		public Guid? QuestionId { get; set; }
+		[ForeignKey(nameof(QuestionId))]
+		public virtual Question? Question { get; set; }
+
+		[Column("description")]
+		public Guid? QuestionContextId { get; set; }
+		[ForeignKey(nameof(QuestionContextId))]
+		public virtual QuestionContext? QuestionContext { get; set; }
+
+		[Required]
+		[Column("question_number")]
+		public byte Index { get; set; }
+
+		[Column("sequence")]
+		public string Sequence { get; set; } = string.Empty;
+
+		[Column("parent_question_group_id")]
+		public Guid? ParentExamQuestionId { get; set; }
+		[ForeignKey(nameof(ParentExamQuestionId))]
+		public virtual ExamQuestion? ParentExamQuestion { get; set; }
+
+		public Guid QuestionTypeId { get;set; }
+		[ForeignKey(nameof(QuestionTypeId))]
+		public virtual QuestionType Type { get; set; }
+
+		[Column("created_at")]
+		public DateTime CreatedAt { get; set; }
+
+		[Column("exam_struct_type")]
+		public ExamStructType ExamStructType { get; set; }
+		
+		[Column("score")]
+		public float? Score { get; set; }
+
+		[Column("deleted")]
+		public bool IsDeleted { get; set; }
+
+
+		public virtual Exam? Exam { get; set; }
+
+
+		[InverseProperty(nameof(SubmissionDetail.ExamQuestion))]
+		public virtual ICollection<SubmissionDetail> SubmissionDetails { get; set; }
+		[InverseProperty(nameof(ParentExamQuestion))]
+		public virtual ICollection<ExamQuestion> ChildExamQuestions { get; set; } = new List<ExamQuestion>();
+
+		public ExamQuestion()
+		{
+			Id = Guid.NewGuid();
+			SubmissionDetails = new HashSet<SubmissionDetail>();
+		}
+	}
+}

Entities/Contracts/ExamType.cs

@@ -0,0 +1,30 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Entities.Contracts
+{
+    [Table("exam_type")]
+    public class ExamType
+	{
+        [Key]
+        [Column("id")]
+        public Guid Id { get; set; }
+
+        [Column("name")]
+        [MaxLength(20)]
+        public string Name { get; set; }
+
+        [Column("description")]
+        public string Description { get; set; }
+
+        [InverseProperty(nameof(Exam.ExamType))]
+        public virtual ICollection<Exam> Exams { get; set; }
+
+        public ExamType()
+        {
+			Id = Guid.NewGuid();
+			Exams = new HashSet<Exam>();
+        }
+    }
+}

Entities/Contracts/Grade.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Entities.Contracts
+{
+    [Table("grades")]
+    public class Grade
+    {
+        [Key]
+        [Column("grade_id")]
+        public Guid Id { get; set; }
+
+        [Column("school_id")]
+        public Guid SchoolId { get; set; }
+        public virtual School School { get; set; }
+
+        [Column("grade_name")]
+        [MaxLength(20)]
+        public string GradeName { get; set; }
+
+        [Column("grade_level")]
+        public byte GradeLevel { get; set; }
+
+        [InverseProperty(nameof(Class.Grade))]  
+        public virtual ICollection<Class> Classes { get; set; }
+
+        public Grade()
+        {
+            Id = Guid.NewGuid();
+            Classes = new HashSet<Class>();
+        }
+    }
+}

Entities/Contracts/Question.cs

@@ -16,37 +16,47 @@ namespace Entities.Contracts
 		public Guid Id { get; set; }
 
 		[Required]
-		[Column("question_text")]
+		[Column("title")]
 		[MaxLength(65535)]
-		public string QuestionText { get; set; }
+		public string Title { get; set; }
+
+		[Column("answer")]
+		[MaxLength(65535)]
+		public string? Answer { get; set; }
 
 		[Required]
-		[Column("question_type")]
-		[MaxLength(20)]
-		public QuestionType QuestionType { get; set; } 
-
-		[Column("correct_answer")]
-		[MaxLength(65535)]
-		public string CorrectAnswer { get; set; }
-
-		[Column("question_group_id")]
-		public Guid? QuestionGroupId { get; set; }
-
-		[Column("difficulty_level")]
-		[MaxLength(10)] 
-		public DifficultyLevel DifficultyLevel { get; set; } 
+		[Column("type")]
+		public Guid QuestioTypeId { get; set; }
+		[ForeignKey(nameof(QuestioTypeId))]
+		public virtual QuestionType QuestionType { get; set; }
 
 		[Column("subject_area")]
-		public SubjectAreaEnum SubjectArea { get; set; }
+		public Guid SubjectId { get; set; }
+		[ForeignKey(nameof(SubjectId))]
+		public virtual Subject Subject { get; set; }
+
+		[Column("key_point")]
+		public Guid? KeyPointId { get; set; }
+		[ForeignKey(nameof(KeyPointId))]
+		public virtual KeyPoint? KeyPoint { get; set; }
+
+		[Column("lesson")]
+		public Guid? LessonId { get; set; }
+		[ForeignKey(nameof(LessonId))]
+		public virtual Lesson? Lesson { get; set; }
+
+		//[Required]
+		//[Column("created_by")]
+		//public Guid CreatorId { get; set; }
+		//[ForeignKey(nameof(CreatorId))]
+		//public virtual User Creator { get; set; }
+
+		//[Column("difficulty_level")]
+		//public DifficultyLevel DifficultyLevel { get; set; } = DifficultyLevel.easy;
 
 		[Column("options")]
 		public string? Options { get; set; }
 
-		[Required]
-		[Column("created_by")]
-		[ForeignKey("Creator")]
-		public Guid CreatedBy { get; set; }
-
 		[Column("created_at")]
 		public DateTime CreatedAt { get; set; }
 
@@ -56,54 +66,15 @@ namespace Entities.Contracts
 		[Column("deleted")]
 		public bool IsDeleted { get; set; }
 
-		[Column("valid_question")]
-		public bool ValidQuestion { get; set; }
-
-		// Navigation Properties
-		public User Creator { get; set; }
-		public QuestionGroup QuestionGroup { get; set; }
-		public ICollection<AssignmentQuestion> AssignmentQuestions { get; set; }
+		[InverseProperty(nameof(ExamQuestion.Question))]
+		public virtual ICollection<ExamQuestion>? ExamQuestions { get; set; }
 
 		public Question()
 		{
 			Id = Guid.NewGuid();
-			AssignmentQuestions = new HashSet<AssignmentQuestion>();
+			ExamQuestions = new HashSet<ExamQuestion>();
 		}
 	}
 
-	public enum DifficultyLevel
-	{
-		easy,
-		medium,
-		hard
-	}
 
-	public enum QuestionType
-	{
-		Unknown, // 可以有一个未知类型或作为默认
-		Spelling,           // 拼写
-		Pronunciation,      // 给带点字选择正确读音
-		WordFormation,      // 组词
-		FillInTheBlanks,    // 选词填空 / 补充词语
-		SentenceDictation,  // 默写句子
-		SentenceRewriting,  // 仿句 / 改写句子
-		ReadingComprehension, // 阅读理解
-		Composition         // 作文
-							// ... 添加您其他题目类型
-	}
-
-	public enum SubjectAreaEnum // 建议命名为 SubjectAreaEnum 以避免与属性名冲突
-	{
-		Unknown,         // 未知或默认
-		Mathematics,     // 数学
-		Physics,         // 物理
-		Chemistry,       // 化学
-		Biology,         // 生物
-		History,         // 历史
-		Geography,       // 地理
-		Literature,      // 语文/文学
-		English,         // 英语
-		ComputerScience, // 计算机科学
-						 // ... 你可以根据需要添加更多科目
-	}
 }

Entities/Contracts/QuestionContext.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.Contracts
+{
+	public class QuestionContext
+	{
+		public Guid Id { get; set; }
+
+		public string Description { get; set; } = string.Empty;
+
+		[InverseProperty(nameof(ExamQuestion.QuestionContext))]	
+		public virtual ICollection<ExamQuestion>? Questions { get; set; } = new List<ExamQuestion>();
+
+
+		public QuestionContext()
+		{
+			Questions = new HashSet<ExamQuestion>();
+		}
+	}
+}

Entities/Contracts/QuestionGroup.cs

@@ -1,79 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations.Schema;
-using System.ComponentModel.DataAnnotations;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Entities.Contracts
-{
-	[Table("question_groups")]
-	public class QuestionGroup
-	{
-		[Key]
-		[Column("id")]
-		public Guid Id { get; set; }
-
-		[Column("title")]
-		[MaxLength(255)]
-		public string Title { get; set; }
-
-		[Required]
-		[Column("description")]
-		[MaxLength(65535)]
-		public string Description { get; set; }
-
-		[Column("type")]
-		[MaxLength(50)]
-		public string Type { get; set; }
-
-		[Column("difficulty_level")]
-		[MaxLength(10)]
-		public DifficultyLevel DifficultyLevel { get; set; }
-
-		[Column("subject_area")]
-		public SubjectAreaEnum SubjectArea { get; set; }
-
-		[Column("total_questions")]
-		public int TotalQuestions { get; set; } = 0;
-
-		[Column("parent_question_group")]
-		public Guid? ParentQG { get; set; }
-
-		[Required]
-		[Column("created_by")]
-		[ForeignKey("Creator")]
-		public Guid CreatedBy { get; set; }
-
-		[Column("created_at")]
-		public DateTime CreatedAt { get; set; }
-
-		[Column("updated_at")]
-		public DateTime UpdatedAt { get; set; }
-
-		[Column("deleted")]
-		public bool IsDeleted { get; set; }
-
-		[Column("valid_group")]
-		public bool ValidGroup { get; set; }
-
-
-
-		public User Creator { get; set; }
-		public QuestionGroup ParentQuestionGroup { get; set; }
-		public ICollection<QuestionGroup> ChildQuestionGroups { get; set; }
-		public ICollection<AssignmentQuestion> AssignmentQuestions { get; set; }
-		public ICollection<Question> Questions { get; set; }
-
-		public QuestionGroup()
-		{
-			Id = Guid.NewGuid();
-			Questions = new HashSet<Question>();
-			CreatedAt = DateTime.UtcNow;
-			UpdatedAt = DateTime.UtcNow;
-			IsDeleted = false;
-			ValidGroup = true;
-		}
-	}
-}

Entities/Contracts/QuestionType.cs

@@ -0,0 +1,40 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Entities.Contracts
+{
+    [Table("question_types")]
+    public class QuestionType
+    {
+        [Key]
+        [Column("id")]
+        public Guid Id { get; set; }
+
+        [Column("name")]
+        [MaxLength(20)]
+        public string Name { get; set; }
+
+        [Column("subject_id")]
+        public Guid SubjectId { get; set; }
+        [ForeignKey(nameof(SubjectId))]
+        public virtual Subject Subject { get; set; }
+
+        [Column("description")]
+        public string Description { get; set; }
+
+        [Column("score_rule")]
+        [MaxLength(20)]
+        public string ScoreRule { get; set; }
+
+        [InverseProperty(nameof(Question.QuestionType))]
+        public virtual IEnumerable<Question> Questions { get; set; }
+
+        public QuestionType()
+        {
+            Id = Guid.NewGuid();
+
+			Questions = new HashSet<Question>();
+		}
+	}
+}

Entities/Contracts/School.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Entities.Contracts
+{
+    [Table("schools")]
+    public class School
+    {
+        [Key]
+        [Column("id")]
+        public Guid Id { get; set; }
+
+        [Column("school_name")]
+        [MaxLength(50)]
+        public string SchoolName { get; set; }
+
+        [Column("address")]
+        [MaxLength(100)]
+        public string Address { get; set; }
+
+        [Column("create_time")]
+        public DateTime CreateTime { get; set; }
+
+        [InverseProperty(nameof(Grade.School))]
+        public virtual ICollection<Grade> Grades { get; set; }
+
+        public School()
+        {
+            Id = Guid.NewGuid();
+            Grades = new HashSet<Grade>();
+            CreateTime = DateTime.Now;
+        }
+    }
+}

Entities/Contracts/Subject.cs

@@ -0,0 +1,36 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Entities.Contracts
+{
+    [Table("subjects")]
+    public class Subject
+    {
+        [Key]
+        [Column("id")]
+        public Guid Id { get; set; }
+
+        [Column("name")]
+        [MaxLength(20)]
+        public string Name { get; set; }
+
+        [Column("description")]
+        public string Description { get; set; }
+
+        [InverseProperty(nameof(QuestionType.Subject))]
+        public virtual IEnumerable<QuestionType> QuestionTypes { get; set; }
+
+        [InverseProperty(nameof(Question.Subject))]
+        public virtual IEnumerable<Question> Questions { get; set; }
+
+        [InverseProperty(nameof(User.TeachSubject))]
+        public virtual IEnumerable<User> SubjectTeachers { get; set; }
+        public Subject()
+        {
+            Id = Guid.NewGuid();
+            QuestionTypes = new HashSet<QuestionType>();
+			Questions = new HashSet<Question>();
+		}
+    }
+}

Entities/Contracts/Submission.cs

@@ -17,47 +17,70 @@ namespace Entities.Contracts
 		public Guid Id { get; set; }
 
 		[Required]
-		[Column("assignment_id")]
-		[ForeignKey("Assignment")]
-		public Guid AssignmentId { get; set; }
+		[Column("exam_id")]
+		public Guid ExamId { get; set; }
+		[ForeignKey(nameof(ExamId))]
+		public virtual Exam Exam { get; set; }
 
 		[Required]
 		[Column("student_id")]
-		[ForeignKey("Student")]
 		public Guid StudentId { get; set; }
+		[ForeignKey(nameof(StudentId))]
+		public virtual User Student { get; set; }
+
+		[Column("graded_by")]
+		public Guid? GraderId { get; set; }
+		[ForeignKey(nameof(GraderId))]
+		public virtual User Grader { get; set; }
+
+		[Column("class_id")]
+		public Guid ClassId { get; set; }
+		[ForeignKey(nameof(ClassId))]
+		public virtual Class Class { get; set; }
 
 		[Required]
 		[Column("attempt_number")]
-		public Guid AttemptNumber { get; set; }
+		public byte AttemptNumber { get; set; }  // 第几次提交
 
 		[Column("submission_time")]
 		public DateTime SubmissionTime { get; set; }
 
 		[Column("overall_grade")]
-		public float? OverallGrade { get; set; }
+		public float OverallGrade { get; set; } = 0;
 
 		[Column("overall_feedback")]
-		public string OverallFeedback { get; set; }
-
-		[Column("graded_by")]
-		[ForeignKey("Grader")]
-		public Guid? GradedBy { get; set; }
+		public string? OverallFeedback { get; set; }
 
 		[Column("graded_at")]
 		public DateTime? GradedAt { get; set; }
 
-		[Column("deleted")]
-		public bool IsDeleted { get; set; }
-
 		[Required]
 		[Column("status")]
 		public SubmissionStatus Status { get; set; }
 
+		[Column("deleted")]
+		public bool IsDeleted { get; set; }
 		// Navigation Properties
-		public Assignment Assignment { get; set; }
-		public User Student { get; set; }
-		public User Grader { get; set; }
-		public ICollection<SubmissionDetail> SubmissionDetails { get; set; }
+
+		[NotMapped]
+		public int ErrorCount => SubmissionDetails.Where(sd => sd?.IsCorrect == false && sd.IsCorrect != null).Count();
+
+		[NotMapped]
+		public Dictionary<string, int> ErrorQuestionTypeDistribution => SubmissionDetails
+			.Where(sd => sd?.IsCorrect == false)
+			.GroupBy(sd => sd.ExamQuestion.Type.Name)
+			.ToDictionary(g => g.Key, g => g.Count());
+
+		[NotMapped]
+		public Dictionary<string, int> ErrorQuestionLessonDistribution => SubmissionDetails
+			.Where(sd => sd?.IsCorrect == false && sd.ExamQuestion.Question?.Lesson != null)
+			.GroupBy(sd => sd.ExamQuestion.Question.Lesson.Title)
+			.ToDictionary(g => g.Key, g => g.Count());
+
+
+
+		[InverseProperty(nameof(SubmissionDetail.Submission))]
+		public virtual ICollection<SubmissionDetail> SubmissionDetails { get; set; }
 
 		public Submission()
 		{
@@ -66,14 +89,4 @@ namespace Entities.Contracts
 		}
 	}
 
-	public enum SubmissionStatus
-	{
-		Pending,        // 待提交/未开始
-		Submitted,      // 已提交
-		Graded,         // 已批改
-		Resubmission,   // 待重新提交 (如果允许)
-		Late,           // 迟交
-		Draft,          // 草稿
-						// ... 添加你需要的其他状态
-	}
 }

Entities/Contracts/SubmissionDetail.cs

@@ -20,28 +20,32 @@ namespace Entities.Contracts
 		[Column("submission_id")]
 		[ForeignKey("Submission")]
 		public Guid SubmissionId { get; set; }
+		[ForeignKey(nameof(SubmissionId))]
+		public virtual Submission Submission { get; set; }
 
 		[Required]
 		[Column("student_id")]
-		[ForeignKey("User")]
 		public Guid StudentId { get; set; }
+		[ForeignKey(nameof(StudentId))]
+		public virtual User Student { get; set; }
 
 		[Required]
-		[Column("assignment_question_id")]
-		[ForeignKey("AssignmentQuestion")]
-		public Guid AssignmentQuestionId { get; set; }
+		[Column("exam_question_id")]
+		public Guid ExamQuestionId { get; set; }
+		[ForeignKey(nameof(ExamQuestionId))]
+		public virtual ExamQuestion ExamQuestion { get; set; }
 
 		[Column("student_answer")]
-		public string StudentAnswer { get; set; }
+		public string? StudentAnswer { get; set; }
 
 		[Column("is_correct")]
 		public bool? IsCorrect { get; set; }
 
 		[Column("points_awarded")]
-		public float? PointsAwarded { get; set; }
+		public float? PointsAwarded { get; set; } // 得分
 
 		[Column("teacher_feedback")]
-		public string TeacherFeedback { get; set; }
+		public string? TeacherFeedback { get; set; }
 
 		[Column("created_at")]
 		public DateTime CreatedAt { get; set; }
@@ -52,9 +56,6 @@ namespace Entities.Contracts
 		[Column("deleted")]
 		public bool IsDeleted { get; set; }
 
-		public Submission Submission { get; set; }
-		public User User { get; set; }
-		public AssignmentQuestion AssignmentQuestion { get; set; }
 
 		public SubmissionDetail()
 		{

Entities/Contracts/Textbook/KeyPoint.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.Contracts
+{
+	[Table("key_point")]
+	public class KeyPoint
+	{
+		[Key]
+		public Guid Id { get; set; }
+
+		[StringLength(255)]
+		public string Key { get; set; } = string.Empty;
+
+		
+
+		[Required]
+		public Guid LessonID { get; set; }
+		[ForeignKey(nameof(LessonID))]
+		public virtual Lesson Lesson { get; set; }
+
+
+		public virtual ICollection<Question> Questions { get; set; }
+
+		public KeyPoint()
+		{
+			Id = Guid.NewGuid();
+			Questions = new HashSet<Question>();
+		}
+	}
+}

Entities/Contracts/Textbook/Lesson.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.Contracts
+{
+	[Table("lesson")]
+	public class Lesson
+	{
+		[Key]
+		public Guid Id { get; set; }
+
+		[StringLength(255)]
+		public string Title { get; set; } = string.Empty;
+
+		public string Description { get; set; } = string.Empty;
+
+		[Required]
+		public Guid TextbookID { get; set; }
+		[ForeignKey(nameof(TextbookID))]
+		public virtual Textbook Textbook { get; set; }
+
+
+
+		[InverseProperty(nameof(KeyPoint.Lesson))]
+		public virtual ICollection<KeyPoint>? KeyPoints { get; set; }
+
+		[InverseProperty(nameof(Question.Lesson))]
+		public virtual ICollection<Question>? Questions { get; set; }
+
+		[InverseProperty(nameof(LessonQuestion.Lesson))]
+		public virtual ICollection<LessonQuestion>? LessonQuestions { get; set; } 
+
+
+
+		public Lesson()
+		{
+			Id = Guid.NewGuid();
+			KeyPoints = new HashSet<KeyPoint>();
+			Questions = new HashSet<Question>();	
+			LessonQuestions = new HashSet<LessonQuestion>();	
+		}
+	}
+}

Entities/Contracts/Textbook/LessonQuestion.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.Contracts
+{
+	[Table("lesson_question")]
+	public class LessonQuestion
+	{
+		[Key]
+		public Guid Id { get; set; }
+
+		[MaxLength(65535)]
+		public string Question { get; set; }
+
+		[Required]
+		public Guid LessonID { get; set; }
+		[ForeignKey(nameof(LessonID))]	
+		public virtual Lesson Lesson { get; set; }
+
+
+		public LessonQuestion()
+		{
+			Id = Guid.NewGuid();
+		}
+
+	}
+}

Entities/Contracts/Textbook/Textbook.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.Contracts
+{
+	[Table("textbook")]
+	public class Textbook
+	{
+		[Key]
+		public Guid Id { get; set; }
+
+		public GradeEnum Grade { get; set; } = GradeEnum.Unknown;
+
+		public string Title { get; set; } = string.Empty;
+
+		public Publisher Publisher { get; set; } = Publisher.部编版;
+
+		public SubjectAreaEnum SubjectArea { get; set; } = SubjectAreaEnum.Unknown;
+
+		[InverseProperty(nameof(Lesson.Textbook))]
+		public virtual ICollection<Lesson> Lessons { get; set; }
+
+		public Textbook()
+		{
+			Id = Guid.NewGuid();
+			Lessons = new HashSet<Lesson>();
+		}
+	}
+
+}

Entities/Contracts/User.cs

@@ -3,45 +3,57 @@ using System.ComponentModel.DataAnnotations.Schema;
 
 namespace Entities.Contracts
 {
-	public enum UserRoles 
-	{
-		Student,
-		Teacher,
-		Administrator
-	}
 
 	public class User : IdentityUser<Guid>
 	{
 		public string? RefreshToken { get; set; }
+
 		public DateTime? RefreshTokenExpiryTime { get; set; }
-		public string? Address { get; set; }	
+		
+		public string? HomeAddress { get; set; }
+
 		public string? DisplayName { get; set; }
 
+		public UserRoles? Role { get; set; } 
+
+		public Guid? TeachSubjectId { get; set; }
+		[ForeignKey(nameof(TeachSubjectId))]
+		public virtual Subject? TeachSubject { get; set; }
 
 		[Column("deleted")]
 		public bool IsDeleted { get; set; }
 		
-		public ICollection<ClassTeacher> TaughtClassesLink { get; set; }
-		public ICollection<ClassStudent> EnrolledClassesLink { get; set; }
+		[InverseProperty(nameof(ClassUser.User))]
+		public virtual ICollection<ClassUser> UserInjoinedClass { get; set; }
+
+		//[InverseProperty(nameof(Question.Creator))]
+		//public virtual ICollection<Question> CreatedQuestions { get; set; }
+
+		[InverseProperty(nameof(Exam.Creator))]
+		public virtual ICollection<Exam> CreatedExams { get; set; }
+
+		[InverseProperty(nameof(SubmissionDetail.Student))]
+		public virtual ICollection<SubmissionDetail> SubmissionDetails { get; set; }
+
+		[InverseProperty(nameof(Submission.Student))]
+		public virtual ICollection<Submission> StudentSubmissions { get; set; }
+
+		[InverseProperty(nameof(Submission.Grader))]
+		public virtual ICollection<Submission> GradedSubmissions { get; set; }
 
-		public ICollection<Question> CreatedQuestions { get; set; }
-		public ICollection<Assignment> CreatedAssignments { get; set; }
 
-		public ICollection<SubmissionDetail> SubmissionDetails { get; set; }
-		public ICollection<Submission> SubmissionsAsStudent { get; set; }
-		public ICollection<Submission> GradedSubmissions { get; set; }
 
 		public User()
 		{
 			Id = Guid.NewGuid();
 			SecurityStamp = Guid.NewGuid().ToString();
 
-			CreatedQuestions = new HashSet<Question>();
-			TaughtClassesLink = new HashSet<ClassTeacher>();
-			EnrolledClassesLink = new HashSet<ClassStudent>();
-			CreatedAssignments = new HashSet<Assignment>();
+			//CreatedQuestions = new HashSet<Question>();
+			UserInjoinedClass = new HashSet<ClassUser>();
+			CreatedExams = new HashSet<Exam>();
 			GradedSubmissions = new HashSet<Submission>();
-			SubmissionsAsStudent = new HashSet<Submission>();
+			StudentSubmissions = new HashSet<Submission>();
+			SubmissionDetails = new HashSet<SubmissionDetail>();
 		}
 	}
 }

Entities/DTO/ApiResponse.cs

@@ -1,4 +1,4 @@
-namespace TechHelper.Services
+namespace Entities.DTO
 {
 	public class ApiResponse
 	{

Entities/DTO/Authentication/UserForAuthenticationDto.cs

@@ -2,7 +2,7 @@
 
 namespace Entities.DTO
 {
-    public class UserForAuthenticationDto
+	public class UserForAuthenticationDto
 	{
 		[Required(ErrorMessage = "Email is required")]
 		public string? Email { get; set; }

Entities/DTO/Class/ClassCreateDto.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO.Class
+{
+	public record ClassCreateDto
+	{
+		public CreateGradeDto Grade { get; init; }
+
+		[Required(ErrorMessage = "年级名称是必填项。")]
+		[StringLength(20, ErrorMessage = "年级名称不能超过 20 个字符。")]
+		public string ClassName { get; init; }
+
+		[Required(ErrorMessage = "年级级别是必填项。")]
+		public byte Index { get; init; }
+	}
+}

Entities/DTO/Class/ClassDto.cs

@@ -0,0 +1,25 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class ClassDto
+    {
+        public Guid Id { get; set; }
+
+        public Guid GradeId { get; set; }
+
+        public GradeDto Grade { get; set; }
+
+        [Required(ErrorMessage = "班级名称是必填项。")]
+        [StringLength(30, ErrorMessage = "班级名称不能超过 30 个字符。")]
+        public string ClassName { get; set; }
+
+        public byte Index { get; set; }
+
+        public Guid? HeadTeacherId { get; set; }
+
+        public DateTime CreatedAt { get; set; }
+        public DateTime UpdatedAt { get; set; }
+    }
+}

Entities/DTO/Class/ClassResponseDto.cs

@@ -0,0 +1,22 @@
+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+
+namespace Entities.DTO
+{
+    public class ClassResponseDto
+    {
+        public Guid Id { get; set; }
+        public Guid GradeId { get; set; }
+        public string GradeName { get; set; }
+        public string ClassName { get; set; }
+        public Guid? HeadTeacherId { get; set; }
+        public string HeadTeacherName { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime UpdatedAt { get; set; }
+        public bool IsDeleted { get; set; }
+
+        // Navigation properties for response
+        public ICollection<ClassUserDto> ClassStudents { get; set; }
+    }
+}

Entities/DTO/Class/ClassUserDto.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace Entities.DTO
+{
+    public class ClassUserDto
+    {
+        public Guid StudentId { get; set; }
+        public string? Email { get; set; }
+        public string? DisplayName { get; set; }
+        public string? PhoneNumber { get; set; }
+        public string? Address { get; set; }
+        public bool TwoFactorEnabled { get; set; }
+        public bool EmailConfirmed { get; set; }
+    }
+}

Entities/DTO/Class/ClassValidDto.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public record ClassValidDto(string SchoolName, byte Grade, byte Class);
+}

Entities/DTO/Class/CreateClassDto.cs

@@ -0,0 +1,19 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class CreateClassDto
+    {
+        [Required(ErrorMessage = "年级ID是必填项。")]
+        public Guid GradeId { get; set; }
+
+        [Required(ErrorMessage = "班级名称是必填项。")]
+        [StringLength(30, ErrorMessage = "班级名称不能超过 30 个字符。")]
+        public string ClassName { get; set; }
+
+        public byte Index { get; set; }
+
+        public Guid? HeadTeacherId { get; set; }
+    }
+}

Entities/DTO/Class/RegisterUserToClassDto.cs

@@ -0,0 +1,18 @@
+using Entities.Contracts;
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class RegisterUserToClassDto
+    {
+
+        public Guid UserId { get; set; }
+
+        public Guid ClassId { get; set; }
+
+        public UserRoles Role { get; set; } = UserRoles.Student; 
+
+        public Guid? SubjectArea { get; set; }
+    }
+}

Entities/DTO/Class/UpdateClassDto.cs

@@ -0,0 +1,20 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class UpdateClassDto
+    {
+        [Required(ErrorMessage = "班级ID是必填项。")]
+        public Guid ClassId { get; set; }
+
+        [Required(ErrorMessage = "年级ID是必填项。")]
+        public Guid GradeId { get; set; }
+
+        [Required(ErrorMessage = "班级名称是必填项。")]
+        [StringLength(30, ErrorMessage = "班级名称不能超过 30 个字符。")]
+        public string ClassName { get; set; }
+
+        public Guid? HeadTeacherId { get; set; }
+    }
+}

Entities/DTO/ClassDto.cs

@@ -1,21 +0,0 @@
-using System.ComponentModel.DataAnnotations;
-
-namespace Entities.DTO
-{
-	public class ClassDto
-	{
-		public byte Class { get; set; }
-
-		[StringLength(50, ErrorMessage = "班级名称不能超过 50 个字符。")]
-		public string Name { get; set; }
-
-		[Required(ErrorMessage = "年级是必填项。")]
-		[Range(1, 12, ErrorMessage = "年级编号必须在 1 到 12 之间。")] 
-		public byte Grade { get; set; }
-
-		public string Description { get; set; } = "HELLO WORLD";
-
-
-		public int? HeadTeacherId { get; set; }
-	}
-}

Entities/DTO/Common/QueryParameterDto.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class QueryParameterDto
+	{
+		public int PageIndex { get; set; }
+		public int PageSize { get; set; }
+		public string Search { get; set; }
+	}
+}

Entities/DTO/Common/TypeCommonDto.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public record TypeCommonDto(Guid Id, string Name);
+}

Entities/DTO/Common/TypeCommonRequest.cs

@@ -0,0 +1,11 @@
+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public record TypeCommonRequest(TypeNameType Type, Guid? SubjectId);
+}

Entities/DTO/Exam/AssigExamToStudentsDto.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class AssigExamToStudentsDto
+	{
+		public Guid CreaterId { get; set; }
+		public Guid ExamId { get; set; }
+		public Guid ClassId { get; set; }
+		public List<Guid> StudentIds { get; set; } = new List<Guid>();
+	}
+
+	public record AssigExamToClassDto(Guid examId, Guid classId);
+}

Entities/DTO/Exam/AssignmentClassDto.cs

@@ -0,0 +1,23 @@
+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Serialization;
+
+namespace Entities.DTO
+{
+
+
+	public class AssignmentClassDto
+	{
+		public ExamDto Assignment { get; set; }
+		public ClassDto ClassId { get; set; }
+		public DateTime AssignedAt { get; set; }
+	}
+
+
+
+
+}

Entities/DTO/Exam/CreateExamDto.cs

@@ -0,0 +1,35 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class CreateExamDto
+    {
+        [Required(ErrorMessage = "考试标题是必填项。")]
+        [StringLength(255, ErrorMessage = "考试标题不能超过 255 个字符。")]
+        public string Title { get; set; }
+
+        public string Description { get; set; }
+
+        [Required(ErrorMessage = "科目ID是必填项。")]
+        public Guid SubjectId { get; set; }
+
+        [Required(ErrorMessage = "考试结构ID是必填项。")]
+        public Guid ExamStructId { get; set; }
+
+        [Required(ErrorMessage = "考试类型ID是必填项。")]
+        public Guid ExamTypeId { get; set; }
+
+        [Required(ErrorMessage = "创建者ID是必填项。")]
+        public Guid CreatorId { get; set; }
+
+        [Required(ErrorMessage = "截止日期是必填项。")]
+        public DateTime DueDate { get; set; }
+
+        public byte TotalQuestions { get; set; }
+
+        public float Score { get; set; }
+
+        public string Name { get; set; }
+    }
+}

Entities/DTO/Exam/ExamDto.cs

@@ -0,0 +1,44 @@
+using Entities.Contracts;
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class ExamDto
+    {
+        public Guid Id { get; set; } = Guid.NewGuid();
+
+        [Required(ErrorMessage = "考试标题是必填项。")]
+        [StringLength(255, ErrorMessage = "考试标题不能超过 255 个字符。")]
+        public string Title { get; set; }
+
+        public string Description { get; set; }
+
+		public byte TotalQuestions { get; set; }
+
+		public float Score { get; set; }
+
+		public string Name { get; set; }
+
+
+
+
+
+		[Required(ErrorMessage = "截止日期是必填项。")]
+		public DateTime DueDate { get; set; }
+
+		public Guid SubjectId { get; set; }
+
+        public Guid ExamTypeId { get; set; }
+
+        public Guid CreatorId { get; set; }
+
+		//public Guid ExamStructId { get; set; } 
+
+
+		public ExamQuestionDto ExamStruct { get; set; } = new ExamQuestionDto();
+
+        public DateTime CreatedAt { get; set; }
+        public DateTime UpdatedAt { get; set; }
+    }
+}

Entities/DTO/Exam/ExamListDto.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public record ExamListDto(Guid Id, string Name);
+}

Entities/DTO/Exam/ExamQuestionDto.cs

@@ -0,0 +1,33 @@
+using Entities.Contracts;
+
+namespace Entities.DTO
+{
+	public class ExamQuestionDto
+	{
+		public Guid Id { get; set; } = Guid.NewGuid();
+		
+		public string Title { get; set; } = string.Empty;
+
+		public float Score { get; set; } = 0;
+
+		public byte Index { get; set; } = 0;
+
+		public string Sequence { get; set; } = string.Empty;
+
+
+		public Guid QuestionTypeId { get; set; } 
+		
+		//public Guid? QuestionId { get; set; }
+
+		//public Guid? ParentExamQuestionId { get; set; }
+
+		public QuestionDto? Question { get; set; } 
+
+		//public ExamQuestionDto? ParentExamQuestion { get; set; }
+
+		public ICollection<ExamQuestionDto> ChildExamQuestions { get; set; } = new List<ExamQuestionDto>();
+
+		// public Layout Layout { get; set; } = Layout.horizontal;
+		// public QuestionContextDto? Description { get; set; }
+	}
+}

Entities/DTO/Exam/ExamResponseDto.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+
+namespace Entities.DTO
+{
+    public class ExamResponseDto
+    {
+        public Guid Id { get; set; }
+        public string Title { get; set; }
+        public string Description { get; set; }
+        public Guid SubjectId { get; set; }
+        public string SubjectName { get; set; }
+        public Guid ExamStructId { get; set; }
+        public string ExamStructName { get; set; }
+        public Guid ExamTypeId { get; set; }
+        public string ExamTypeName { get; set; }
+        public Guid CreatorId { get; set; }
+        public string CreatorName { get; set; }
+        public DateTime DueDate { get; set; }
+        public byte TotalQuestions { get; set; }
+        public float Score { get; set; }
+        public string Name { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime UpdatedAt { get; set; }
+        public bool IsDeleted { get; set; }
+
+        // Navigation properties for response
+        public int AttachmentCount { get; set; }
+        public int SubmissionCount { get; set; }
+        public List<string> AttachmentNames { get; set; } = new List<string>();
+        public List<string> StudentNames { get; set; } = new List<string>();
+        public List<DateTime> SubmissionTimes { get; set; } = new List<DateTime>();
+    }
+}

Entities/DTO/Exam/UpdateExamDto.cs

@@ -0,0 +1,38 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class UpdateExamDto
+    {
+        [Required(ErrorMessage = "考试ID是必填项。")]
+        public Guid Id { get; set; }
+
+        [Required(ErrorMessage = "考试标题是必填项。")]
+        [StringLength(255, ErrorMessage = "考试标题不能超过 255 个字符。")]
+        public string Title { get; set; }
+
+        public string Description { get; set; }
+
+        [Required(ErrorMessage = "科目ID是必填项。")]
+        public Guid SubjectId { get; set; }
+
+        [Required(ErrorMessage = "考试结构ID是必填项。")]
+        public Guid ExamStructId { get; set; }
+
+        [Required(ErrorMessage = "考试类型ID是必填项。")]
+        public Guid ExamTypeId { get; set; }
+
+        [Required(ErrorMessage = "创建者ID是必填项。")]
+        public Guid CreatorId { get; set; }
+
+        [Required(ErrorMessage = "截止日期是必填项。")]
+        public DateTime DueDate { get; set; }
+
+        public byte TotalQuestions { get; set; }
+
+        public float Score { get; set; }
+
+        public string Name { get; set; }
+    }
+}

Entities/DTO/ExamDto.cs

@@ -1,81 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Xml.Serialization;
-
-namespace Entities.DTO
-{
-	public class ExamDto
-	{
-		public Guid? AssignmentId { get; set; }
-		public string CreaterEmail { get; set; }	
-		public string AssignmentTitle { get; set; } = string.Empty;
-		public string Description { get; set; }
-		public string SubjectArea { get; set; }
-		public QuestionGroupDto QuestionGroups { get; set; } = new QuestionGroupDto();
-	}
-
-	public class QuestionGroupDto
-	{
-		public byte Index { get; set; } 
-
-		public string? Title { get; set; }
-
-		public float Score { get; set; }
-
-		public string? Descript { get; set; } 
-		public List<SubQuestionDto> SubQuestions { get; set; } = new List<SubQuestionDto>();
-		public List<QuestionGroupDto> SubQuestionGroups { get; set; } = new List<QuestionGroupDto>();
-
-		// 标记是否是一个具有上下文的单独问题
-		public bool ValidQuestionGroup { get; set; } = false;
-	}
-
-	public class SubQuestionDto
-	{
-
-		public byte Index { get; set; } 
-
-		public string? Stem { get; set; }
-
-		public float Score { get; set; }
-
-		public List<OptionDto> Options { get; set; } = new List<OptionDto>();
-
-		public string? SampleAnswer { get; set; } 
-
-		public string? QuestionType { get; set; } 
-		public string? DifficultyLevel { get; set; }
-
-		// 标记是否是一个独立的问题
-		public bool ValidQuestion { get; set; } = false;
-
-	}
-
-	public class OptionDto
-	{
-		public string? Value { get; set; } = string.Empty;
-	}
-
-
-	public static class ExamDtoExtension
-	{
-		public static void Convert(this ExamDto examDto)
-		{
-			var qg = examDto.QuestionGroups;
-
-		}
-
-		public static void Convert(this QuestionGroupDto examDto)
-		{
-			if(examDto.ValidQuestionGroup)
-			{
-
-			}
-
-		}
-	}
-
-}

Entities/DTO/ExamType/CreateExamTypeDto.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class CreateExamTypeDto
+    {
+        [Required(ErrorMessage = "考试类型名称是必填项。")]
+        [StringLength(20, ErrorMessage = "考试类型名称不能超过 20 个字符。")]
+        public string ExamTypeName { get; set; }
+
+        public string Description { get; set; }
+    }
+}

Entities/DTO/ExamType/ExamTypeDto.cs

@@ -0,0 +1,16 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class ExamTypeDto
+    {
+        public Guid Id { get; set; }
+
+        [Required(ErrorMessage = "考试类型名称是必填项。")]
+        [StringLength(20, ErrorMessage = "考试类型名称不能超过 20 个字符。")]
+        public string Name { get; set; }
+
+        public string Description { get; set; }
+    }
+}

Entities/DTO/ExamType/ExamTypeResponseDto.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+
+namespace Entities.DTO
+{
+    public class ExamTypeResponseDto
+    {
+        public Guid ExamId { get; set; }
+        public string ExamTypeName { get; set; }
+        public string Description { get; set; }
+
+        // Navigation properties for response
+        public int ExamCount { get; set; }
+        public List<string> ExamTitles { get; set; } = new List<string>();
+    }
+}

Entities/DTO/ExamType/UpdateExamTypeDto.cs

@@ -0,0 +1,17 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class UpdateExamTypeDto
+    {
+        [Required(ErrorMessage = "考试类型ID是必填项。")]
+        public Guid ExamTypeId { get; set; }
+
+        [Required(ErrorMessage = "考试类型名称是必填项。")]
+        [StringLength(20, ErrorMessage = "考试类型名称不能超过 20 个字符。")]
+        public string ExamTypeName { get; set; }
+
+        public string Description { get; set; }
+    }
+}

Entities/DTO/Grade/CreateGradeDto.cs

@@ -0,0 +1,17 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public record CreateGradeDto
+    {
+        public Guid SchoolId { get; init; }
+
+        [Required(ErrorMessage = "年级名称是必填项。")]
+        [StringLength(20, ErrorMessage = "年级名称不能超过 20 个字符。")]
+        public string GradeName { get; init; }
+
+        [Required(ErrorMessage = "年级级别是必填项。")]
+        public byte GradeLevel { get; init; }
+    }
+}

Entities/DTO/Grade/GradeDto.cs

@@ -0,0 +1,19 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class GradeDto
+    {
+        public Guid Id { get; set; }
+
+        public Guid SchoolId { get; set; }
+
+        [Required(ErrorMessage = "年级名称是必填项。")]
+        [StringLength(20, ErrorMessage = "年级名称不能超过 20 个字符。")]
+        public string GradeName { get; set; }
+
+        [Required(ErrorMessage = "年级级别是必填项。")]
+        public byte GradeLevel { get; set; }
+    }
+}

Entities/DTO/Grade/GradeResponseDto.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+
+namespace Entities.DTO
+{
+    public class GradeResponseDto
+    {
+        public int Id { get; set; }
+        public int SchoolId { get; set; }
+        public string SchoolName { get; set; }
+        public string GradeName { get; set; }
+        public int GradeLevel { get; set; }
+
+        // Navigation properties for response
+        public ICollection<ClassDto> Responses { get; set; }
+    }
+}

Entities/DTO/Grade/UpdateGradeDto.cs

@@ -0,0 +1,21 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class UpdateGradeDto
+    {
+        [Required(ErrorMessage = "年级ID是必填项。")]
+        public Guid Id { get; set; }
+
+        [Required(ErrorMessage = "学校ID是必填项。")]
+        public Guid SchoolId { get; set; }
+
+        [Required(ErrorMessage = "年级名称是必填项。")]
+        [StringLength(20, ErrorMessage = "年级名称不能超过 20 个字符。")]
+        public string GradeName { get; set; }
+
+        [Required(ErrorMessage = "年级级别是必填项。")]
+        public byte GradeLevel { get; set; }
+    }
+}

Entities/DTO/KeyPoint/CreateKeyPointDto.cs

@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public record CreateKeyPointDto
+    {
+        [Required]
+        [StringLength(255)]
+        public string Key { get; init; } = string.Empty;
+
+        [Required]
+        public Guid LessonID { get; init; }
+    }
+}

Entities/DTO/KeyPoint/KeyPointDto.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public record KeyPointDto(Guid Id, string Key, Guid LessonId);
+}

Entities/DTO/KeyPoint/KeyPointResponseDto.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace Entities.DTO
+{
+    public record KeyPointResponseDto
+    {
+        public Guid Id { get; init; }
+        public string Key { get; init; } = string.Empty;
+        public Guid LessonID { get; init; }
+        public DateTime CreatedAt { get; init; }
+        public DateTime? UpdatedAt { get; init; }
+    }
+}

Entities/DTO/KeyPoint/UpdateKeyPointDto.cs

@@ -0,0 +1,17 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public record UpdateKeyPointDto
+    {
+        [Required]
+        public Guid Id { get; init; }
+
+        [Required]
+        [StringLength(255)]
+        public string Key { get; init; } = string.Empty;
+
+        [Required]
+        public Guid LessonID { get; init; }
+    }
+}

Entities/DTO/Lesson/CreateLessonDto.cs

@@ -0,0 +1,17 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class CreateLessonDto
+    {
+        [Required(ErrorMessage = "课程标题是必填项")]
+        [StringLength(255, ErrorMessage = "课程标题长度不能超过255个字符")]
+        public string Title { get; set; } = string.Empty;
+
+        [StringLength(1000, ErrorMessage = "课程描述长度不能超过1000个字符")]
+        public string Description { get; set; } = string.Empty;
+
+        [Required(ErrorMessage = "教材ID是必填项")]
+        public Guid TextbookID { get; set; }
+    }
+}

Entities/DTO/Lesson/LessonDto.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public record LessonDto(Guid Id, string Title, string Description, Guid TextBookId);
+}

Entities/DTO/Lesson/LessonResponseDto.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Entities.DTO
+{
+    public class LessonResponseDto
+    {
+        public Guid Id { get; set; }
+        public string Title { get; set; } = string.Empty;
+        public string Description { get; set; } = string.Empty;
+        public Guid TextbookID { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime? UpdatedAt { get; set; }
+    }
+}

Entities/DTO/Lesson/UpdateLessonDto.cs

@@ -0,0 +1,20 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class UpdateLessonDto
+    {
+        [Required(ErrorMessage = "课程ID是必填项")]
+        public Guid Id { get; set; }
+
+        [Required(ErrorMessage = "课程标题是必填项")]
+        [StringLength(255, ErrorMessage = "课程标题长度不能超过255个字符")]
+        public string Title { get; set; } = string.Empty;
+
+        [StringLength(1000, ErrorMessage = "课程描述长度不能超过1000个字符")]
+        public string Description { get; set; } = string.Empty;
+
+        [Required(ErrorMessage = "教材ID是必填项")]
+        public Guid TextbookID { get; set; }
+    }
+}

Entities/DTO/Question/QuestionDto.cs

@@ -0,0 +1,36 @@
+using Entities.Contracts;
+
+namespace Entities.DTO
+{
+	public class QuestionDto
+	{
+		public Guid Id { get; set; } = Guid.NewGuid();
+
+		public string Title { get; set; } = string.Empty;
+
+		public string? Answer { get; set; } = string.Empty;
+
+		public string? Options { get; set; }
+
+		//public DifficultyLevel DifficultyLevel { get; set; } = DifficultyLevel.easy;
+
+
+
+		public Guid QuestioTypeId { get; set; } 
+
+		public Guid SubjectId { get; set; }
+
+		//public Guid CreatorId { get; set; }
+
+		public Guid? KeyPointId { get; set; }
+
+		public Guid? LessonId { get; set; }
+
+
+
+		public DateTime CreatedAt { get; set; }
+
+		public DateTime UpdatedAt { get; set; } = DateTime.Now;
+
+	}
+}

Entities/DTO/QuestionType/CreateQuestionTypeDto.cs

@@ -0,0 +1,19 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class CreateQuestionTypeDto
+    {
+        [Required(ErrorMessage = "题型名称是必填项。")]
+        [StringLength(20, ErrorMessage = "题型名称不能超过 20 个字符。")]
+        public string TypeName { get; set; }
+
+        [Required(ErrorMessage = "科目ID是必填项。")]
+        public Guid SubjectId { get; set; }
+
+        public string Description { get; set; }
+
+        [StringLength(20, ErrorMessage = "评分规则不能超过 20 个字符。")]
+        public string ScoreRule { get; set; }
+    }
+}

Entities/DTO/QuestionType/QuestionTypeDto.cs

@@ -0,0 +1,22 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class QuestionTypeDto
+    {
+        public Guid Id { get; set; }
+
+        [Required(ErrorMessage = "题型名称是必填项。")]
+        [StringLength(20, ErrorMessage = "题型名称不能超过 20 个字符。")]
+        public string Name { get; set; }
+
+        [Required(ErrorMessage = "科目ID是必填项。")]
+        public Guid SubjectId { get; set; }
+
+        public string Description { get; set; }
+
+        [StringLength(20, ErrorMessage = "评分规则不能超过 20 个字符。")]
+        public string ScoreRule { get; set; }
+    }
+}

Entities/DTO/QuestionType/QuestionTypeResponseDto.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+
+namespace Entities.DTO
+{
+    public class QuestionTypeResponseDto
+    {
+        public Guid TypeId { get; set; }
+        public string TypeName { get; set; }
+        public Guid SubjectId { get; set; }
+        public string SubjectName { get; set; }
+        public string Description { get; set; }
+        public string ScoreRule { get; set; }
+
+        // Navigation properties for response
+        public int QuestionCount { get; set; }
+        public List<string> QuestionTitles { get; set; } = new List<string>();
+    }
+}

Entities/DTO/QuestionType/UpdateQuestionTypeDto.cs

@@ -0,0 +1,23 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class UpdateQuestionTypeDto
+    {
+        [Required(ErrorMessage = "题型ID是必填项。")]
+        public Guid TypeId { get; set; }
+
+        [Required(ErrorMessage = "题型名称是必填项。")]
+        [StringLength(20, ErrorMessage = "题型名称不能超过 20 个字符。")]
+        public string TypeName { get; set; }
+
+        [Required(ErrorMessage = "科目ID是必填项。")]
+        public Guid SubjectId { get; set; }
+
+        public string Description { get; set; }
+
+        [StringLength(20, ErrorMessage = "评分规则不能超过 20 个字符。")]
+        public string ScoreRule { get; set; }
+    }
+}

Entities/DTO/School/CreateSchoolDto.cs

@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class CreateSchoolDto
+    {
+        [Required(ErrorMessage = "学校名称是必填项。")]
+        [StringLength(50, ErrorMessage = "学校名称不能超过 50 个字符。")]
+        public string SchoolName { get; set; }
+
+        [StringLength(100, ErrorMessage = "地址不能超过 100 个字符。")]
+        public string Address { get; set; }
+    }
+}

Entities/DTO/School/SchoolDto.cs

@@ -0,0 +1,19 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class SchoolDto
+    {
+        public Guid Id { get; set; }
+
+        [Required(ErrorMessage = "学校名称是必填项。")]
+        [StringLength(50, ErrorMessage = "学校名称不能超过 50 个字符。")]
+        public string SchoolName { get; set; }
+
+        [StringLength(100, ErrorMessage = "地址不能超过 100 个字符。")]
+        public string Address { get; set; }
+
+        public DateTime CreateTime { get; set; }
+    }
+}

Entities/DTO/School/SchoolResponseDto.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+
+namespace Entities.DTO
+{
+    public class SchoolResponseDto
+    {
+        public int SchoolId { get; set; }
+        public string SchoolName { get; set; }
+        public string Address { get; set; }
+        public DateTime CreateTime { get; set; }
+
+        // Navigation properties for response
+        public ICollection<GradeDto> Grades { get; set; }
+    }
+}

Entities/DTO/School/UpdateSchoolDto.cs

@@ -0,0 +1,18 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class UpdateSchoolDto
+    {
+        [Required(ErrorMessage = "学校ID是必填项。")]
+        public Guid SchoolId { get; set; }
+
+        [Required(ErrorMessage = "学校名称是必填项。")]
+        [StringLength(50, ErrorMessage = "学校名称不能超过 50 个字符。")]
+        public string SchoolName { get; set; }
+
+        [StringLength(100, ErrorMessage = "地址不能超过 100 个字符。")]
+        public string Address { get; set; }
+    }
+}

Entities/DTO/Subject/CreateSubjectDto.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class CreateSubjectDto
+    {
+        [Required(ErrorMessage = "科目名称是必填项。")]
+        [StringLength(20, ErrorMessage = "科目名称不能超过 20 个字符。")]
+        public string SubjectName { get; set; }
+
+        public string Description { get; set; }
+    }
+}

Entities/DTO/Subject/SubjectDto.cs

@@ -0,0 +1,16 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class SubjectDto
+    {
+        public Guid Id { get; set; }
+
+        [Required(ErrorMessage = "科目名称是必填项。")]
+        [StringLength(20, ErrorMessage = "科目名称不能超过 20 个字符。")]
+        public string Name { get; set; }
+
+        public string Description { get; set; }
+    }
+}

Entities/DTO/Subject/SubjectResponseDto.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+
+namespace Entities.DTO
+{
+    public class SubjectResponseDto
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; }
+        public string Description { get; set; }
+
+        // Navigation properties for response
+        public int QuestionTypeCount { get; set; }
+        public int QuestionCount { get; set; }
+        public int TeacherCount { get; set; }
+        public List<string> QuestionTypeNames { get; set; } = new List<string>();
+        public List<string> TeacherNames { get; set; } = new List<string>();
+    }
+}

Entities/DTO/Subject/UpdateSubjectDto.cs

@@ -0,0 +1,17 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class UpdateSubjectDto
+    {
+        [Required(ErrorMessage = "科目ID是必填项。")]
+        public Guid SubjectId { get; set; }
+
+        [Required(ErrorMessage = "科目名称是必填项。")]
+        [StringLength(20, ErrorMessage = "科目名称不能超过 20 个字符。")]
+        public string SubjectName { get; set; }
+
+        public string Description { get; set; }
+    }
+}

Entities/DTO/Submission/StudentSubmissionDetailDto.cs

@@ -0,0 +1,41 @@
+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+
+namespace Entities.DTO
+{
+    public class StudentSubmissionDetailDto
+    {
+        // 基本信息
+        public Guid Id { get; set; }
+        public Guid AssignmentId { get; set; }
+        public Guid StudentId { get; set; }
+        public DateTime SubmissionTime { get; set; }
+        public float OverallGrade { get; set; }
+        public string OverallFeedback { get; set; } = string.Empty;
+        public SubmissionStatus Status { get; set; }
+        
+        // Assignment信息
+        public ExamDto Assignment { get; set; } = new ExamDto();
+        
+        // 错误分析
+        public Dictionary<string, int> ErrorTypeDistribution { get; set; } = new Dictionary<string, int>();
+        public Dictionary<string, float> ErrorTypeScoreDistribution { get; set; } = new Dictionary<string, float>();
+        
+        // 成绩统计
+        public int TotalRank { get; set; }
+        public List<float> AllScores { get; set; } = new List<float>();
+        public float AverageScore { get; set; }
+        public float ClassAverageScore { get; set; }
+        
+        // 课文分布
+        public Dictionary<string, int> LessonErrorDistribution { get; set; } = new Dictionary<string, int>();
+        public Dictionary<string, int> KeyPointErrorDistribution { get; set; } = new Dictionary<string, int>();
+        
+        // 基础统计
+        public int TotalQuestions { get; set; }
+        public int CorrectCount { get; set; }
+        public int ErrorCount { get; set; }
+        public float AccuracyRate { get; set; }
+    }
+}

Entities/DTO/Submission/StudentSubmissionSummaryDto.cs

@@ -0,0 +1,22 @@
+using System;
+
+namespace Entities.DTO
+{
+    public class StudentSubmissionSummaryDto
+    {
+        public Guid Id { get; set; }
+        public string AssignmentName { get; set; }
+        public int ErrorCount { get; set; }
+        public DateTime CreatedDate { get; set; }
+        public float Score { get; set; }
+        public int TotalQuestions { get; set; }
+        public string StudentName { get; set; }
+        public string Status { get; set; }
+    }
+
+    public class StudentSubmissionSummaryResponseDto
+    {
+        public List<StudentSubmissionSummaryDto> Submissions { get; set; }
+        public int TotalCount { get; set; }
+    }
+}

Entities/DTO/Submission/SubmissionDetailDto.cs

@@ -0,0 +1,21 @@
+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class SubmissionDetailDto
+	{
+		public Guid Id { get; set; } = Guid.Empty;
+		public Guid SubmissionId { get; set; }
+		public Guid StudentId { get; set; }
+		public Guid ExamQuestionId { get; set; }
+		public string? StudentAnswer { get; set; }
+		public bool? IsCorrect { get; set; }
+		public float? PointsAwarded { get; set; }
+		public string? TeacherFeedback { get; set; }
+	}
+}

Entities/DTO/Submission/SubmissionDto.cs

@@ -0,0 +1,23 @@
+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class SubmissionDto
+	{
+		public Guid Id { get; set; } = Guid.Empty;
+		public Guid ExamId { get; set; }
+		public Guid StudentId { get; set; }
+		public DateTime SubmissionTime { get; set; }
+		public float OverallGrade { get; set; } = 0;
+		public string OverallFeedback { get; set; } = string.Empty;
+		public Guid? GraderId { get; set; }
+		public DateTime? GradedAt { get; set; }
+		public SubmissionStatus Status { get; set; }
+		public List<SubmissionDetailDto> SubmissionDetails { get; set; } = new List<SubmissionDetailDto>();
+	}
+}

Entities/DTO/Submission/SubmissionListDto.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public record SubmissionListDto
+	{
+		public Guid Id { get; init; }
+
+
+		public float OverallGrade { get; init; }
+		public int ErrorCount { get; init; }
+		public Dictionary<string, int>? ErrorQuestionTypeDistribution { get; init; }
+		public Dictionary<string, int>? ErrorQuestionLessonDistribution { get; init; }
+
+
+		public byte AttemptNumber { get; init; }
+	}
+}

Entities/DTO/Submission/SubmissionUpdateDto.cs

@@ -0,0 +1,12 @@
+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public record SubmissionDetailTeacherUpdateDto(Guid Id, bool IsCorrect, float? PointsAwarded);
+	public record SubmissionTeacherUpdateDto(Guid Id, float OverallGrade, string? OverallFeedback, SubmissionStatus Status, ICollection<SubmissionDetailTeacherUpdateDto> SubmissionUpdateDetails);
+}

Entities/DTO/Textbook/CreateTextbookDto.cs

@@ -0,0 +1,26 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    /// <summary>
+    /// 创建教材数据传输对象
+    /// </summary>
+    public class CreateTextbookDto
+    {
+        [Required(ErrorMessage = "教材标题是必填项。")]
+        [StringLength(100, ErrorMessage = "教材标题不能超过 100 个字符。")]
+        public string Title { get; set; }
+
+        [Required(ErrorMessage = "年级是必选项。")]
+        public string Grade { get; set; }
+
+        [Required(ErrorMessage = "出版社是必选项。")]
+        public string Publisher { get; set; }
+
+        [Required(ErrorMessage = "学科领域是必选项。")]
+        public string SubjectArea { get; set; }
+
+        public string Description { get; set; }
+    }
+}

Entities/DTO/Textbook/TextbookDto.cs

@@ -0,0 +1,28 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    /// <summary>
+    /// 教材数据传输对象
+    /// </summary>
+    public class TextbookDto
+    {
+        public Guid Id { get; set; }
+
+        [Required(ErrorMessage = "教材标题是必填项。")]
+        [StringLength(100, ErrorMessage = "教材标题不能超过 100 个字符。")]
+        public string Title { get; set; }
+
+        [Required(ErrorMessage = "年级是必选项。")]
+        public string Grade { get; set; }
+
+        [Required(ErrorMessage = "出版社是必选项。")]
+        public string Publisher { get; set; }
+
+        [Required(ErrorMessage = "学科领域是必选项。")]
+        public string SubjectArea { get; set; }
+
+        public string Description { get; set; }
+    }
+}

Entities/DTO/Textbook/TextbookResponseDto.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+
+namespace Entities.DTO
+{
+    /// <summary>
+    /// 教材响应数据传输对象
+    /// </summary>
+    public class TextbookResponseDto
+    {
+        public Guid Id { get; set; }
+        public string Title { get; set; }
+        public string Grade { get; set; }
+        public string Publisher { get; set; }
+        public string SubjectArea { get; set; }
+        public string Description { get; set; }
+
+        // 导航属性
+        public int LessonCount { get; set; }
+        public List<string> LessonTitles { get; set; } = new List<string>();
+    }
+}

Entities/DTO/Textbook/UpdateTextbookDto.cs

@@ -0,0 +1,29 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    /// <summary>
+    /// 更新教材数据传输对象
+    /// </summary>
+    public class UpdateTextbookDto
+    {
+        [Required(ErrorMessage = "教材ID是必填项。")]
+        public Guid Id { get; set; }
+
+        [Required(ErrorMessage = "教材标题是必填项。")]
+        [StringLength(100, ErrorMessage = "教材标题不能超过 100 个字符。")]
+        public string Title { get; set; }
+
+        [Required(ErrorMessage = "年级是必选项。")]
+        public string Grade { get; set; }
+
+        [Required(ErrorMessage = "出版社是必选项。")]
+        public string Publisher { get; set; }
+
+        [Required(ErrorMessage = "学科领域是必选项。")]
+        public string SubjectArea { get; set; }
+
+        public string Description { get; set; }
+    }
+}

Entities/DTO/User/StudentExamDetailDto.cs

@@ -0,0 +1,21 @@
+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+    public record StudentExamDetailDto
+    {
+        public Guid Id { get; init; }
+        public string? DisplayName { get; init; }
+
+        public uint ErrorQuestionNum { get; init; }
+        public Dictionary<string, uint> ErrorQuestionTypes { get; init; } = new Dictionary<string, uint>();	
+        public Dictionary<SubjectAreaEnum, uint> SubjectAreaErrorQuestionDis { get; init; } = new Dictionary<SubjectAreaEnum, uint>();	
+        public Dictionary<byte, uint> LessonErrorDis { get; init; } = new Dictionary<byte, uint>();	
+        public float Score { get; init; }
+    }
+}