添加项目文件。

Entities/Contracts/AssignmentQuestion.cs

@@ -0,0 +1,50 @@
+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; }
+
+		[Required]
+		[Column("question_id")]
+		[ForeignKey("Question")]
+		public Guid QuestionId { get; set; }
+
+		[Required]
+		[Column("question_number")]
+		public uint QuestionNumber { get; set; }
+
+		[Column("created_at")]
+		public DateTime CreatedAt { get; set; }
+
+		[Required]
+		[Column("detail_id")]
+		[ForeignKey("AssignmentGroup")]
+		public Guid AssignmentGroupId { get; set; }
+
+		[Column("deleted")]
+		public bool IsDeleted { get; set; }
+
+
+		public Question Question { get; set; }
+		public ICollection<SubmissionDetail> SubmissionDetails { get; set; }
+		public AssignmentGroup AssignmentGroup { get; set; }
+
+		public AssignmentQuestion()
+		{
+			Id = Guid.NewGuid();
+			SubmissionDetails = new HashSet<SubmissionDetail>();
+		}
+	}
+}