添加项目文件。

Entities/Contracts/User.cs

@@ -0,0 +1,47 @@
+using Microsoft.AspNetCore.Identity;
+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? DisplayName { get; set; }	
+
+
+		[Column("deleted")]
+		public bool IsDeleted { get; set; }
+
+		public ICollection<ClassTeacher> TaughtClassesLink { get; set; }
+		public ICollection<ClassStudent> EnrolledClassesLink { 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>();
+			GradedSubmissions = new HashSet<Submission>();
+			SubmissionsAsStudent = new HashSet<Submission>();
+		}
+	}
+}