添加项目文件。

Entities/Contracts/ClassStudent.cs

@@ -0,0 +1,34 @@
+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; }
+	}
+}