添加项目文件。

Entities/Contracts/ClassTeacher.cs

@@ -0,0 +1,27 @@
+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; }
+	}
+}