更新班级和学生相关功能

TechHelper.Server/Services/IClassService.cs

@@ -11,6 +11,6 @@ namespace TechHelper.Services
 		public Task<ApiResponse> GetUserClassRole(Guid user); // List<UserClassRoleDto>
 		public Task<ApiResponse> GetClassStudents(ClassDto classDto); // Class
 		public Task<ApiResponse> GetGradeClasses(byte Grade); // Class
-
+		Task GetClassStudents(byte grade, byte id);
 	}
 }