摘要：
TestDataSourceDataEntities context = new TestDataSourceDataEntities(); T_User model = new T_User(); model.UserID = "Gxw1111"; model.UserName = "aaaaaaaa"; model.Userpwd = "123456"; context.AddToT_User(model); context.SaveChanges();//报错地方百思不得其解释，最后发现1：实体中的表必须有主键（这里指示T_Us 阅读全文
