一个实体对象不能由多个 IEntityChangeTracker 实例引用。

错误代码

   public bool addSubOptionItem(csModel.cs_Answer answers)

       {

           bool result = false;

           wpe = new csWeiPlatformEntities();//实例化entity对象

           try

           {

               wpe.CreateObjectSet<cs_Answer>().AddObject(answers);

               wpe.SaveChanges();

               result = true;

           }

           catch (Exception)

           {

               result = false;

           }

           //wpe.Detach(answers);

           return result;

       }