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;
       }