Question

我已将对象附加到上下文，尽管我收到错误Cannot remove an entity that has not been attached.

if (itemRemove != -1)
{
    //var deleteDetails = DBContext.ProductCustomizationMasters.Where(p => p.ProductID == this.ProductID && p.CustomCategoryID == catId && p.CustomType == (short)catTypeId).Single();
    var deleteDetails = DBContext.ProductCustomizationMasters.Single(p => p.ProductID == this.ProductID && p.CustomCategoryID == catId && p.CustomType == (short)catTypeId);
    DBContext.ProductCustomizationMasters.Attach(deleteDetails);
    DBContext.ProductCustomizationMasters.DeleteOnSubmit(deleteDetails);
    RemoveCategoryItems(catId, catTypeId);
}


private void RemoveCategoryItems(int catId, CategoryType catTypeId)
        {
            switch (catTypeId)
            {
                case CategoryType.Topping:
                    (this.ToppingItems.Where(xx => xx.ToppingInfo.CatID == catId && xx.ProductID == this.ProductID).Single()).IsDefault = false;
                    FreeToppingItems.RemoveAll(x => x.ProductID == this.ProductID && x.ToppingInfo.CatID == catId);
                    break;
                case CategoryType.Dressing:
                    (this.DressingItems.Where(xx => xx.DressingInfo.CatID == catId && xx.ProductID == this.ProductID).Single()).IsDefault = false;
                    FreeDressingItems.RemoveAll(x => x.ProductID == this.ProductID && x.DressingInfo.CatID == catId);
                    break;
                case CategoryType.SpecialInstruction:
                    (this.InstructionItems.Where(xx => xx.InstructionInfo.CatID == catId && xx.ProductID == this.ProductID).Single()).IsDefault = false;
                    FreeInstructionItems.RemoveAll(x => x.ProductID == this.ProductID && x.InstructionInfo.CatID == catId);
                    break;
            }
        }

Answer 1

第一个IDEA - 您无需附加要删除的项目。该项已附加到上下文，并且正在管理状态。只需跳过附加行并删除该对象。

编辑由于附件似乎不是您的问题，请试一试：

     if (itemRemove != -1)
     {
         var deleteDetails = DBContext.ProductCustomizationMasters.Single(p => p.ProductID == this.ProductID && p.CustomCategoryID == catId && p.CustomType == (short)catTypeId);
        //Obviously, this isn't going to work directly, you need to actually assign the ID, Primary Key Field here...
        var deleteMe = new ProductCustomizationMasters() { PrimaryKey = deleteDetails.PrimaryKey };
        DBContext.Attach(deleteMe);
        DBContext.DeleteOnSubmit(deleteMe);
        DBContext.SubmitChanges();

        RemoveCategoryItems(catId, catTypeId);
      }

再次编辑 - 您发布的代码似乎不是您问题的根源。此代码之外的某些内容正在设置一个对象，以便从尚未附加的上下文中删除。我建议您重新检查代码并检查所有对“DeleteOnSubmit”的引用，并确保在标记它们时附加这些实体。

尽管将对象附加到上下文获取错误？无法删除尚未附加的实体

1 个答案: