C# EF@@ROWCOUNT>0导致错误的插入

我正在尝试更新数据库实体MamConfiguration\u V1中的现有配置，称之为父级

我想

1向其添加参考导航成员MamConfigurationToBrowser_V1称之为子项

2我不会更改父实体中唯一属性的值。父项名称

我从数据库得到了要更新的实体

并使用相同的上下文

我添加参考成员

我不会更改它的名称属性

然而，我得到了一个DB错误，唯一性限制违反

{"Violation of UNIQUE KEY constraint 'UQ_MamConfigurations_V1'. Cannot insert duplicate key in object 'dbo.MamConfiguration_V1'. The duplicate key value is (elad_14Apr_1315).\r\nThe statement has been terminated."}

我进行了DB嗅探，看到了生成的代码：

exec sp_executesql N'update [dbo].[MamConfiguration_V1]
set [Name] = @0, [Description] = @1, [StatusId] = @2, [Type] = @3, [UpdatedDate] = @4, [PercentageTraffic] = @5, [NumericTraffic] = @6
where ([ConfigurationId] = @7)
',N'@0 nvarchar(50),@1 nvarchar(200),@2 int,@3 int,@4 datetime2(7),@5 int,@6 int,@7 int',@0=N'elad_17Apr_1120_tmpToRemove_',@1=N'elad_22Apr_1120',@2=2,@3=0,@4='2013-04-23 11:17:25.4991650',@5=55,@6=-1,@7=32

//还有一些命令

exec sp_executesql N'insert [dbo].[MamConfiguration_V1]([Name], [Description], [StatusId], [Type], [CreatedDate], [UpdatedDate], [PercentageTraffic], [NumericTraffic])
values (@0, @1, @2, @3, @4, @5, @6, @7)
select [ConfigurationId]
from [dbo].[MamConfiguration_V1]
where @@ROWCOUNT > 0 and [ConfigurationId] = scope_identity()',N'@0 nvarchar(50),@1 nvarchar(200),@2 int,@3 int,@4 datetime2(7),@5 datetime2(7),@6 int,@7 int',@0=N'elad_17Apr_1120_tmpToRemove_',@1=N'elad_22Apr_1120',@2=2,@3=0,@4='0001-01-01 00:00:00',@5='0001-01-01 00:00:00',@6=55,@7=-1

我希望upsert是@ROWCOUNT=0

我做错了什么

我的代码和数据库是：

        public void SaveCofiguration(MamConfiguration_V1Ui itemUi)
        {
            var itemEf = mMamConfiguration_V1UiToEfConvertor.ConvertToNewEf(itemUi);

            using (var maMDBEntities = new MaMDBEntities())
            {
                IDal<MamConfiguration_V1> mamConfigurationDal = mDalFactory.GetDal<MamConfiguration_V1>(maMDBEntities);

                mamConfigurationDal.Save(itemEf);
            }
        }

         public MamConfiguration_V1 GetById(object id)
        {           
                id.ThrowIfNull("id");

                int configurationId = Convert.ToInt32(id);

                var result =
                    mMaMDBEntities.MamConfiguration_V1.SingleOrDefault(item => item.ConfigurationId == configurationId);

                return result;

        }

       public MamConfiguration_V1 Save(MamConfiguration_V1 item)
        {

                item.ThrowIfNull("item");

                var itemFromDB = GetById(item.ConfigurationId);

                if (itemFromDB != null)
                {
                    UpdateEfItem(itemFromDB, item);

                   // if (mMaMDBEntities.ObjectStateManager.GetObjectStateEntry(itemFromDB).State == EntityState.Detached)
//                    {
  //                      mMaMDBEntities.MamConfiguration_V1.AddObject(itemFromDB);
    //                }

                    // Attached object tracks modifications automatically
                    mMaMDBEntities.SaveChanges();

                    return item;
                }





       private void UpdateEfItem(MamConfiguration_V1 itemFromDb, MamConfiguration_V1 itemFromUi)
            {
                itemFromDb.UpdatedDate = DateTime.Now;

                itemFromDb.Description = itemFromUi.Description;

                itemFromDb.StatusId = itemFromUi.StatusId;

                itemFromDb.Name = itemFromUi.Name;

                itemFromDb.NumericTraffic = itemFromUi.NumericTraffic;

                itemFromDb.PercentageTraffic = itemFromUi.PercentageTraffic;

                itemFromDb.Type = itemFromUi.NumericTraffic;

                foreach (var item in itemFromDb.MamConfigurationToBrowser_V1.ToList())
                {
                    if (itemFromUi.MamConfigurationToBrowser_V1.All(b => b.BrowserVersionId != item.BrowserVersionId))
                    {
                        mMaMDBEntities.MamConfigurationToBrowser_V1.DeleteObject(item);
                    }
                }

                for (int i = 0; i < itemFromUi.MamConfigurationToBrowser_V1.Count; i++)
                {
                    var element = itemFromUi.MamConfigurationToBrowser_V1.ElementAt(i);
                    var item = itemFromDb.MamConfigurationToBrowser_V1.SingleOrDefault(b => b.BrowserVersionId == element.BrowserVersionId);
                    if (item != null)
                    {
                        // copy properties from element to item
                    }
                    else
                    {
                        element.Browser = mMaMDBEntities.Browsers.Single(browserItem =>
                            browserItem.BrowserID == element.BrowserID);

                        //element.MamConfiguration_V1 = itemFromDb;

                        //have also tried: element.MamConfiguration_V1 = null;

                        //element.MamConfiguration_V1Reference = null;

                        itemFromDb.MamConfigurationToBrowser_V1.Add(element);
                    }
                }
            }

更新2

我尝试了@AzharKhorasany解决方案，但出现了相同的错误：

for (int i = 0; i < itemFromUi.MamConfigurationToBrowser_V1.Count; i++)
            {
                var element = itemFromUi.MamConfigurationToBrowser_V1.ElementAt(i);
                var item = itemFromDb.MamConfigurationToBrowser_V1.SingleOrDefault(b => b.BrowserVersionId == element.BrowserVersionId);
                if (item != null)
                {
                    // copy properties from element to item
                }
                else
                {
                    element.Browser = mMaMDBEntities.Browsers.Single(browserItem =>
                        browserItem.BrowserID == element.BrowserID);

                    element.MamConfigurationId = itemFromDb.ConfigurationId;

                    //element.MamConfiguration_V1 = itemFromDb;

                    //have also tried: element.MamConfiguration_V1 = null;

                    //element.MamConfiguration_V1Reference = null;
                    //mMaMDBEntities.AddToMamConfigurationToBrowser_V1(itemFromUi.MamConfigurationToBrowser_V1.ElementAt(0)); // add as inserted

                    itemFromDb.MamConfigurationToBrowser_V1.Add(element);
                }
            }

for (int i = 0; i < itemFromUi.MamConfigurationToBrowser_V1.Count; i++)
            {
                var element = itemFromUi.MamConfigurationToBrowser_V1.ElementAt(i);
                var item = itemFromDb.MamConfigurationToBrowser_V1.SingleOrDefault(b => b.BrowserVersionId == element.BrowserVersionId);
                if (item != null)
                {
                    // copy properties from element to item
                }
                else
                {
                    element.Browser = mMaMDBEntities.Browsers.Single(browserItem =>
                        browserItem.BrowserID == element.BrowserID);

                    element.MamConfigurationId = itemFromDb.ConfigurationId;

                    //element.MamConfiguration_V1 = itemFromDb;

                    //have also tried: element.MamConfiguration_V1 = null;

                    //element.MamConfiguration_V1Reference = null;
                    //mMaMDBEntities.AddToMamConfigurationToBrowser_V1(itemFromUi.MamConfigurationToBrowser_V1.ElementAt(0)); // add as inserted

                    itemFromDb.MamConfigurationToBrowser_V1.Add(element);
                }
            }