一 問題描述 問題：The instance of entity type xxxx cannot be tracked because another instance with the same key value for Id is already being tracked. When attaching existing entities, ensure that only one en ...
2019-05-07 11:32 0 1652 推薦指數：
這里記錄一個在使用.net core中ef core執行數據庫操作時遇到的問題： 我在代碼中使用DbContext下的Update方法准備將更改后的數據像這樣步到數據庫： 這是很常見 ...
具體詳細錯誤信息：The instance of entity type 'xxx' cannot be tracked because another instance with the same key value for {'Id'} is already being tracked. ...
with the same key value for {'Id'} is already being tracked. ...
在做單元測試的時候碰到以下報錯： 具體報錯代碼如下： 項目平時運行是沒問題的，但在單元測試時會報錯，可能跟在測試時一個方法里多次調用有關。 我的做法如下：使用try catch，在異常里操作 1、修改狀態 Entry (entity).State ...
本文轉自：http://stackoverflow.com/questions/6033638/an-object-with-the-same-key-already-exists-in-the-objectstatemanager-the-object cannot be tracked ...
加上AsNoTracking。 人不能兩次踏入同一條河。 我 就踏入了。o(╥﹏╥)o ...
Attaching an entity of type 'xxx' failed because another entity of the same type already has the same primary key value. This can happen when using ...
問題的詳細描述： Attaching an entity of type 'xxxxx' failed because another entity of the same type already has the same primary key value. This can happen ...
