EF Core 修改实例报错： System.InvalidOperationException: The instance of entity type ProductInfo cannot be tracked because another instance with the same key value for Id is already being tracked. When attac ...
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具体详细错误信息：The instance of entity type 'xxx' cannot be tracked because another instance with the same key value for {'Id'} is already being tracked ...
一、问题描述 问题：The instance of entity type 'xxxx' cannot be tracked because another instance with the same key value for {'Id'} is already being ...
这里记录一个在使用.net core中ef core执行数据库操作时遇到的问题： 我在代码中使用DbContext下的Update方法准备将更改后的数据像这样步到数据库： 这是很常见 ...
在做单元测试的时候碰到以下报错： 具体报错代码如下： 项目平时运行是没问题的，但在单元测试时会报错，可能跟在测试时一个方法里多次调用有关。 我的做法如下：使用try catch，在异常里操作 1、修改状态 Entry (entity).State ...
本文转自：http://stackoverflow.com/questions/6033638/an-object-with-the-same-key-already-exists-in-the-objectstatemanager-the-object cannot be tracked ...
加上AsNoTracking。 人不能两次踏入同一条河。 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 ...
问题的详细描述： Attaching an entity of type 'xxxxx' failed because another entity of the same type already has the same primary key value. This can happen ...
