加上AsNoTracking。
人不能兩次踏入同一條河。
我
就踏入了。o(╥﹏╥)o
免責聲明！
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The instance of entity type 'XXX' cannot be tracked because another instance with the same key value for {'Id'} is already being tracked
[轉] EF cannot be tracked because another instance of this type with the same key is already being tracked
The instance of entity type 'XXX' cannot be tracked because another instance with the same key value for {'XX'} is already being tracked.
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The instance of entity type 'Menu' cannot be tracked because another instance with the same key value for {'Id'} is already being tracked.
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