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[Source] c# Dictionary The given key was not present in the dictionary

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Posted on 6/3/2016 4:18:49 PM | | | |
The given key was not present in the dictionary



Prompt this error, the given key does not exist in the dictionary, that is, the key in the dictionary does not exist...



This is the original way of writing, but it is actually the wrong way to write.

I want to judge if the key exists, not that way!!

The correct way to write it is as follows:







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