【c#】BAD REQUEST ||Error code: 400 reason

I have been encountering a problem while writing code today:
error screenshot:
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original code:
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The reason is that when directly adjusting the interface, the incoming parameter is null, because my LIST=null. If it is wrong by default, you can see it after changing it to a comment.

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Origin blog.csdn.net/KJJfighting/article/details/130607600