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並前往https://josipmisko.com/posts/c-sharp-add-to-list-does-not-exist

How to add an item to the list if it doesn't exist in C#? - Josip ...

C#. List<string> list = new List<string>() { "exists" }; list. ... If Contains is false, use Append on the IEnumerable to add the item.

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