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並前往https://www.thomasclaudiushuber.com/2020/03/12/c-different-ways-to-check-for-null/

C#: Different ways to Check for Null - Thomas Claudius Huber

public static int CountNumberOfSInName(string name) { if (name == null) ... Since C# version 7 you can use the is keyword for the null check ...

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