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並前往https://www.adoclib.com/blog/how-to-check-if-a-string-is-null-or-empty-in-powershell.html

How To Check If A String Is Null Or Empty In Powershell

$null is an automatic variable in PowerShell used to represent NULL. You can If you use $null in a string, then it's a blank value (or empty string).

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