if語句不僅允許您在語句為$true時指定動作,也允許您在語句為$false時指定動作。 這就是else語句發揮作用的地方。 否則 使用時,else語句一律是if語句的最後一個部分。 PowerShell if(Test-Path-Path$Path-PathTypeLeaf ) {Move-Item-Path$Path-Destination$archivePath}else{Write-Warning"$pathdoesn't exist or...
PS> $object = [PSCustomObject]@{Name='TestObject'} PS> $object.count $null 如果仍在使用 PowerShell 5.1,则可以在检查计数之前将对象包装在数组中,以获取准确的计数。PowerShell 复制 if ( @($array).count -gt 0 ) { "Array isn't empty" } 稳妥起见,请检查是否有 $null,然后再检查计数。Pow...
The array sub-expression operator creates an array from the statements inside it. Whatever the statement inside the operator produces, the operator places it in an array. Even if there is zero or one object.The syntax of the array operator is as follows:...
A function is a list of PowerShell statements that has a name that you assign. When you run a function, you type the function name. The statements in the list run as if you had typed them at the command prompt. Functions can be as simple as: PowerShell Copy function Get-PowerShell...
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PowerShell Bonus: Getting an Array of Day/Month Names To tell you the truth this has nothing to do with the Get-Date cmdlet, but we decided to tack this on to this week’s tip because we found in interesting. The .NET Framework class System.Globalization.DateTimeFormatInfo is designed to...
Because the color black does not appear in our array, PowerShell is going to respond by telling us this:Copy False Pretty handy. (And notice that, as an added bonus, we got back the word False rather than a 0.)Now, what if you’d like to know if the array $arrColors doesn’t...
TheContextparameter doesn't change the number of objects generated bySelect-String.Select-Stringgenerates oneMatchInfoobject for each match. The context is stored as an array of strings in theContextproperty of the object. When the output of aSelect-Stringcommand is sent down the pipeline to anot...
Update 12/13/2013: Want to know if an error you encountered is terminating or non-terminating? Check to see if the error behavior is affected by changing the $ErrorActionPreference. According to the MSDN documentation here, "Neither $ErrorActionPreference nor the ErrorAction common parameter affe...
Return Array.Empty instead of collection [] (#25137) (Thanks @ArmaanMcleod!) Tools Check GH token availability for Get-Changelog (#25133) Tests Add XUnit test for HandleDoubleAndSingleQuote in CompletionHelpers class (#25181) (Thanks @ArmaanMcleod!) Build and Packaging Improvements Switch to...