IsNotNullOrEmpty如果值是字串,您可以使用靜態字串函式來檢查值是否為 $null 或同時為空字串。PowerShell 複製 if ( -not [string]::IsNullOrEmpty( $value ) ){...} 當我知道實值類型應該是字串時,我經常會使用這個 。當我檢查 $null 時我是一個防禦腳本手。 每當我呼叫函式並將它指派給變數時,我...
functionTest-MrVerboseOutput{ [CmdletBinding()]param( [ValidateNotNullOrEmpty()] [string[]]$ComputerName=$env:COMPUTERNAME)foreach($Computerin$ComputerName) {#Attempting to perform an action on $Computer <<-- Don't use#inline comments like this, use write verbose instead.Write-Output$Computer...
When you run the function, the value you supply for a parameter is assigned to a variable that contains the parameter name. The value of that variable can be used in the function. The following example is a function calledGet-SmallFiles. This function has a$Sizeparameter. The function displa...
Right-hand values are always treated as singleton instances, even when they're collections. The comparison operators can't effectively compare collections to collections. If there are no matches in the collection, comparison operators return an empty array. For example: PowerShell Copy $a =...
Beginning in Windows PowerShell 3.0, a collection of zero or one object has some properties of arrays.Creating and initializing an arrayTo create and initialize an array, assign multiple values to a variable. The values stored in the array are delimited with a comma and separated from the ...
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Allow empty prefix string in Import-Module -Prefix to override default prefix in manifest (#20409) (Thanks @MartinGC94!) Update variable/property assignment completion so it can fallback to type inference (#21134) (Thanks @MartinGC94!) Use Get-Help approach to find about_*.help.txt files...
"! Variable assignments persist between calls. "! "! @parameter iv_command | PowerShell command or script methods Execute importing value(IV_COMMAND) type STRING. "! Evaluates a PowerShell expression and returns its value as string "! "! @parameter iv_expression | PowerShell command "! "!
First, we take the value of the calendar’s SelectionStart property and store it in a variable named $dtmDate. That’s simply a fancy way of saying we’re going to grab the date that the user selected and store it in the variable $dtmDate. Second, we’re going to call the Close me...
Windows PowerShell Tip: Finding All the Empty Folders in a Directory Tree Windows PowerShell Tip: Formatting Numbers and Dates Using the CultureInfo Object Windows PowerShell Tip: Getting Information About the Logged-On User Windows PowerShell Tip: Getting Rid of a COM Object (Once and For All...