function Test-MrParameterValidation { [CmdletBinding()] param ( [ValidateNotNullOrEmpty()] [string[]]$ComputerName = $env:COMPUTERNAME ) Write-Output $ComputerName } 详细输出 如果要编写复杂的代码,则内联注释非常有用,但除非用户查看代
PS> $empty = $null PS> $empty[0] Error: Cannot index into a null array. 因此,在尝试访问数组中的元素之前,请确保数组不是 $null。Count数组和其他集合具有计数属性,可告知数组中有多少项。PowerShell 复制 PS> $data.count 4 PowerShell 3.0 向大多数对象添加了计数属性。 你可以使用单个对象,它应该...
PS>$null-eq$undefinedVariableTrue 如果变量名称键入错误,PowerShell 会将其视为不同的变量,且值为$null。 找到$null值的另一种方法是,当它们来自未提供任何结果的其他命令时。 PowerShell PS>functionGet-Nothing{} PS>$value=Get-NothingPS>$null-eq$valueTrue ...
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...
As you can see, all we’re doing here is assigning a value to a variable named $yes. Note that you can name this variable anything you want; it doesnothave to have the same name as the option. Even though we’re setting up a Yes option we could have named the variable $watermelon...
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And no, for once we’renotkidding; you reallycanuse Windows PowerShell to display messages in the notification area. If you couldn’t, then we’d have had no reason to put together a script like this one: [void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") ...
The client cannot connect to the destination specified in the request. Verify that the service on the destination is running and is accepting requests. A configuration error in the policy results in an empty value for theListeningOnproperty. Use the following command to check the value. ...
Stringify ErrorRecord with empty exception message to empty string (#24949) (Thanks @MatejKafka!) Add completion single/double quote support for -PSEdition parameter for Get-Module (#24971) (Thanks @ArmaanMcleod!) Error when New-Item -Force is passed an invalid directory name (#24936) (Than...
"! 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 "! "!