PowerShell为cmdlet实现-AsJob [英] PowerShell implementing -AsJob for a cmdlet

问题描述

是否有一种很好的方法可以在自定义cmdlet中实现开关参数-AsJob，就像Invoke-Command一样?

Is there a nice way to implement the switch parameter -AsJob in custom cmdlets, like Invoke-Command has?

我想到的唯一方法是:

function Use-AsJob {
   [CmdletBinding()]
   [OutputType()]
   param (
      [Parameter(Mandatory = $true)]
      [string]
      $Message,

      [switch]
      $AsJob
   )

   # Wrap Script block in a variable
   $myScriptBlock = {
       # stuff
   }
   if ($AsJob) {
       Invoke-Command -ScriptBlock $myScriptBlock -AsJob
   }
   else {
       Invoke-Command -ScriptBlock $myScriptBlock
   }
}

有没有更好的方法?我找不到与此相关的Microsoft文档，任何线索都可以帮助您.

Is there a better approach? I couldn't find Microsoft docs on this, any lead helps.

推荐答案

如果我们做出以下假设:

If we make the following assumptions:

• 命令是脚本功能
• 功能不依赖于模块状态

然后，您可以将以下样板用于任何命令:

Then you can use the following boilerplate for any command:

function Test-AsJob {
    param(
        [string]$Parameter = '123',
        [switch]$AsJob
    )

    if ($AsJob) {
        # Remove the `-AsJob` parameter, leave everything else as is
        [void]$PSBoundParameters.Remove('AsJob')

        # Start new job that executes a copy of this function against the remaining parameter args
        return Start-Job -ScriptBlock {
            param(
                [string]$myFunction,
                [System.Collections.IDictionary]$argTable
            )

            $cmd = [scriptblock]::Create($myFunction)

            & $cmd @argTable 
        } -ArgumentList $MyInvocation.MyCommand.Definition,$PSBoundParameters
    }

    # here is where we execute the actual function
    return "Parameter was '$Parameter'"
}

现在您可以执行以下任一操作:

Now you can do either:

PS C:\> Test-AsJob
Parameter was '123'
PS C:\> Test-AsJob -AsJob |Receive-Job -Wait
Parameter was '123'

这篇关于PowerShell为cmdlet实现-AsJob的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！