Powershell工作流的限制

最新推荐文章于 2025-07-20 10:22:53 发布

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最新推荐文章于 2025-07-20 10:22:53 发布

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分类专栏： PowerShell 介绍文章标签： powershell 工作流

本文链接：https://blog.youkuaiyun.com/melodytu/article/details/50735481

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本文摘自微软博客，探讨了PowerShell工作流的限制，如在workflow中不能直接使用变量$a，以及一些仅限本地执行的cmdlets。提到了可以使用about_系列帮助命令了解更多工作流相关参数和操作。

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以下信息是从微软的博客摘抄的：

下面举例子说明下switch的使用

workflow switchtest {

 param (

  [string]$os

 )

 switch ($os) {

  "XP" {"Time to upgrade"}

  "Windows7" {"OK – but not the lastest"}

  "Windows 8" {"Latest and greatest"}

 }

}

然而，报错了，说Windows PowerShell 工作流中不支持不区分大小写的 switch 语句，那么我们来改一下句子

我们继续修改

workflow switchtest {

 param (

  [string]$os

 )

 InlineScript {

 switch ($using:os) {

  "XP" {"Time to upgrade"}

  "Windows7" {"OK – but not the lastest"}

  "Windows 8" {"Latest and greatest"}

 }

}

}

继续来看看还有那些限制，依旧是摘抄微软博客的。

继续看看例子

重点请关注$Using:a，不能再像在powershell脚本中直接使用$a，这在workflow里面是不生效的。

继续从微软博客摘抄以下内容：

Unsupported cmdlet (group)	Reason
Alias, FormatData, History, Location, PSDrive, Transcript, TypeDate, Variable, Connect/Disconnect-Wsman	Only change Windows PowerShell session so not needed in workflow
Show-Command, Show-ControlPanelItem, Get-Credential, Show-EventLog, Out-Gridview, Read-Host, Debug-Process	Workflows don’t support interactive cmdlets
*BreakPoint, Get-PSCallStack, Set-PSDebug	Workflows don’t support script debugging
*Transaction	Workflows don’t support transactions
Format*	No formatting support
PSsession, PSsessionoption	Remoting controlled by workflow
Export-Console,Get-ControlPanelItem, Out-Default, Out-Null, Write-Host, Export-ModuleMember, Add-PSSnapin, Get-PSSnapin, Remove-PSSnapin, Trace-Command

继续~~~~

There are a number of cmdlets that are local execution only in workflows.

Add-Member	Compare-Object	ConvertFrom-Csv	ConvertFrom-Json
ConvertFrom-StringData	Convert-Path	ConvertTo-Csv	ConvertTo-Html
ConvertTo-Json	ConvertTo-Xml	ForEach-Object	Get-Host
Get-Member	Get-Random	Get-Unique	Group-Object
Measure-Command	Measure-Object	New-PSSessionOption	New-PSTransportOption
New-TimeSpan	Out-Default	Out-Host	Out-Null
Out-String	Select-Object	Sort-Object	Update-List
Where-Object	Write-Debug	Write-Error	Write-Host
Write-Output	Write-Progress	Write-Verbose