Uncatchable异常（PowerShell）

问题描述

我有一个可靠地生成异常的代码。这是预期的，所以我不希望它在脚本结束时显示，当我转储$错误变量来查找实际的问题。

第1步是找到这个异常并处理它，对吧？我不能那么远这是我所得到的：

 功能添加PowerShellSnapIn（$ SnapInName）{
尝试{
如果（（Get-PSSnapin -Name $ SnapInName）-eq $ null）{
写入警告SnapIn未加载
} 
}捕获[System.Exception] {
写入警告错误捕获
} 
} 
 
添加PowerShellSnapIn -SnapInNameMicrosoft.Exchange.Management.PowerShell.Admin
  

如果我运行这个代码，我可以看到异常，但是我从来没有看到我的一些写警告测试消息， Catch块捕获到异常。我一定在这里遗漏的东西。以下是我看到的例外：

Get-PSSnapin：没有匹配模式Microsoft.Exchange.Management.PowerShell.Admin的Windows PowerShell管理单元找到。检查模式，然后再次尝试该命令。
在C：\users\myuser\Desktop\Test.ps1：4 char：20
+ if（（Get-PSSnapin<<< -Name $ SnapInName） -eq $ null）{
+ CategoryInfo：InvalidArgument：（Microsoft.Excha ... owerShell.Admin：String）[Get-PSSnapin]，PSArgumentException
+ FullyQualifiedErrorId：NoPSSnapInsFound，Microsoft.PowerShell.Commands。 GetPSSnapinCommand

编辑：提前感谢任何花时间帮助我的人！

解决方案

您应该将 -ErrorAction stop 添加到您的 Get-PSSnapin 中以获取进入抓住块。

 功能添加PowerShellSnapIn（$ SnapInName）{
尝试{
 if（（Get-PSSnapin  - 命名$ SnapInName -ErrorAction Stop）-eq $ null）{
写入警告SnapIn未加载
} 
}捕获[System.Exception] {
 Write-警告错误捕获
} 
} 
 
添加PowerShellSnapIn -SnapInNameMicrosoft.Exchange.Management.PowerShell.Admin
  

I have code that reliably generates an exception. This is expected so I don't want it to show up at the end of my script when I dump the $error variable to look for actual problems.

Well step 1 is to find this exception and handle it, right? I can't get that far. Here is what I've got:

Function Add-PowerShellSnapIn($SnapInName){
    Try{
        if ((Get-PSSnapin -Name $SnapInName) -eq $null){
            Write-Warning "SnapIn Is Not Already Loaded"
        }
    }Catch [System.Exception]{
        Write-Warning "Error Caught"
    }
}

Add-PowerShellSnapIn -SnapInName "Microsoft.Exchange.Management.PowerShell.Admin"

If I run this code I can see the exception, but I never see my little "Write-Warning" test message to indicate that the Catch block caught the exception. I must be missing something here. Here is the exception I see:

Get-PSSnapin : No Windows PowerShell snap-ins matching the pattern 'Microsoft.Exchange.Management.PowerShell.Admin' were found. Check the pattern and then try the command again.At C:\users\myuser\Desktop\Test.ps1:4 char:20+ if ((Get-PSSnapin <<<< -Name $SnapInName) -eq $null){ + CategoryInfo : InvalidArgument: (Microsoft.Excha...owerShell.Admin:String) [Get-PSSnapin], PSArgumentException + FullyQualifiedErrorId : NoPSSnapInsFound,Microsoft.PowerShell.Commands.GetPSSnapinCommand

Edit: Thanks in advance for anyone who takes the time to help me out!

解决方案

You should add -ErrorAction stop to your Get-PSSnapin to get into the Catch Block.

Function Add-PowerShellSnapIn($SnapInName){
    Try{
        if ((Get-PSSnapin -Name $SnapInName -ErrorAction Stop) -eq $null){
            Write-Warning "SnapIn Is Not Already Loaded"
        }
    }Catch [System.Exception]{
        Write-Warning "Error Caught"
    }
}

Add-PowerShellSnapIn -SnapInName "Microsoft.Exchange.Management.PowerShell.Admin"

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