为什么错误通过TRY / CATCH循环在Powershell中滑倒

问题描述

我有一个简单的循环，它得到服务器列表中的所有序列号;

开始

  foreach（$ computer in $ computers）
 {
 try 
 {
 Get-WmiObject -computer $ computer -Class Win32_OperatingSystem | Select Serial * 
} 
 catch 
 {
写入主机无效的服务器
} 
} 
  

END

但是，输出看起来很丑，出现以下错误以及几个服务器的正确输出

Get-WmiObject：RPC服务器不可用
Get-WmiObject：访问被拒绝等（不是 Try / Catch 循环以消除那些？）

奇怪的是，输出说无效的服务器，所以错误之间的区别和Try / Catch循环？

我在这里做错了什么？请问如果有任何问题。

解决方案

为了使上述代码抛出异常，您可以添加 -ErrorAction停止到您的 Get-WmiObject 行，如下所示：

 code> Get-WmiObject -computer $ computer  - 类Win32_OperatingSystem -ErrorAction Stop |选择Serial * 
  

看到Keith Hill的这篇文章：。 p>

I got a simple loop which gets all the serial Numbers in the Server List;

Start

foreach ($computer in $computers)
{
    try
    {
        Get-WmiObject -computer $computer -Class Win32_OperatingSystem|Select Serial*
    }
    catch
    {
        Write-Host "Invalid Server"
    }
}

END

But, the output looks all ugly with following errors as well as the correct outputs for few servers.

Get-WmiObject : The RPC server is unavailableGet-WmiObject : Access Denied etc (Isnt it the purpose of Try/Catch loop to eliminate those?)

Strangely soemtimes the output says "Invalid Server" too , so what exactly is the difference between errors and what are the limitations of Try/Catch loops?

What am i doing wrong here? Please if any questions.

解决方案

To make the above code throw an exception, you can add -ErrorAction Stop to your Get-WmiObject line, like this:

Get-WmiObject -computer $computer -Class Win32_OperatingSystem -ErrorAction Stop | Select Serial*

See this article by Keith Hill: distinction between "terminating" and "non-terminating" errors.

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