Powershell:无法启动服务时引发捕获异常 [英] Powershell: Catch exception thrown when unable to start a service

问题描述

我似乎无法捕捉到Start-Service引发的异常.这是我的代码:

I seem unable to catch an exception thrown by Start-Service. Here is my code:

try
{
    start-service "SomeUnStartableService"
}
catch [Microsoft.PowerShell.Commands.ServiceCommandException]
{
    write-host "got here"
}

运行此命令时，会引发但未捕获到异常:

When I run this, the exception is thrown but not caught:

*Service 'SomeUnStartableService' start failed.
At line:3 char:18
+     start-service <<<<  "SomeUnStartableService"
    + CategoryInfo          : OpenError: (System.ServiceProcess.ServiceController:ServiceController) [Start-Service], ServiceCommandException
    + FullyQualifiedErrorId : StartServiceFailed,Microsoft.PowerShell.Commands.StartServiceCommand*

$ErrorActionPreference设置为停止"，所以这不应该是问题.

$ErrorActionPreference is set to Stop, so this shouldn't be the problem.

当我将代码更改为catch [Exception]时，将捕获异常并打印此处获得".

When I alter my code to catch [Exception], the exception is caught and "got here" is printed.

start-service是否抛出ServiceCommandException或其他东西?看起来好像是，但是我抓不到它！

Does start-service throw a ServiceCommandException or something else? It looks as though it is but I cannot catch it!

-编辑---

理想情况下，我可以编写以下内容，如果start-service没有引发异常，并且仅捕获由start-service引发的异常，则引发异常:

Ideally I could write the following, and throw an exception if start-service did not throw an exception, and only catch an exception thrown by start-service:

try
{
    start-service "SomeUnStartableService"
    throw (new-object Exception("service started when expected not to start"))
}
catch [Microsoft.PowerShell.Commands.ServiceCommandException]
{
    write-host "got here"
}

推荐答案

我通常不限制catch短语，而是使用catch块中的逻辑测试来处理异常:

I usually don't limit the catch-phrase but handle the exceptions with logical tests within the catch-block:

try
{
  start-service "SomeUnStartableService" -ea Stop
}
catch
{
   if ( $error[0].Exception -match "Microsoft.PowerShell.Commands.ServiceCommandException")
   {
      #do this
   }
   else
   {
      #do that
   }
}

可能不那么干净，并且可能导致巨大的捕获块.但是，如果可行...;)

Maybe not as clean, and may result in huge catch blocks. But if it works... ;)

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