PowerShell: Try...Catch...Finally 实现方法

本文转载自查看原文 2012-06-22 08:47 2991 PowerShell

PowerShell 本身有很多很好的错误控制，但是习惯于.net编程的人员，更喜欢用Try Catch Finally方法，尤其当有一段代码必须被执行到的时候。现在好了，adweigert 想出了一个好方法来实现。这个函数已经在多种情况下测试过，希望能对你有帮助。

1      function Try
2     {
3          param
4         (
5             [ScriptBlock] $Command = $( throw " The parameter -Command is required. "),
6             [ScriptBlock] $Catch   = { throw $_ },
7             [ScriptBlock] $Finally = {}
8         )
9
10         & {
11              $local:ErrorActionPreference = " SilentlyContinue "
12
13              trap
14             {
15                  trap
16                 {
17                     & {
18                          trap { throw $_ }
19                         & $Finally
20                     }
21
22                      throw $_
23                 }
24
25                  $_ | & { & $Catch }
26             }
27
28             & $Command
29         }
30
31         & {
32              trap { throw $_ }
33             & $Finally
34         }
35     }

使用示例：

     # Example usage

    Try {
        echo " ::Do some work... "
        echo " ::Try divide by zero: $(0/0) "
    } -Catch {
        echo "   ::Cannot handle the error (will rethrow): $_ "
         # throw $_
    } - Finally {
        echo " ::Cleanup resources... "
    }

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