这篇文章主要介绍了PowerShell实现统计函数嵌套深度,本文分享一个函数,可以实现统计脚本执行的嵌套层次,需要的朋友可以参考下

　　当你调用某个函数时，PowerShell会增加一次嵌套层次。当一个函数调用了另一个函数，或着脚本，也会增加嵌套层次。今天分享一个函数，它能告诉你的脚本嵌套的层次：

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 function Test-NestLevel { $i = 1 $ok = $true do { try { $test = Get-Variable -Name Host -Scope $i } catch { $ok = $false } $i++ } While ($ok)   $i }

　　当你调用的函数具有递归调用时，上面的函数非常有用，来看一个调用的示例:

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 function Test-Diving { param($Depth)   if ($Depth -gt 10) { return }   "Diving deeper to $Depth meters..."   $currentDepth = Test-NestLevel "calculated depth: $currentDepth"   Test-Diving -depth ($Depth+1) }   Test-Diving -depth 1

　　当你运行Test-Diving时，函数会调用自己10次。函数使用一个参数来控制嵌套层次，而Test-NestLevel负责返回确切的深度数。

　　注意这里有个区别：Test-NestLevel返回绝对的嵌套层次，参数会纪录这个函数调用自己多少次。如果Test-Diving被嵌入到另外一个函数中，绝对深度和相对深度会不同。

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 PS C:> Test-Diving -Depth 1 diving deeper to 1 meters... calculated depth: 1 diving deeper to 2 meters... calculated depth: 2 diving deeper to 3 meters... calculated depth: 3 diving deeper to 4 meters... calculated depth: 4 diving deeper to 5 meters... calculated depth: 5 diving deeper to 6 meters... calculated depth: 6 diving deeper to 7 meters... calculated depth: 7 diving deeper to 8 meters... calculated depth: 8 diving deeper to 9 meters... calculated depth: 9 diving deeper to 10 meters... calculated depth: 10   PS C:> & { Test-Diving -Depth 1 } diving deeper to 1 meters... calculated depth: 2 diving deeper to 2 meters... calculated depth: 3 diving deeper to 3 meters... calculated depth: 4 diving deeper to 4 meters... calculated depth: 5 diving deeper to 5 meters... calculated depth: 6 diving deeper to 6 meters... calculated depth: 7 diving deeper to 7 meters... calculated depth: 8 diving deeper to 8 meters... calculated depth: 9 diving deeper to 9 meters... calculated depth: 10 diving deeper to 10 meters... calculated depth: 11   PS C:>

　　Test-NestLevel总会返回从当前代码的作用域到全局作用域的嵌套深度。