powershell - 如何为使用动态参数的高级函数 cmdlet 创建包装器

Question

我正在尝试为 Pester 的 Should 创建一个包装器(代理)命令。可能的用例包括 transparent logging of test input even in case of success和 improve the way Pester logs objects of certain types, e. g. hashtable .

因为 Should 是一个高级函数，所以通过 $args splatting 转发参数是行不通的。

所以我尝试使用 System.Management.Automation.ProxyCommand::Create() 生成包装器，如 this answer 所述:

$cmd = Get-Command Should
$wrapperSource = [System.Management.Automation.ProxyCommand]::Create( $cmd )
$wrapperSource >should_wrapper.ps1

调用包装器时，Powershell 输出此错误消息:

Should: Parameter set cannot be resolved using the specified namedparameters. One or more parameters issued cannot be used together oran insufficient number of parameters were provided.

看起来包装器生成器不理解 dynamicparam declaration of Should .

如何在不复制 Pester 代码的情况下为 Pester 的应该编写通用包装器？

Answer 1

It looks like the wrapper generator doesn't understand the dynamicparam declaration of Should.

默认情况下，包装器生成器省略 dynamicparam。幸运的是，这可以通过一些模板轻松解决:

$cmd = Get-Command Should
$pct = [System.Management.Automation.ProxyCommand]
$wrapperSource = @(
  $pct::GetCmdletBindingAttribute($cmd)
  'param('
    $pct::GetParamBlock($cmd)
  ')'
  'dynamicparam {'
    $pct::GetDynamicParam($cmd)
  '}'
  'begin {'
    $pct::GetBegin($cmd)
  '}'
  'process {'
    $pct::GetProcess($cmd)
  '}'
  'end {'
    $pct::GetEnd($cmd)
  '}'
) -join [Environment]::NewLine