Question

根据答案like this one和我自己的经验，Powershell可以自动处理传播-Verbose（和-Debug），这非常方便。但是，当我想要传播详细信息的函数位于模块中时，这将停止工作。用于测试此代码的代码：

在某处创建名为Mod的目录，假设在c：中，并添加2个文件：

档案c:\Mod\Functions.ps1：

function Show-VerbosityB { [cmdletbinding()]Param()
  Write-Output "Show-VerbosityB called"
  Write-Verbose "Show-VerbosityB is Verbose"
}

档案c:\Mod\Mod.psd1：

@{
ModuleVersion = '1.0.0.0'
NestedModules = @('Functions.ps1')
FunctionsToExport = @('*-*')
}

现在创建主脚本，说c:\Foo.ps1：

Import-Module c:\Mod

function Show-VerbosityA { [cmdletbinding()]Param()
  Write-Output "Show-VerbosityA called"
  Write-Verbose "Show-VerbosityA is Verbose"
}

function Show-Verbosity { [cmdletbinding()]Param()
  Write-Output "Show-Verbosity called"
  Write-Verbose "Show-Verbosity is Verbose"
  Write-Output "Testing propagation"
  Show-VerbosityA
  Show-VerbosityB
}

Show-Verbosity -Verbose

结果

PS> . C:\Foo.ps1
Show-Verbosity called
VERBOSE: Show-Verbosity is Verbose
Testing propagation
Show-VerbosityA called
VERBOSE: Show-VerbosityA is Verbose
Show-VerbosityB called

为什么跳过模块函数中的Write-Verbose，为什么传播行为不像Show-VerbosityA那样？（如果我只是点源Functions.ps1而不是导入模块，则打印行VERBOSE: Show-VerbosityB is Verbose）。我可以通过例如传播手册致电Show-VerbosityB -Verbose:$PSBoundParameters['Verbose']。或者还有其他更好的方式吗？如果函数的行为有所不同，这取决于它们是模块的一部分还是点源的。

Answer 1

发生这种情况的原因是因为调用模块时$VerbosePreference不会传播。我修改了您的脚本，以便通过Write-Verbose和Write-Output在输出的相同位置显式打印值。

This powershell.org post建议将此添加到模块中，这对我来说就像一个魅力：

if (-not $PSBoundParameters.ContainsKey('Verbose'))
{
    $VerbosePreference = $PSCmdlet.GetVariableValue('VerbosePreference')
}

_{其中一条评论提到带链接的错误报告（它不存在或我没有权限查看）}

问题是discussed in a TechNet post，a link to a Get-CallerPreferance function解决了这个问题。

<强>模块：

function Show-VerbosityB { [cmdletbinding()]Param()

    <# uncomment to get verbose preference from caller, when verbose switch not explicitly used.
    if (-not $PSBoundParameters.ContainsKey('Verbose'))
    {
        $VerbosePreference = $PSCmdlet.GetVariableValue('VerbosePreference')
    }
    #>

    Write-Output "`nShow-VerbosityB called"
    Write-output "Global pref: $($global:VerbosePreference)"
    Write-output "Script pref: $($script:VerbosePreference)"
    Write-output "Effect pref: $VerbosePreference"
    Write-Verbose "Show-VerbosityB is Verbose"
}

<强>号码：

Import-Module C:\Mod

Write-output "On startup: $VerbosePreference"

function Show-VerbosityA { [cmdletbinding()]Param()
  Write-Output "`nShow-VerbosityA called"
  Write-output "Global pref: $($global:VerbosePreference)"
  Write-output "Script pref: $($script:VerbosePreference)"
  Write-output "Effect pref: $VerbosePreference"
  Write-Verbose "Show-VerbosityA is Verbose"
}

function Show-Verbosity { [cmdletbinding()]Param()
  Write-Output "`nShow-Verbosity called"
  Write-output "Global pref: $($global:VerbosePreference)"
  Write-output "Script pref: $($script:VerbosePreference)"
  Write-output "Effect pref: $VerbosePreference"
  Write-Verbose "Show-Verbosity is Verbose"
  Write-Output "`nTesting propagation"
  Show-VerbosityA
  Show-VerbosityB
}

Show-Verbosity -Verbose

Answer 2

如果要通过调用者脚本进行设置，请尝试以下操作：

（Get-Module'ModuleName'）。SessionState.PSVariable.Set（'Global：VerbosePreference'，$ VerbosePreference）

如何传播-Verbose到模块函数？

2 个答案: