PowerShell 技能连载 - 在输出中使用系统的错误颜色

适用于 PowerShell 所有版本

如果您的脚本希望输出警告或错误信息，您可以使用 Write-Warning 或 Write-Error 指令。两个 cmdlet 都会使用缺省的 PowerShell 颜色来显示警告和错误。然而，这两个 cmdlet 也会为您的输出结果套用一个文字模板：

PS> Write-Warning -Message 'This  is a warning'
WARNING: This is a warning

PS> Write-Error -Message  'Something went wrong'
Write-Error -Message 'Something went wrong'  : Something went wrong
    +  CategoryInfo          : NotSpecified: (:)  [Write-Error], WriteErrorException
    +  FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException

Write-Error 添加了一堆无意义的异常详细信息，而您所需要的只是错误文本。一个更好的方式是：

PS>  $host.UI.WriteErrorLine('Something went wrong...')
Something went wrong...

警告和错误的颜色可以通过这种方式配置：

PS>  $host.UI.WriteErrorLine('Something went wrong...')
Something went wrong...

PS> $host.PrivateData.ErrorBackgroundColor  = 'White'

PS>  $host.UI.WriteErrorLine('Something went wrong...')
Something  went wrong...

PS> $host.PrivateData

(...)
ErrorForegroundColor                      : #FFFF0000
ErrorBackgroundColor                      : #FFFFFFFF
WarningForegroundColor                    : #FFFF8C00
WarningBackgroundColor                    : #00FFFFFF
VerboseForegroundColor                    : #FF00FFFF
VerboseBackgroundColor                    : #00FFFFFF
DebugForegroundColor                      : #FF00FFFF
DebugBackgroundColor                      : #00FFFFFF
(...)