PowerShell 技能连载 - 进度条技巧(第 1 部分)

PowerShell自带内置进度条。通常情况下,当脚本完成时,它会自动消失:

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Write-Progress -Activity 'I am busy' -Status 'Step A'
Start-Sleep -Seconds 2
Write-Progress -Activity 'I am busy' -Status 'Step B'
Start-Sleep -Seconds 2

如果您想在脚本仍在运行时关闭进度条,则需要使用“-Completed”开关参数:

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Write-Progress -Activity 'I am busy' -Status 'Step A'
Start-Sleep -Seconds 2
Write-Progress -Activity 'I am busy' -Status 'Step B'
Start-Sleep -Seconds 2
Write-Progress -Completed -Activity 'I am busy'
Write-Host 'Progress bar closed, script still running.'
Start-Sleep -Seconds 2

如您所见,关闭进度条需要同时指定“-Activity”参数,因为它是一个强制性的参数。但是,如果您只想关闭所有可见的进度条,则“-Activity”参数的值并不重要。你可以提交一个空格或数字等任何值(除了null值或空字符串),因为这些都不会被强制性参数接受。

写入以下代码以定义“- Activity” 参数的默认值:

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Write-Progress -Activity 'I am busy' -Status 'Step A'
Start-Sleep -Seconds 2
Write-Progress -Activity 'I am busy' -Status 'Step B'
Start-Sleep -Seconds 2
Write-Progress -Completed -Activity ' '
Write-Host 'Progress bar closed, script still running.'
Start-Sleep -Seconds 2

写入以下代码以定义 “-Activity“ 参数的默认值:

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$PSDefaultParameterValues['Write-Progress:Activity']='xyz'  

现在,”Write-progress“ 将接受 “Completed“ 参数而无需提交 “Activity“ 参数:

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Write-Progress -Activity 'I am busy' -Status 'Step A'
Start-Sleep -Seconds 2
Write-Progress -Activity 'I am busy' -Status 'Step B'
Start-Sleep -Seconds 2
Write-Progress -Completed # due to the previously defined new default value, -Activity can now be omitted
Write-Host 'Progress bar closed, script still running.'
Start-Sleep -Seconds 2

PowerShell 技能连载 - 进度条技巧(第 1 部分)

http://blog.vichamp.com/2023/05/11/progress-bar-tricks-part-1/

作者

吴波

发布于

2023-05-11

更新于

2023-05-22

许可协议

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