PowerShell 相当于 cmd“IF %ERRORLEVEL% NEQ 0”

Question

寻找与此 cmd 错误检查等效的 PowerShell：

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IF %ERRORLEVEL% NEQ 0

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这是我试图编写的 PowerShell 代码：

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Write-Information "Installing .NET 3 from DVD:"\n$NetFX3_Source = "D:\\Sources\\SxS"\ndism /online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:$NetFX3_Source /NoRestart\nIF (****TheCommandYouTellMe****) {\nWrite-Information "DVD not found, installing from online sources, the Win default method"\nDISM.EXE /Online /Add-Capability /CapabilityName:NetFx3~~~~\nAdd-WindowsCapability \xe2\x80\x93Online -Name NetFx3~~~~\n}\n

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Answer 1

由于dism.exe是外部程序，您需要检查$LASTEXITCODE自动变量：

dism /online /andsoon
if($LASTEXITCODE -ne 0)
{
    # Add your capability
}