PowerShell相当于cmd“IF％ERRORLEVEL％NEQ 0”

Question

查找与此cmd错误检查相对应的PowerShell：

IF %ERRORLEVEL% NEQ 0

以下是我要编写的PowerShell代码：

Write-Information "Installing .NET 3 from DVD:"
$NetFX3_Source = "D:\Sources\SxS"
dism /online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:$NetFX3_Source /NoRestart
IF (****TheCommandYouTellMe****) {
Write-Information "DVD not found, installing from online sources, the Win default method"
DISM.EXE /Online /Add-Capability /CapabilityName:NetFx3~~~~
Add-WindowsCapability –Online -Name NetFx3~~~~
}

Answer 1

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

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