在继续之前，如何让Powershell等到命令完成？

Question

My script uninstalls a Windows Store app before installing the newer version. I need to make sure the uninstall is finished before installing, so how can I make sure I've waited long enough?

Remove-Appxpackage MyAppName  
# ~wait here~  
Add-Appxpackage .\PathToNewVersion

Answer 1

You can do this with the Start-Job and Wait-Job cmdlets:

Start-Job -Name Job1 -ScriptBlock { Remove-Appxpackage MyAppName }
Wait-Job -Name Job1
Add-Appxpackage .\PathToNewVersion

Start-Job will start a new job process that uninstalls the application. Wait-Job will then cause the script to wait until the task is completed before continuing.