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Conditional adding of Powershe…
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Conditional adding of Powershell snap-in to a script
posted on June 15th 2015, at 11:54
by
lunarg
When running multiple scripts in a session, which use and add the same snap-in using Add-PSSnapin, only the first one succeeds. Subsequent attempts to add the same snap-in will result in an error:
Error
Cannot add Windows PowerShell snap-in My.SnapIn because it is already added. Verify the name of the snap-in and try again.
You can resolve this issue by enclosing it in the following if-statement:
if ( (Get-PSSnapin -Name My.SnapIn -ErrorAction SilentlyContinue) -eq $null ){ Add-PsSnapin My.SnapIn}
It (silently) checks the presence of the requested snap-in. If it does not exist (i.e. the check returns $null, then it loads the snap-in.
Note: replace My.SnapIn with whatever snap-in you
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