How to check if PowerShell snap-in is already loaded before calling Add-PSSnapin

Question

I have a group of PowerShell scripts that sometimes get run together, sometimes one at a time. Each of the scripts requires that a certain snap-in be loaded.

Right n

Answer 1

I tried @ScottSaad's code sample but it didn't work for me. I haven't found out exactly why but the check was unreliable, sometimes succeeding and sometimes not. I found that using a Where-Object filtering on the Name property worked better:

if ((Get-PSSnapin | ? { $_.Name -eq $SnapinName }) -eq $null) {
    Add-PSSnapin $SnapinName 
}

Code courtesy of this.