SOLVED: Find web sites and applications using a Microsoft IIS server application pool using the IISAdministration PowerShell cmdlets

If you're using the IISAdministration PowerShell module you may want to find out what applications are in use by an application pool.

(if you're using the older WebAdministration module I've written the solution here).

# Gets the names of the applications in the specified application pool.
Function Get-ApplicationPoolApplicationNames
{

    [CmdletBinding()]
    param(

        [Parameter()]
        [System.Object] $ApplicationPoolName
    )
    process
    {

        $applicationNames = New-Object System.Collections.Generic.List``1[System.String];
        $webSites = Get-IISSite;
        foreach ($webSite in $webSites)
        {    
            foreach ($application in $webSite.Applications)
            {
                if ($application.ApplicationPoolName -eq $ApplicationPoolName)
                {
                    if ($application.Path -eq "/")
                    {
                        $applicationNames.Add($webSite.Name);
                        continue;
                    }
                    $applicationNames.Add("$($webSite.Name)$($application.Path)");
                }    

            }
        }
        return $applicationNames;
    }
} 

The results are returned in the format

SiteName

or

SiteName\ApplicationName