PowerShell: Load WebAdministration in ps1 script on both IIS 7 and IIS 7.5

Question

I have a PowerShell script that configures web site and web application settings in IIS. So I use the cmdlets in the WebAdministration snap in. But this script needs to run on

Answer 1

I ran into this problem today and here is solution I used

Add-PSSnapin WebAdministration -ErrorAction SilentlyContinue

Import-Module WebAdministration -ErrorAction SilentlyContinue

The only situation this does not work in was if the iis powershell snapin is not installed at all.

Answer 2

Another way using Windows version:

if ([System.Version](Get-ItemProperty -path "HKLM:\Software\Microsoft\Windows NT\CurrentVersion").CurrentVersion -ge [System.Version] "6.1")
{ Import-Module WebAdministration }
else
{ Add-PSSnapin WebAdministration }

Answer 3

This is probably a bit late to help you, but here is how we do this:

$iisVersion = Get-ItemProperty "HKLM:\software\microsoft\InetStp";
if ($iisVersion.MajorVersion -eq 7)
{
    if ($iisVersion.MinorVersion -ge 5)
    {
        Import-Module WebAdministration;
    }           
    else
    {
        if (-not (Get-PSSnapIn | Where {$_.Name -eq "WebAdministration";})) {
            Add-PSSnapIn WebAdministration;
        }
    }
}

Answer 4

Is it possible to catch the error from one or the other, and do the opposite. Dont have my shell handy but something like:

$succeeded = import-module WebAdministration
if (($succeeded -ne $null) -and ($succeeded.GetType() -eq [System.Exception]) {
  #Could not import, trying to snapin
  add-pssnapin WebAdministration
}

Actually thinking about this a bit more...

$hasSnapin = get-pssnapin | Select { $_.Name.toLower().Trim() = "webadministration" }
if ($hasSnapin -ne $null) {
  add-pssnapin WebAdministration
} else {
  import-module WebAdministration
}

On the first one, I know the error type check will probably need to be modified. As far as the work going on, this can actually be done in C# by looking in the registry for loaded snapins, or the IIS version installed on the machine and then use the appropriate method.

Answer 5

If you want to create "pre-configured" PowerShell sessions, look into PowerShell console files e.g.:

man Export-Console -full

You can create one for use on Win7 and Server 2008 R2 and another for use on Server08.

Answer 6

This is great. All I had to do was add an else so it would add the snap-in when run on Windows 2008. This works in scripts for my situation.

Function Load-WebAdmin {
  $webAdminModule = get-module -ListAvailable | ? { $_.Name -eq "webadministration" }
  If ($webAdminModule -ne $null) {
    import-module WebAdministration
  }else{
    Add-pssnapin WebAdministration
   }
}