IIS 7.5 Application Pools / IIS Manager GUI column: Applications - powershell

Question

When looking in the IIS 7.5 manager > application pools, The last column lists "Applications". This column shows the number of application pools / websites this appPool is associated with.
I am trying to figure out how to query this column / information using Powershell. The end goal here is to have a script that I could run that would tell me if any applicaiton pool is being used for more than 1 website or app.
I am unable to find how to query this information, when running:
get-itemproperty IIS:\AppPools\(AppPoolName) | format-list *
I dont see this property. Im not sure that this column is a property, if not, is there a best way to check if AppPools are being used for more than 1 website / applicaiton?

Answer 1

The Applications property is defined in the format file, its code reside in the iisprovider.format.ps1xml file (in the webadmin module folder).
<TableColumnItem>
<ScriptBlock>
$pn = $_.Name
$sites = get-webconfigurationproperty "/system.applicationHost/sites/site/application[#applicationPool=`'$pn`'and #path='/']/parent::*" machine/webroot/apphost -name name
$apps = get-webconfigurationproperty "/system.applicationHost/sites/site/application[#applicationPool=`'$pn`'and #path!='/']" machine/webroot/apphost -name path
$arr = #()
if ($sites -ne $null) {$arr += $sites}
if ($apps -ne $null) {$arr += $apps}
if ($arr.Length -gt 0) {
$out = ""
foreach ($s in $arr) {$out += $s.Value + "`n"}
$out.Substring(0, $out.Length - 1)
}
</ScriptBlock>
</TableColumnItem>
You can take the code out and use it outside the format file, just assign $pn the apppool name you want to query. Here's a simplified version of the code:
$pn = 'pool1'
$sites = get-webconfigurationproperty "/system.applicationHost/sites/site/application[#applicationPool='$pn' and #path='/']/parent::*" machine/webroot/apphost -name name
$apps = get-webconfigurationproperty "/system.applicationHost/sites/site/application[#applicationPool='$pn' and #path!='/']" machine/webroot/apphost -name path
$sites,$apps | foreach {$_.value}

Answer 2

I went with this:
Import-Module WebAdministration
function Get-WebAppPoolApplications($webAppPoolName) {
$result = #()
$webAppPool = Get-Item ( Join-Path 'IIS:\AppPools' $webAppPoolName )
if ( $webAppPool -ne $null ) {
$webSites = Get-ChildItem 'IIS:\Sites'
$webSites | % {
$webApplications = Get-ChildItem ( Join-Path 'IIS:\Sites' $_.Name ) |
where { $_.NodeType -eq 'application' }
$result += $webApplications |
where { $_.applicationPool -eq $webAppPoolName }
}
}
$result
}

Answer 3

Wish I would have seen your post earlier, this is what I eventually came up with:
$SiteApps = get-item IIS:\Sites* $arraySize = ($SiteApps.count -1)
$i = 0
$t = 0
for ($i=0; $i -le $arraySize; $i ++) # start at the beg of the array
{
for ($t=($i+1); $t -le $arraySize; $t++)
{
if ($siteApps[$i].applicationpool -eq $siteApps[$t].applicationpool)
{
$web1 = $siteApps[$i].name
$webappPool = $siteApps[$i].applicationpool
$web2 = $siteApps[$t].name $answer = $answer + "The website "$web1" is sharing the AppPool "webAppPool" with website "$web2". "
}
}
}