List webapplications in IIS with powershell - powershell

Question

The first sorry for my english, but I need your help with powershell scripting.
I must config IIS server with powershell script and I have problem with "add application". I need to check whether webapplication exist in site. I want
choose all webapplication in site "testsite2"
$webapplication=Get-WebApplication | Where-Object {$_. applicationpool -eq "testsite2"} | select -expand Name;
But I have problem that command is ending with error
select : Property "Name" cannot be found.At line:1 char:75 Get-WebApplication | Where-Object {$_. applicationpool -eq "testsite2"} | select ... CategoryInfo : InvalidArgument: (Microsoft.IIs.P...gurationElement:PSObject) [Select-Object], PSArgumentException FullyQualifiedErrorId : ExpandPropertyNotFound,Microsoft.PowerShell.Commands.SelectObjectCommand
I don´t understand. What have I do when I want choose value from column "Name"?
I get same result
Get-ChildItem –Path IIS:\AppPools\ | Where-Object {$_. Name -eq "testsite2"} | select -ExpandProperty applications
result:
select : Property "applications" cannot be found.
At line:1 char:80
Get-ChildItem –Path IIS:\AppPools\ | Where-Object {$_. Name -eq "testsite2"} | s ...
CategoryInfo : InvalidArgument: (Microsoft.IIs.P...gurationElement:PSObject) [Select-Object], PSArgumentException
FullyQualifiedErrorId : ExpandPropertyNotFound,Microsoft.PowerShell.Commands.SelectObjectCommand

Answer 1

The WebAdministration module can be a bit deceiving in that it uses custom formatting data to show stuff like Name with Format-Table (even though the underlying objects have no Name property).
To get the equivalent Name value, take the Path property and trim /:
$WebAppNames = Get-WebApplication |Select #{Name='Name';Expression={$_.Path.Trim('/')}} |Select -Expand Name
The above is exactly what the formatting subsystem in PowerShell does to calculate the Name value.
You can explore the actual properties an object has with the Get-Member cmdlet:
Get-WebApplication |Get-Member
This will also show you the type name, which you can use to explore any additional Type- or Format-Data that might apply:
Get-TypeData -TypeName 'Microsoft.IIS.PowerShell.Framework.ConfigurationElement#site#application'
Get-FormatData -TypeName 'Microsoft.IIS.PowerShell.Framework.ConfigurationElement#site#application'