Why alias does not work?

PowerShell Help
1

Hi Everyone! Thanks at first!

I have an Issue, I don’t understand this behavior.

My Function Get-Test2 tell me the Manufacture, examples:

PS C:\> Get-Test2 127.0.0.1

Computername Manufacturer

127.0.0.1 Dell Inc.

It’s OK, this is what I want

PS C:\> "127.0.0.1" | Get-Test2

Computername Manufacturer

127.0.0.1 Dell Inc.

It’s OK

But, from the Pipeline Of a Get-adcomputer command.

PS C:\> Get-ADComputer test | Get-Test2

Computername Manufacturer

CN=test,CN=Computers,DC=R,DC=LAN Dell Inc.

I get

DistinguishedName : CN=SI,CN=Computers,DC=R,DC=LAN, I don’t want DistinguishedName, I want DNSHostname

I put an alias, but appears It doesn’t work.

This is my Psrameter:

        [Parameter(Mandatory=$true,
                   ValueFromPipeline=$true,
                   ValueFromPipelineByPropertyName=$true,
                   Position=0)]
                   [Alias("DNSHostname")]
                [string]$DNSHost

Can anyone explain me this behavior?

Thanks!

2

In short, the AD cmdlets are weird, and don’t always play well with being piped directly into other commands. (Particularly those that use aliases.)

Any easy workaround is to stick a call to Select-Object in the middle:

Get-ADComputer test | Select-Object -Property * | Get-Test2

It looks weird, but it works. Select-Object converts the objects that the AD cmdlet outputs into simple PSObjects with the same properties / values, and those PSObjects work fine when piped into other functions.

3

You are right! It WORKS! But looks weird.

Thanks