How to print the powershell cmdlet arguments inside the cmdlet class

Question

Could someone help me log the actual PowerShell command issued along with arguments.

I have a cmdlet implemented in C# as follows

class GetMyCommand : PSCmdlet
{
    // parameter definitions
    ...

    void processRecord()
    {
        // Here I want print actual arguments passed to the cmdlet.
    }
}

if someone calls

Get-MyCommand -Name Hello -File "test.txt"

I just want to log the command in the processRecord function.

 "Get-MyCommand -Name Hello -File "test.txt""

Clearly I know the cmdlet name, but not sure how to print the exact string of arguments.

Environment.CommandLine works inside regular exes, but how to do the same in cmdlets

Thanks

Answer 1

Use the MyInvocation.Line property on PSCmdlet e.g.:

void ProcessRecord() {
    var line = this.MyInvocation.Line
}

Answer 2

Have a look at the InvocationInfo object available as MyInvocation member on PSCmdlet. It provides info like Line, BoundParameters etc that will be of use to you.

http://msdn.microsoft.com/en-us/library/system.management.automation.invocationinfo_members(v=vs.85).aspx

Answer 3

I'll add a caveat to $PSCmdlet.MyInvocation.Line:

It only knows the SINGLE line that was passed in. I use it to get a count from the pipeline in my Get-MailboxTrustee.ps1 script, and I've discovered that while this works great:

$Mailboxes | .\Get-MailboxTrustee.ps1

This does not:

$Mailboxes |
.\Get-MailboxTrustee.ps1

If you inspect $PSCmdlet.MyInvocation.Line in this second example, you will see that it is just:

.\Get-MailboxTrustee.ps1 (completely missing the $Mailboxes | <new line> portion of my command)

Too bad there isn't a $PSCmdlet.MyInvocation.Line[s]. We know that PowerShell is obviously aware, so $PSCmdlet's implementation seems to be where the lack is.