Using Invoke-Command -ScriptBlock on a function with arguments

Question

I'm writing a PowerShell script that will execute commands on a remote host using Invoke-Command and its -ScriptBlock parameter. For example,

function Foo {     ...     return "foo" } $rv = Invoke-Command --Credential $c --ComputerName $fqdn -ScriptBlock ${function:Foo} 

This works fine. What I'd like to do now is the same thing, but call a function with local arguments. For example,

function Bar {     param( [String] $a, [Int] $b )     ...     return "foo" } [String] $x = "abc" [Int] $y = 123 $rv = Invoke-Command --Credential $c --ComputerName $fqdn -ScriptBlock ${function:Foo($x,$y)} 

But this does not work:

Invoke-Command : Cannot validate argument on parameter 'ScriptBlock'. The argument is null. Supply a non-null argument and try the command again.

How can I use Invoke-Command with a -ScriptBlock that is a local function with arguments?

I realize that I can wrap the entire function and the parameters in a big code block, but that is not a clean way of doing it, in my opinion.

Answer 1

I think you want:

function Foo ( $a,$b) {     $a     $b     return "foo" }  $x = "abc" $y= 123  Invoke-Command -Credential $c -ComputerName $fqdn -ScriptBlock ${function:Foo} -ArgumentList $x,$y 

Answer 2

You can wrap the functions in a block and pass the block;

$a = {   function foo{}   foo($args) }  $a.invoke() // Locally  $rv = Invoke-Command --Credential $c --ComputerName $fqdn -ScriptBlock $a //remotely 

It's hardly elegant though.