How can I build an array of properties to pass into Invoke-Command in Powershell?

Question

I need to use Invoke-Command to execute Powershell script blocks on remote machines that are on/off the domain.

I have something like the following below:

Invoke-Command -ComputerName $targetServer -ArgumentList @($selectedProjects, $targetURI, $buildRetention) -ScriptBlock $cleanupSB -Credential $PSCred

The property "-Credential $PSCred" is only needed when I want to execute on a machine off the domain, and so I'd like to dynamically construct the properties that are used with "Invoke-Command"

I tried to create an array such as:

$prop = @("-Credential", "`$PSCred")
Invoke-Command -ComputerName $targetServer -ArgumentList @($selectedProjects, $targetURI, $buildRetention) -ScriptBlock $cleanupSB $($prop)

However, this is not interpreted as I intended. Is there a I can dynamically create these arguments and use them with Invoke-Command? Thanks!

I know it's not what you're looking for, but couldn't you just check if the machine is on the domain and then do something like If(Machine is on domain){Invoke-Command}Else{Invoke-Command with creds}? — TheMadTechnician
– TheMadTechnician, Commented Jul 2, 2014 at 22:03
@TheMadTechnician Yes, that is what I have now. But imagine if I have multiple scriptblocks with multiple Invoke-Command expressions. Now that conditional statement starts to get repetitive.. — Ci3
– Ci3, Commented Jul 2, 2014 at 22:05
Not if you make it a function. That's one reason why we have functions, to avoid repetition. — TheMadTechnician
– TheMadTechnician, Commented Jul 2, 2014 at 22:09
You can use splatting to construct conditional parameter lists. — Bill_Stewart
– Bill_Stewart, Commented Jul 2, 2014 at 22:11
That's a better option, you should add that as an answer @Bill_Stewart — TheMadTechnician
– TheMadTechnician, Commented Jul 2, 2014 at 22:12

Bill_Stewart · Accepted Answer · 2014-07-02 22:16:10Z

3

You can use splatting to construct conditional parameter lists.

You can also view this topic at the PowerShell prompt:

PS C:\> help about_Splatting

answered Jul 2, 2014 at 22:16

Bill_Stewart

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