powershell select-object expression with a function with parameters [duplicate]

Question

how can i pass 2 parameters to a function in an expression?

function somefunkystuff ($p1, $p2)
{
    #both passed values are available, just not as expected
    #why are the parameters in the calling Expression passed to $p1 as an array instead of just to both parameters $p1 and $p2?
    #return $p1.ToString() + $p2.ToString() # doesn't work as expected

    return $p1[0].ToString() + $p1[1].ToString()
    
}
$a = [PSCustomObject]@{MyName="jef"; Number=1}
$b = [PSCustomObject]@{MyName="john"; Number=2}
$c = [PSCustomObject]@{MyName="jonas"; Number=3}

@($a, $b, $c) | Select-Object MyName, Number, @{Name="NameId"; Expression={ somefunkystuff( $_.MyName, $_.Number) }}

Don't use brackets around the parameters for your function and also remove the comma in between: Expression={ somefunkystuff $_.MyName $_.Number}}, then just have it return the values $p1 and $p2 — Theo
– Theo, Commented Feb 3, 2024 at 16:02
In short: PowerShell functions, cmdlets, scripts, and external programs must be invoked like shell commands - foo arg1 arg2 - not like C# methods - foo('arg1', 'arg2'). If you use , to separate arguments, you'll construct an array that a command sees as a single argument. — mklement0
– mklement0, Commented Feb 3, 2024 at 16:34

Luuk · Accepted Answer · 2024-02-03 16:02:09Z

2

see: How do I pass multiple parameters into a function in PowerShell?

and change your code to:

return $p1[0].ToString() + $p1[1].ToString() changed to return $p1 + $p2
Expression={ somefunkystuff( $_.MyName, $_.Number) } change to Expression={ somefunkystuff $_.MyName $_.Number }

function somefunkystuff ($p1, $p2)
{
    #both passed values are available, just not as expected
    #why are the parameters in the calling Expression passed to $p1 as an array instead of just to both parameters $p1 and $p2?
    #return $p1.ToString() + $p2.ToString() # doesn't work as expected

    return $p1 + $p2
    
}
$a = [PSCustomObject]@{MyName="jef"; Number=1}
$b = [PSCustomObject]@{MyName="john"; Number=2}
$c = [PSCustomObject]@{MyName="jonas"; Number=3}

@($a, $b, $c) | Select-Object MyName, Number, @{Name="NameId"; Expression={ somefunkystuff  $_.MyName $_.Number }}

output:

MyName Number NameId
------ ------ ------
jef         1 jef1
john        2 john2
jonas       3 jonas3

answered Feb 3, 2024 at 16:02

Luuk

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1 Comment

sotto Over a year ago

thank you (certainly for the reference to the other post!)

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