Question

I’m defining a function in PowerShell and trying to call it as shown below.

function foo([Int32] $a, [Int32] $b)
{
}
foo(0,0)

When I do this, I get the following error.

foo : Cannot process argument transformation on parameter 'a'. Cannot convert the "System.Object[]" value of type "System.Object[]" to type
 "System.Int32".
At line:1 char:4
+ foo <<<< (0,0)
    + CategoryInfo          : InvalidData: (:) [foo], ParameterBindin...mationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,foo

If I change the function to only accept a single argument as shown below it works fine.

function foo([Int32] $a)
{
}
foo(0)

Or, if I remove the type info it also works as shown below.

function foo($a, $b)
{
}
foo(0,0)

What’s wrong with the first version? How do I properly define a function which takes multiple integer arguments?

EDIT: Interestingly, the following invocation does work.

foo 0 0

I’d prefer the ()s though and am wondering how to get it to work with those.

Answer 1

In powershell parameters are passed without parenthesis try:

foo 0 0

doing

foo(0,0)

you are passing an object array as first parameter.

You can pass the array and then split each value as parameter inside the script, but why do it?