Pass function as a parameter

Question

I've written function 'A' that will call one of a number of other functions. To save re-writing function 'A', I'd like to pass the function to be called as a parameter of function 'A'. For example:

function A{
    Param($functionToCall)
    Write-Host "I'm calling : $functionToCall"
}

function B{
    Write-Host "Function B"
}

Function C{
    write-host "Function C"
}

A -functionToCall C

Returns: I'm calling: C

I am expecting it to return: I'm calling: Function C.

I've tried various things such as:

Param([scriptblock]$functionToCall)

Cannot convert System.String to ScriptBlock

A -functionToCall $function:C

Returns "Write-Host "Function C"

A - functionToCall (&C)

This evaluates before the rest of it:

 Function C
 I'm Calling :

I'm sure this is programming 101, but I can't work out the correct syntax or what it is I'm doing wrong.

Answer 1

Is this what you need?

function A{
    Param($functionToCall)
    Write-Host "I'm calling : $functionToCall"

    #access the function-object like this.. Ex. get the value of the StartPosition property
    (Get-Item "function:$functionToCall").ScriptBlock.StartPosition

}

function B{
    Write-Host "Function B"
}

Function C{
    write-host "Function C"
}


PS> a -functionToCall c

I'm calling : c


Content     : Function C{
                  write-host "Function C"
              }
Type        : Position
Start       : 307
Length      : 43
StartLine   : 14
StartColumn : 1
EndLine     : 16
EndColumn   : 2