PowerShell Invoke Member Helper

function Invoke-Member
{
    ##############################################################################
    ##
    ## Invoke-Member
    ##
    ## From Windows PowerShell Cookbook (O'Reilly)
    ## by Lee Holmes (http://www.leeholmes.com/guide)
    ##
    ##############################################################################

    <#

    .SYNOPSIS

    Enables easy access to methods and properties of pipeline objects.

    .EXAMPLE

    PS > "Hello","World" | .\Invoke-Member Length
    5
    5

    .EXAMPLE

    PS > "Hello","World" | .\Invoke-Member -m ToUpper
    HELLO
    WORLD

    .EXAMPLE

    PS > "Hello","World" | .\Invoke-Member Replace l w
    Hewwo
    Worwd

    #>

    [CmdletBinding(DefaultParameterSetName= "Member")]
    param(

        ## A switch parameter to identify the requested member as a method.
        ## Only required for methods that take no arguments.
        [Parameter(ParameterSetName = "Method")]
        [Alias("M","Me")]
        [switch] $Method,

        ## The name of the member to retrieve
        [Parameter(ParameterSetName = "Method", Position = 0)]
        [Parameter(ParameterSetName = "Member", Position = 0)]
        [string] $Member,

        ## Arguments for the method, if any
        [Parameter(
            ParameterSetName = "Method", Position = 1,
            Mandatory = $false, ValueFromRemainingArguments = $true)]
        [object[]] $ArgumentList = @(),

        ## The object from which to retrieve the member
        [Parameter(ValueFromPipeline = $true)]
        $InputObject
        )

    process
    {
        ## If the user specified a method, invoke it
        ## with any required arguments.
        if($psCmdlet.ParameterSetName -eq "Method")
        {
            $inputObject.$member.Invoke(@($argumentList))
        }
        ## Otherwise, retrieve the property
        else
        {
            $inputObject.$member
        }
    }
}