Question Re:[Tutoriel]Création d'une complétion d'arguments

using namespace System.Management.Automation
using namespace System.Management.Automation.Language
using namespace System.Collections
using namespace System.Collections.Generic

class NumberCompleter : IArgumentCompleter 
{

    [int] $From
    [int] $To
    [int] $Step

    NumberCompleter([int] $from, [int] $to, [int] $step) 
    {
        if ($from -gt $to) {
            throw [ArgumentOutOfRangeException]::new("from")
        }
        $this.From = $from
        $this.To = $to
        $this.Step = if($step -lt 1) { 1 } else { $step }
    }

    [IEnumerable[CompletionResult]] CompleteArgument(
        [string] $CommandName,
        [string] $parameterName,
        [string] $wordToComplete,
        [CommandAst] $commandAst,
        [IDictionary] $fakeBoundParameters)
    {
        $resultList = [List[CompletionResult]]::new()
        $local:to = $this.To
        for ($i = $this.From; $i -le $to; $i += $this.Step) {
            if ($i.ToString().StartsWith($wordToComplete, [System.StringComparison]::Ordinal)) {
                $num = $i.ToString()
                $resultList.Add([CompletionResult]::new($num, $num, "ParameterValue", $num))
            }
        }

        return $resultList
    }
}

class NumberCompletionAttribute : ArgumentCompleterAttribute, IArgumentCompleterFactory
{
    [int] $From
    [int] $To
    [int] $Step

    NumberCompletionAttribute([int] $from, [int] $to)
    {
        $this.From = $from
        $this.To = $to
        $this.Step = 1
    }

    [IArgumentCompleter] Create() { return [NumberCompleter]::new($this.From, $this.To, $this.Step) }
}

function FactoryCompletionAdd {
    param(
        [NumberCompletion(0, 50, Step = 5)]
        [int] $Number
    )
}