Mastering Windows PowerShell Scripting - Third Edition

The argument-completer attribute

The argument-completer attribute is used much like ValidateScript. The script block used previously is used as an argument for the attribute, shown as follows:

function Test-ArgumentCompleter {    [CmdletBinding()]    param (        [Parameter(Mandatory)]        [ArgumentCompleter( {            param ( $commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameter )            $possibleValues = 'Start', 'Stop', 'Create', 'Delete'            $possibleValues | Where-Object { $_ -like "$wordToComplete*" }        } )]        $Action    )}

When the user types Test-ArgumentCompleter and then presses Tab, the completer offers up each of the possible values with no filtering. If the user were to type Test-ArgumentCompleters, only start and stop would be offered when ...