Use ValidateSet with the contents loaded from a CSV file

Question

I really like the way that ValidateSet works. It proposes the options as a list while you type your Cmdlet in the PowerShell ISE.

I would like to know if i

Answer 1

I prefer TabExpansion++ module though this doesn't technically validate, it has some nice functionality...

Here's an example of an msbuild overloaded command to add some intellisense for projects

Register-ArgumentCompleter -CommandName "msbuild" -ParameterName "target" -ScriptBlock {
    param($commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameter)

    $projectName = $fakeBoundParameter['project']
    $projectFile = Join-Path (Get-Location) $projectName
    $projectXml = [xml](Get-Content $projectFile)

    $targets = $projectXml.Project.Target | Where-Object { $_.Name.ToString().StartsWith($wordToComplete) }
    foreach($target in $projectXml.Project.Target)
    {
        New-CompletionResult -CompletionText "$($target.Name)"
    }
}

Answer 2

Here is something you can start with:

function New-Name {
    param (
        [parameter(Position=0, Mandatory=$true)]
        [String]$Name
    )

    dynamicparam {
        $attributes = new-object System.Management.Automation.ParameterAttribute
        $attributes.ParameterSetName = "__AllParameterSets"
        $attributes.Mandatory = $true
        $attributeCollection = new-object -Type System.Collections.ObjectModel.Collection[System.Attribute]
        $attributeCollection.Add($attributes)
        $values = @('MailBox', 'Tralala', 'Trilili') # your Import-Csv here
        $ValidateSet = new-object System.Management.Automation.ValidateSetAttribute($values)
        $attributeCollection.Add($ValidateSet)

        $dynParam1 = new-object -Type System.Management.Automation.RuntimeDefinedParameter("Type", [string], $attributeCollection)
        $paramDictionary = new-object -Type System.Management.Automation.RuntimeDefinedParameterDictionary
        $paramDictionary.Add("Type", $dynParam1)
        return $paramDictionary 
    }

     process { 'Foo' }
}

Credits where credits are due, this largely comes from the following article from the Scripting Guy. The code isn't pretty, but it does what you want.