DynamicParam.snippets.ps1xml

<?xml version='1.0' encoding='utf-8' ?>
    <Snippets  xmlns='http://schemas.microsoft.com/PowerShell/Snippets'>
        <Snippet Version='1.0.0'>
            <Header>
                <Title>DynamicParam</Title>
                <Description></Description>
                <Shortcut></Shortcut>
                <Keywords>editor,console</Keywords>
                <Author></Author>
                <DifficultyLevel>1</DifficultyLevel>
                <Example>False</Example>
                <SnippetTypes>
                    <SnippetType>Expansion</SnippetType>
                </SnippetTypes>
                <Requirements>
                    <MinimumPowerShellVersion>3</MinimumPowerShellVersion>
                    <RequiredModules></RequiredModules>
                    <AdminPrivileges>False</AdminPrivileges>
                    <ProcessorArchitecture>x64</ProcessorArchitecture>
                </Requirements>
            </Header>

            <Code>
                <Script Language='PowerShell' CaretOffset='1021'>
                    <![CDATA[[CmdletBinding()]
param
()
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)
$_Values = Get-WmiObject -Class win32_volume| Where-Object -FilterScript {$_.DriveLetter -NE $null} | Select-Object -ExpandProperty DriveLetter
$ValidateSet =new-object System.Management.Automation.ValidateSetAttribute($_Values)
$attributeCollection.Add($ValidateSet)
$dynParam1 =new-object -Type System.Management.Automation.RuntimeDefinedParameter("DriveLetter", [string], $attributeCollection)
$paramDictionary =new-object -Type System.Management.Automation.RuntimeDefinedParameterDictionary
$paramDictionary.Add("DriveLetter", $dynParam1)
return $paramDictionary
}

process{
$DriveLetter = $PSBoundParameters.DriveLetter
Write-output (get-item $DriveLetter)
}]]>
                </Script>
            </Code>

    </Snippet>
</Snippets>