Powershell Script to export VMs with dynamic parameters

Export-MyVM.ps1

<#
.SYNOPSIS
    The Function Export-MyVM extends the standard cmdlet Export-VM with dynamic parameters.
.DESCRIPTION
    The Script makes the search for the VMs and the Export-Destination-Drive dynamic.
    You can simply tab through the two mandatory parameters to get (a) all VMs on the Hyper-V-Host and (b) all connected drives.
    Frankly, the main purpose was to learn dynamic parameters.
.PARAMETER VMName
    Tab out all VMs on the Hyper-V-Host.
    It's a positional (1) and mandatory parameter.
.PARAMETER Disk
    Tab out all Disks on the Hyper-V-Host to find your preferred backup-destination
    It's a positional (2) and mandatory parameter.
.EXAMPLE
    Export-MyVM -VMName <Value> -Disk <Value>
.NOTES
    Author: Oliver Jäkel | oj@jaekel-edv.de | @JaekelEDV
#>
function Export-MyVM
{
    #region Parameter Section
    [CmdletBinding(
        SupportsShouldProcess = $true
    )]
    Param()

    DynamicParam
    { #Dynamic Parameters require 4 objects:
        #1 - Runtime defined Parameter Dictionary
        #2 - Attribute Collection
        #3 - ParamaterAttribute
        #4 - Runtime Defined Parameter

        #Declare the first dynamic parameter
        $ParameterName1 = 'VMName'

        #1 - Create the dictionary, i.e. a container where the dynamic parameters will be stored
        $RuntimeParameterDictionary = New-Object System.Management.Automation.RuntimeDefinedParameterDictionary

        #2 - Create the collection of attributes, i.e. a container where System.Attribute objects will be stored
        $AttributeCollection = New-Object System.Collections.ObjectModel.Collection[System.Attribute]

        #3a - Create and set the parameters' attributes
        $ParameterAttribute = New-Object System.Management.Automation.ParameterAttribute
        $ParameterAttribute.Mandatory = $true
        $ParameterAttribute.Position = 1

        #3b - Add the attributes to the attributes collection
        $AttributeCollection.Add($ParameterAttribute)

        #3c - Create and set the ValidateSet, i.e. the dynamically values our parameters might have
        $arrSet = Get-VM | Select-Object -ExpandProperty Name
        $ValidateSetAttribute = New-Object System.Management.Automation.ValidateSetAttribute($arrSet)

        # Add the ValidateSet to the attributes collection
        $AttributeCollection.Add($ValidateSetAttribute)

        #4 - Now it's time to create the dynamic parameters and put them in the dictionary
        $RuntimeParameter = New-Object System.Management.Automation.RuntimeDefinedParameter($ParameterName1, [string], $AttributeCollection)
        $RuntimeParameterDictionary.Add($ParameterName1, $RuntimeParameter)

        #And now the ugly part of this solution: for a second dynamic parameter you'll have to start all over...

        #Declare the second dynamic parameter
        $ParameterName2 = 'Disk'
        $AttributeCollection = New-Object System.Collections.ObjectModel.Collection[System.Attribute]
        $ParameterAttribute = New-Object System.Management.Automation.ParameterAttribute
        $ParameterAttribute.Mandatory = $true
        $ParameterAttribute.Position = 2
        $AttributeCollection.Add($ParameterAttribute)
        $arrSet = Get-CimInstance -ClassName Win32_LogicalDisk | Select-Object -ExpandProperty DeviceID
        $ValidateSetAttribute = New-Object System.Management.Automation.ValidateSetAttribute($arrSet)
        $AttributeCollection.Add($ValidateSetAttribute)
        $RuntimeParameter = New-Object System.Management.Automation.RuntimeDefinedParameter($ParameterName2, [string], $AttributeCollection)
        $RuntimeParameterDictionary.Add($ParameterName2, $RuntimeParameter)

        return $RuntimeParameterDictionary
        #endregion
    }

    begin
    #region Check and import Hyper-V Module
    {
        $LoadedModules = (Get-Module).Name
        if ($LoadedModules -notcontains 'Hyper-V')
        {Import-Module Hyper-V
        }
        else
        {write-host 'Hyper-V Module already loaded' -ForegroundColor Yellow
        }
        #endregion

    }
    process
    #region Export-VM
    {   $VMName = $PsBoundParameters[$ParameterName1]
        $Disk = $PsBoundParameters[$ParameterName2]
        Export-VM -Name $VMName -Path $Disk
    }
    #endregion
    end
    {
        #no end processing needed
    }
}