sample powershell function with multiple dynamic parameters

New-VMDeploy.ps1

Function New-VMDeploy {
    [CmdletBinding()]

    Param()

    DynamicParam {
        
        
        # Set the dynamic parameters' name
        $ParamName_portgroup = 'PortGroup'
        # Create the collection of attributes
        $AttributeCollection = New-Object System.Collections.ObjectModel.Collection[System.Attribute]
        # Create and set the parameters' attributes
        $ParameterAttribute = New-Object System.Management.Automation.ParameterAttribute
        $ParameterAttribute.Mandatory = $true
        $ParameterAttribute.Position = 1
        # Add the attributes to the attributes collection
        $AttributeCollection.Add($ParameterAttribute) 
        # Create the dictionary 
        $RuntimeParameterDictionary = New-Object System.Management.Automation.RuntimeDefinedParameterDictionary
        # Generate and set the ValidateSet 
        $arrSet = (Get-VDPortgroup | ?{$_.name -like "*VLAN*"}).name
        $ValidateSetAttribute = New-Object System.Management.Automation.ValidateSetAttribute($arrSet)    
        # Add the ValidateSet to the attributes collection
        $AttributeCollection.Add($ValidateSetAttribute)
        # Create and return the dynamic parameter
        $RuntimeParameter = New-Object System.Management.Automation.RuntimeDefinedParameter($ParamName_portgroup, [string], $AttributeCollection)
        $RuntimeParameterDictionary.Add($ParamName_portgroup, $RuntimeParameter)

        
        # Set the dynamic parameters' name
        $ParamName_datastore = 'Datastore'
        # Create the collection of attributes
        $AttributeCollection = New-Object System.Collections.ObjectModel.Collection[System.Attribute]
        # Create and set the parameters' attributes
        $ParameterAttribute = New-Object System.Management.Automation.ParameterAttribute
        $ParameterAttribute.Mandatory = $true
        $ParameterAttribute.Position = 2
        # Add the attributes to the attributes collection
        $AttributeCollection.Add($ParameterAttribute)  
        # Generate and set the ValidateSet 
        $arrSet = (Get-Datastore).name
        $ValidateSetAttribute = New-Object System.Management.Automation.ValidateSetAttribute($arrSet)
        # Add the ValidateSet to the attributes collection
        $AttributeCollection.Add($ValidateSetAttribute)
        # Create and return the dynamic parameter
        $RuntimeParameter = New-Object System.Management.Automation.RuntimeDefinedParameter($ParamName_datastore, [string], $AttributeCollection)
        $RuntimeParameterDictionary.Add($ParamName_datastore, $RuntimeParameter)
        return $RuntimeParameterDictionary


    }

    begin{}
    process {
        $portgroup = $PsBoundParameters[$ParamName_portgroup]
        $datastore = $PsBoundParameters[$ParamName_datastore]   
    }
    end {}
}

This worked great, I tried Register-ArgumentCompleter, ArgumentCompleter but those seems working only on ISE.

This was the golden ticket for my custom VM deployment function! I no longer have to maintain a static list inside the parameter's validateset for hundreds of VM templates, networks, portgroups, etc.

Setting the ParameterAttribute.Postition = 0 on all the dynamic params allows intelisense to work (not setting will break intelisense).

There is also considerable lag when pulling info from vCenter (we have a big environment) so I made a scheduled task to keep the info in simple txt files that the function can quickly read from. I may switch that over to a SQL DB later.