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.

Hey Joey,

This code helped me a lot. I tried to solve the slow tab completion when enumerating information via Microsoft Graph, like getting the displayname for 3000+ users.

When the variables $TenantId, $ApplicationClientId and $CertificateThumbprint are set with the correct values, then the variable $FilterUserName will be available. I still search for a better solution. I saw that when the variable, like '$TabCompletionFunctionGetMgUsers=EnumerateWithPaging -Data ((Get-MgUser -All -Property DisplayName).DisplayName)' is set, that each time I use the tab completion it first executes the command (Get-MgUser -All...).
If hope you have a solution for this problem, like that DynamicParam only executes the variable once...this is for now the best that I could do...

[CmdLetBinding(DefaultParameterSetName="Default",
SupportsPaging
)]

Param (
[Parameter( ParameterSetName = "Default",Position = 0 , Mandatory )]$TenantId,
[Parameter( ParameterSetName = "Default",Position = 1 , Mandatory )]$ApplicationId,
[Parameter( ParameterSetName = "Default",Position = 2 , Mandatory )]$CertificateThumbprint
)

DynamicParam {

Function EnumerateWithPaging {
    Param (
      $Data 
    )
    Begin {
    }
    Process {
    }
    End{
      If ( $Data.count -Gt 0 ) {
        $First = $PSCmdlet.PagingParameters.Skip
        $Last = $First + 
        [Math]::Min( $PSCmdlet.PagingParameters.First, $Data.Count - $PSCmdlet.PagingParameters.Skip ) - 1    
        If( $Last -Le 0 ) { $Data = $Null } Else { $Data = $Data[$First..$last]
        Write-Output $Data
        }
      }
      If ( $PSCmdlet.PagingParameters.IncludeTotalCount ) {
        [double]$Accuracy = 1.0
        $PSCmdlet.PagingParameters.NewTotalCount( $Data.count , $Accuracy )
      }
    }
}

Function ConnectMgGraph {
  Try {
    Connect-MgGraph -TenantId $TenantId -ApplicationId $ApplicationClientId -CertificateThumbprint $CertificateThumbprint -ClientTimeout 120 -NoWelcome -ErrorAction Stop
  } Catch {
    EXIT
  }
}

ConnectMgGraph

  # TabCompletion GetMgUsers parameters
  $TabCompletionNameGetMgUsers='FilterUserName'
  $TabCompletionFunctionGetMgUsers=EnumerateWithPaging -Data ((Get-MgUser -All -Property DisplayName).DisplayName)
  $TabCompletionPositionGetMgusers=3
  $TabCompletionMandatoryGetMgusers=$False
  $TabCompletionTypeGetMgUsers=[String]
  $TabCompletionParameterSetNameGetMgusers='__AllParameterSets'

  # Add additional TabCompletion parameters block here... (copy from above, adjust)

  # Begin TabCompletion
  $RuntimeParameterDictionary=New-Object System.Management.Automation.RuntimeDefinedParameterDictionary

  # TabCompletion GetMgUsers add to dictionary
  $A=New-Object System.Collections.ObjectModel.Collection[System.Attribute]
  $P=New-Object System.Management.Automation.ParameterAttribute
  $P.Mandatory=$TabCompletionMandatoryGetMgUsers
  $P.ParameterSetName=$TabCompletionParameterSetNameGetMgusers
  $P.Position=$TabCompletionPositionGetMgUsers
  $A.Add($P)
  $V=New-Object System.Management.Automation.ValidateSetAttribute($TabCompletionFunctionGetMgUsers)
  $A.Add($V)
  $R=New-Object System.Management.Automation.RuntimeDefinedParameter($TabCompletionNameGetMgUsers,$TabCompletionTypeGetMgUsers,$A)
  $RuntimeParameterDictionary.Add($TabCompletionNameGetMgUsers,$R)

  # Add additional TabCompletion dictionary preparation here... (copy from above, adjust)

  # End TabCompletion
  Return $RuntimeParameterDictionary

}

Begin {}
Process{}
End{}