How to install and import module before call DSC in the same script?

Question

I am trying to create a script which will prepare my web server. VM is Windows Server 2016 clean installation without any adjustments and imported modules and configurations. Inside the script, I have a mix of functions and DSC configuration for installing .NET, create directories, join to the domain. At the beginning of the script, I call:

Install-PackageProvider -Name Nuget... Install-Module xWebAdmin... Import-Module ...

Then some functions, and DSC configurations. When I run a script, first go to DSC configuration and displaying error from the image below.

I do not know how and where in my script, first to install all necessary packages and modules and then execute rest of the script and configuration.

As I do not have installed and imported modules xWindowsUpdate, xWebAdministration, this won't execute, even if I put import-module at the beginning of the script.

Install-Module -Name xWebAdministration -Force
Install-Module -Name xWindowsUpdate -Force 

Configuration IIS
{  
Import-DscResource –ModuleName PSDesiredStateConfiguration, xWindowsUpdate, 
xWebAdministration

Node "localhost"
{  
    {
        Ensure = "Present" 
        Type = "Directory" 
        DestinationPath = "C:\DSCDeployment"    
    }

Any hint and advice?

Answer 1

It seems that it's not possible to do install module and call DSC config in the same file. First, PowerShell will parse the Configuration and will try to resolve the Import-DSCResource keywords (and fail because they're not available). It has to be done in 2 separate files...