I am trying to figure out a way to update my web.config for different environments by updating the configSource for the appSettings element in the web.config.

Here are the way I know how to do it.

$xml.get_DocumentElement().appSettings.configSource = $replaced_test

The problem is that I want one base script where I can pass in different nodes to the script that I want to change and update but I am not sure how to do it.

For example, I want to be able to call a powershell script like this

changeWebConfig.ps1 nodeToChange newValueofNode

I hope this was clear enough.

This is the code I have now.

$webConfigPath = "C:\web.config"   

# Get the content of the config file and cast it to XML 
$xml = [xml](get-content $webConfigPath) 

#this was the trick I had been looking for  
$root = $xml.get_DocumentElement()."system.serviceModel".client.configSource  = $replace

# Save it  
$xml.Save($webConfigPath)