How to execute Wix custom action after installation?

Question

I am using Wix3 to install WCF service to IIS.

How can I use my custom action (c#) function after installation completed? i.e. I need to open installed web.config file a

Answer 1

Why would you:

1) Need a custom action? 2) Do it after the install instead of during the install?

WiX has a built-in extension for handling what you are trying to do:

XmlFile Element (Util Extension)

It will update your XML after the file has been installed and handle rollback scenarios as well.

What you will have to write a CA for though is reading the XML value back into a property ti handle repair and upgrade situations. Read:

The WiX toolset's "Remember Property" pattern.