.NET Configuration Transformations

I’m playing around with XML transformations today and needed a refresher.  This is a pretty good explanation straight from the horse’s mouth.


I’m deploying to an Azure website, in which case there are ways to keep connection strings and app settings unique to each slot of your website.  https://azure.microsoft.com/en-us/blog/windows-azure-web-sites-how-application-strings-and-connection-strings-work/

However, the setting I need to tweak for production isn’t an “app setting”, but rather a servicemodel client endpoint, which apparently has to be done the hard way. 🙁


Note: When your transformation is working, you can see the output in VS after a build here: \obj\Release\TransformWebConfig\transformed

This post shows the syntax for adding a dependent configuration specific config file.


I hated the MS Xml configuration transformation mechanism so much that I wrote a simplified replacement, including a very optimized MS build task. I’ve never written this up on my blog, but the code and a brief description is here:


I’ve used it across several production projects with great success. It will be obsolete once the new ASP.NET 5 / Core .NET configuration mechanism becomes mainstream.

If you are interested in using it I will package up a sample project and a more comprehensive writeup.

Leave a Reply

%d bloggers like this: