Live editing with Semantic UI and dotnet watch

In my previous post I got started using .NET Core Razor pages with Semantic UI. After writing the post I was convinced I'd be using Semantic UI for my next blog redesign. One reason is that when you use Semantic UI's gulp build tools alongside .NET's watch tool, you can be really efficient in designing your site and figuring out how you want it to look. This post demonstrates how to use Visual Studio Code and the built-in multiple-tab terminal window to make this a natural development experience.

Copying the default theme into a new folder named brady makes it easy for me to feel comfortable customizing numerous colors and font sizes, and anything else I want to tweak without fearing I've boned up the default theme. Once I get that working I can run dotnet watch run to start up my site.

dotnet watch

I got started with one of the built-in Semantic UI layouts, with a simple menu at the top of my site.

The before UI

Semantic UI offers a handy gulp watch command that, when executed, will watch all of the files in my theme (or any of the Semantic UI override files). Whenever I change any of these files the changes will be picked up and the CSS/JS files will be rebuilt. I don't want to stop the ASP.NET server from running, but I do want to see immediate updates when I make changes to my Semantic UI theme files. So I open up a new tab in Visual Studio Code and cd into the semantic folder in my project root (not the semantic folder inside of wwwroot!).

Adding a terminal tab

Now I can run the gulp watch build step and any change I make will be automatically picked up. So, let's make a quick change to the top menu bar to give the site some color.

Gulp watch

I'll open up the original default menu theme file that I copied into my own brady theme.

Original menu

Now, I'll change the @background variable to be a blue that might look better with my photo. As soon as I save the file the files are rebuit.

Edited menu

Once the build completes I can refresh the browser, and the changes are visible.

Resulting menu


This post continues my exploration into how Semantic UI and ASP.NET can be great together. I'm in the process of re-writing my blog tool to use Semantic UI, so stay tuned as in the next few days I'll release a new-and-improved site and much simpler codebase for the downr blogging system. Happy coding!

Brady Gaster
Hi! I'm a christian dad who lives near Seattle, where I work with the talented folks at Microsoft to create compelling demonstrations for conferences that instruct and inspire developers who want to party in the cloud.