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Adding a custom favicon

Nathan Armstrong edited this page Apr 6, 2017 · 19 revisions

By default, Nancy will use an icon of the Nancy logo as the favicon for any Nancy application, unless you provide you own. Overriding this behavior to provide your own custom icon is very simple

Replacing the default FavIcon

Simply place a .ico or .png file, called favicon anywhere in your application path (to learn more about the application root path, please consult the The Root Path section) and Nancy will recursively scan your application, at start up, for the file.

If you have more than one favicon in your application, the first one it finds will be used.

Using an embedded icon

You can also embed a favicon in your application assembly. To make Nancy use the embedded icon, simply override the FavIcon property of your bootstrapper, and add the following code:

public class Bootstrapper : DefaultNancyBootstrapper
    private byte[] favicon;

    protected override byte[] FavIcon
        get { return this.favicon?? (this.favicon = LoadFavIcon()); }

   private byte[] LoadFavIcon()
      //TODO: remember to replace 'AssemblyName' with the prefix of the resource
      using (var resourceStream = GetType().Assembly.GetManifestResourceStream("AssemblyName.favicon.ico"))
         var memoryStream = new MemoryStream();
         return memoryStream.GetBuffer();

Alternatively, place the favicon file into the assembly's Resources.resx. Then use the generated wrapper code like so:

protected override byte[] FavIcon => YourAssemblyNamespace.Properties.Resources.FavIcon

Removing the icon

If you do not wish to use a favicon at all, then simply override the FavIcon property on your Bootstrapper and return null.

Note that returning null will result in requests for /favicon.ico being passed along the pipeline, which means (in particular) that your modules may see this request.

Help! I can't see my icon


  1. Clearing your browser's cache.
  2. Navigating to http://site/favicon.ico and forcing a refresh (usually Ctrl+F5).

« Part 16. Diagnostics  —  Documentation overview  —  Part 18. Generating a custom error page »

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