WebSharper 4.1 (Dec 24, 2017)

• A unified, declarative framework for server-side (sitelets) and client-side (SPA) routing This will enable using the same syntax for client- and server-side routers+controllers.

  C#:

  Router:

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  [JavaScript, EndPoint("/")]
  public class Root
  {
      [EndPoint("/about")]
      public class About : Root
      {
          [EndPoint("/book/{Id}")]
          public class Book : About
          {
              public string Id;
          }
      }
  }

  Controller:

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  public class SiteletTest
  {
      public static Sitelet<Root> MySite =
          var router = Router.Infer<Root>;
          router.MakeSitelet((ctx, endpoint) =>
          {
              switch (endpoint)
              {
                  case Root.About.Book b:
                      return Content.Page(div($"About page for Book #{b.Id}"));
                  case Root h:
                      return Content.Page(
                          div(
                              h1("This is the home page"),
                              a("About book #1", attr.href(router.Link(new Root.About.Book() { Id = 1 })))
                          )
                      );
                  default:
                      return Content.NotFound();
              }
          });
  }

• Enhancements to reactive templating - encapsulated data models, client-side event handlers in sitelets