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The use of fluent API's and declartive syntax is gaining popularity. There is a lot to be said for this as it becomes very clear about what we might expect.

Using the Fluent API

          .WithParameter("message", "Hello World")
          .Catch(e =>
              // Equivalent to catch(Exception e)
          .Catch<ArgumentNullException>(e =>
              // Equivalent to catch(ArgumentNullException e)


When using the Fluent API, ExecuteAsync returns a Task<bool> and not a Task<INavigationResult>. It is important that if you want to do something with an exception returned by the INavigationResult in the underlying API, you must provide a Catch to handle it in the Fluent API.