When that method's invoked, it triggers a messageReceived method to be invoked on any client that's listening. In this case, I'll create a hub named Chat that exposes a method named Send to all of its clients. It's possible to get more granular and closer to the metal if you need a higher level of customization in your applications, but for most uses, hubs take care of a lot of the details and keep things nice and easy. In SignalR, a hub is a high-level API in the pipeline that provides an easy way to create a communication endpoint. In fact, most of those lines are just curly braces and ceremony, and there's only one line that actually requires a semicolon. Public void Send(string platform, string message)Ĭ(platform, message) Īs you can see, there really isn't much code in here at all. To do that, add a new class named Chat to the project: Next, all I need to do is create a simple chat endpoint for clients to connect to. To add SignalR to the project, simply add it through NuGet everything else is taken care of. In Visual Studio, create a new empty ASP.NET project. It's also worth noting that when working with the iOS and Android clients, the best transport mechanism is currently Server Sent Events.įor the server-side component, I'll use a simple ASP.NET Web site to host SignalR. Seeing how little code is needed to achieve something so powerful is what makes SignalR compelling. I know it's a little bit of a cliché to demonstrate a real-time application by showing a chat application, but bear with me on this one. To demonstrate, I'm going to build a simple application that shares its SignalR client code across iOS and Android. This means that you can write SignalR client code that's portable across many different platforms, which is very powerful. To make the deal even sweeter, all client libraries based on C# - all but the JavaScript client - share a lot of code and provide a common API. NET, JavaScript, Silverlight, Windows Phone, Windows RT and even iOS and Android through Xamarin. It's also important to remember that clients of SignalR applications aren't restricted to just Web browsers. If you're running SignalR on top of IIS, it's worth noting that to take advantage of WebSockets, you need to be running at least IIS 8. WebSockets is the most efficient mechanism, because it supports full two-way communication and is supported by most modern Web browsers SignalR, however, will degrade automatically to the best option supported by the client. The transport mechanisms currently supported by SignalR, in order of preference, are: Instead of dealing with that, you're provided with a simple API to develop against, letting you get started quickly and concentrate on the fun parts when building your applications. There are many different mechanisms under the hood for achieving this type of communication (depending on what the client supports), but SignalR abstracts all that away for you. This opens up a whole new world of possibilities for applications that simply weren't feasible in the past, and allows you to interact with your users on a whole new level. This means your servers and their clients can push data back and forth to each other in real time. For those who haven't, SignalR is a library that makes it extremely easy to add real-time communication to your applications. NET world by storm, so there's a good chance you've seen it in action by now, or at least heard something about it.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |