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Socket.IO .NET

Socket.IO enables real-time bidirectional event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

  • Real-time analytics
    Push data to clients that gets represented as real-time counters, charts or logs.
  • Instant messaging and chat
    Socket.IO's "Hello world" is a chat app in just a few lines of code.
  • Binary streaming
    Starting in 1.0, it's possible to send any blob back and forth: image, audio, video.
  • Document collaboration
    Allow users to concurrently edit a document and see each other's changes.

USED BY EVERYONE
From Microsoft Office, Yammer, Zendesk, Trello... to hackathon winners and little startups.

IMMENSELY POWERFUL, YET EASY TO USE
Our getting started guide will show you how to create lots of amazing applications in fewer than 200 lines of code.

Connect to Server

Connecting to a Socket.IO server is just two lines:

// connect to a Socket.IO server
socket = IO.Socket("http://chat.socket.io/");
socket.Connect();

// disconnect from the server
socket.Close();

Subscribe to Events

Listening for messages from the server is easy,all we need to do is attach a delegate to the event name using the On method.

The data received from the http://chat.socket.io/ server is a JToken value:

// whenever the server emits "login", print the login message
socket.On("login", data => {
    connected = true;
    
    // get the json data from the server message
    var jobject = data as JToken;
    
    // get the number of users
    var numUsers = jobject.Value<int>("numUsers");
    
    // display the welcome message...
});

// whenever the server emits "new message", update the chat body
socket.On("new message", data => {
    // get the json data from the server message
    var jobject = data as JToken;
    
    // get the message data values
    var username = jobject.Value<string>("username");
    var message = jobject.Value<string>("message");
    
    // display message...
});

Send a Message

Sending a message to the server is just a single line of code that makes use of the Emit method:

// we can send messages to the server
socket.Emit("add user", "username");
if (connected) {
   socket.Emit("new message", "This is a message from Xamarin.Android...");
}

// or we can just send events
socket.Emit("typing");
// cancel that typing event
socket.Emit("stop typing");