SignalR是一种可用来简化交互式实时多用户Web应用程序开发的框架,该框架充分应用了异步技术带来的优势,可用来实现性能最好的即时性应用。
1.创建MVC5项目
2.添加SignalR包
3.创建ChatHub类
using Microsoft.AspNet.SignalR; using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using System.Web; namespace SignalRChat.Hubs { public class ChatHub : Hub { //public async Task SendMessage(string user, string message) //{ // await Clients.All.SendAsync("ReceiveMessage", user, message); //} public void Send(string name, string message) { // Call the addNewMessageToPage method to update clients. Clients.All.addNewMessageToPage(name, message); } } }
4.修改Startup类
using Microsoft.Owin; using Owin; [assembly: OwinStartupAttribute(typeof(SignalRChat.Startup))] namespace SignalRChat { public partial class Startup { public void Configuration(IAppBuilder app) { // Any connection or hub wire up and configuration should go here app.MapSignalR(); ConfigureAuth(app); } } }
5.创建相应的action以及视图
public ActionResult Chat() { return View(); }
视图代码:
@{ ViewBag.Title = "Chat"; } <h2>Chat</h2> <div class="container"> <input type="text" id="message" /> <input type="button" id="sendmessage" value="Send" /> <input type="hidden" id="displayname" /> <ul id="discussion"></ul> </div> @section scripts { <!--Script references. --> <!--The jQuery library is required and is referenced by default in _Layout.cshtml. --> <!--Reference the SignalR library. --> <!--<script src="~/Scripts/jquery.signalR-2.1.0.min.js"></script>--> <script src="~/Scripts/jquery.signalR-2.4.1.min.js"></script> <!--Reference the autogenerated SignalR hub script. --> <script src="~/signalr/hubs"></script> <!--SignalR script to update the chat page and send messages.--> <script> $(function () { // Reference the auto-generated proxy for the hub. var chat = $.connection.chatHub; // Create a function that the hub can call back to display messages. chat.client.addNewMessageToPage = function (name, message) { // Add the message to the page. $('#discussion').append('<li><strong>' + htmlEncode(name) + '</strong>: ' + htmlEncode(message) + '</li>'); }; // Get the user name and store it to prepend to messages. $('#displayname').val(prompt('Enter your name:', '')); // Set initial focus to message input box. $('#message').focus(); // Start the connection. $.connection.hub.start().done(function () { $('#sendmessage').click(function () { // Call the Send method on the hub. chat.server.send($('#displayname').val(), $('#message').val()); // Clear text box and reset focus for next comment. $('#message').val('').focus(); }); }); }); // This optional function html-encodes messages for display in the page. function htmlEncode(value) { var encodedValue = $('<div />').text(value).html(); return encodedValue; } </script> }
6.运行结果