用SignalR 2.0开发客服系统[系列2:实现聊天室]

//作用:将连接ID加入某个组
//Context.ConnectionId 连接ID,每个页面连接集线器即会产生唯一ID
//roomName分组的名称
Groups.Add(Context.ConnectionId, roomName);

//作用:将连接ID从某个分组移除
Groups.Remove(Context.ConnectionId, roomName);

//作用:调用分组内连接对象注册的本地JS
//XXX:本地JS名称
//Room:分组名称
// new string[0]:过滤(不发送)的连接ID数组
 Clients.Group(Room, new string[0]).XXXX

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
using System.ComponentModel.DataAnnotations;
using Microsoft.AspNet.SignalR;

namespace SignalRTest
{
    public class UserContext 
    {
        public UserContext()
        {
            Users = new List<User>();
            Connections = new List<Connection>();
            Rooms = new List<ConversationRoom>();
        }
        //用户集合
        public List<User> Users { get; set; }
        //连接集合
        public List<Connection> Connections { get; set; }
        //房间集合
        public List<ConversationRoom> Rooms { get; set; }
    }

    public class User
    {
        [Key]
        //用户名
        public string UserName { get; set; }
        //用户的连接
        public List<Connection> Connections { get; set; }
        //用户房间集合
        public virtual List<ConversationRoom> Rooms { get; set; }

        public User()
        {
            Connections = new List<Connection>();
            Rooms = new List<ConversationRoom>();
        }
    }

    public class Connection
    {
        //连接ID
        public string ConnectionID { get; set; }

        //用户代理
        public string UserAgent { get; set; }
        //是否连接
        public bool Connected { get; set; }
    }

    /// <summary>
    /// 房间类
    /// </summary>
    public class ConversationRoom
    {
        //房间名称
        [Key]
        public string RoomName { get; set; }
        //用户集合
        public virtual List<User> Users { get; set; }


        public ConversationRoom()
        {
            Users = new List<User>();
        }
    }

}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.AspNet.SignalR;
using System.Threading.Tasks;
using Microsoft.AspNet.SignalR.Hubs;
using Newtonsoft.Json;

namespace SignalRTest
{
    [HubName("groupsHub")]
    public class GroupsHub : Hub
    {
        public static UserContext db = new UserContext();
        public void Hello()
        {
            Clients.All.hello();
        }
        /// <summary>
        /// 重写Hub连接事件
        /// </summary>
        /// <returns></returns>
        public override Task OnConnected()
        {

                // 查询用户。
                var user = db.Users.SingleOrDefault(u => u.UserName == Context.ConnectionId);

                //判断用户是否存在,否则添加
                if (user == null)
                {
                    user = new User()
                    {
                        UserName = Context.ConnectionId
                    };
                    db.Users.Add(user);
                   
                }
               //发送房间列表
                var itme = from a in db.Rooms
                           select new { a.RoomName };
                Clients.Client(this.Context.ConnectionId).getRoomlist(JsonConvert.SerializeObject(itme.ToList()));
            return base.OnConnected();
        }

        /// <summary>
        /// 更新所有用户的房间列表
        /// </summary>
        private void GetRoomList()
        {
           

            var itme = from a in db.Rooms
                       select new { a.RoomName };
            string jsondata = JsonConvert.SerializeObject(itme.ToList());
            Clients.All.getRoomlist(jsondata);
            
        }
        /// <summary>
        /// 重写Hub连接断开的事件
        /// </summary>
        /// <returns></returns>
        public override Task OnDisconnected()
        {
             var user = db.Users.Where(u => u.UserName == Context.ConnectionId).FirstOrDefault();
            
                //判断用户是否存在,存在则删除
                if (user != null)
                {
                    //删除用户
                    db.Users.Remove(user);
                    // 循环用户的房间,删除用户
                    foreach (var item in user.Rooms)
                    {
                        RemoveFromRoom(item.RoomName);
                        
                    }
                }


            return base.OnDisconnected();
        }

        /// <summary>
        /// 加入聊天室
        /// </summary>
        /// <param name="roomName"></param>
        public void AddToRoom(string roomName)
        {
                //查询聊天室
                var room = db.Rooms.Find(a=>a.RoomName==roomName);
               //存在则加入
                if (room != null)
                {
                    //查找房间中是否存在此用户
                    var isuser = room.Users.Where(a => a.UserName == Context.ConnectionId).FirstOrDefault();
                    //不存在则加入
                    if (isuser == null)
                    {
                        var user = db.Users.Find(a => a.UserName == Context.ConnectionId);
                        user.Rooms.Add(room);
                        room.Users.Add(user);
                        Groups.Add(Context.ConnectionId, roomName);
                        //调用此连接用户的本地JS(显示房间)
                        Clients.Client(Context.ConnectionId).addRoom(roomName);
                    }
                    else
                    {
                        Clients.Client(Context.ConnectionId).showMessage("请勿重复加入房间!");
                    }
                }
               
            
        }

        /// <summary>
        /// 创建聊天室
        /// </summary>
        /// <param name="roomName"></param>
        public void CreatRoom(string roomName)
        {
            var room = db.Rooms.Find(a => a.RoomName == roomName);
            if (room == null)
            {
                ConversationRoom cr = new ConversationRoom()
                {
                    RoomName = roomName
                };
                //将房间加入列表
                db.Rooms.Add(cr);
                AddToRoom(roomName);
                Clients.Client(Context.ConnectionId).showMessage("房间创建完成!");
                GetRoomList();
            }
            else
            {
                Clients.Client(Context.ConnectionId).showMessage("房间名重复!");
            }

        }

        /// <summary>
        /// 退出聊天室
        /// </summary>
        /// <param name="roomName"></param>
        public void RemoveFromRoom(string roomName)
        {

                //查找房间是否存在
            var room = db.Rooms.Find(a => a.RoomName == roomName);
              //存在则进入删除
                if (room != null)
                {
                    //查找要删除的用户
                    var user = room.Users.Where(a => a.UserName == Context.ConnectionId).FirstOrDefault();
                    //移除此用户
                    room.Users.Remove(user);
                    //如果房间人数为0,则删除房间
                    if (room.Users.Count <= 0)
                    {
                        db.Rooms.Remove(room);

                    }
                    Groups.Remove(Context.ConnectionId, roomName);
                    //提示客户端
                    Clients.Client(Context.ConnectionId).removeRoom("退出成功!");
                }
         
            
        }
        /// <summary>
        /// 给分组内所有的用户发送消息
        /// </summary>
        /// <param name="Room">分组名</param>
        /// <param name="Message">信息</param>
        public void SendMessage(string Room, string Message)
        {
            Clients.Group(Room, new string[0]).sendMessage(Room,Message+" "+DateTime.Now.ToString());
        }
       


    }
}

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <script src="Scripts/jquery-1.10.2.min.js"></script>
    <script src="Scripts/jquery.signalR-2.0.0.min.js"></script>
    <!--这里要注意,这是虚拟目录,也就是你在OWIN Startup中注册的地址-->
    <script src="signalr/hubs"></script>

    <script>
        var chat
        var roomcount = 0;
        $(function () {
                chat = $.connection.groupsHub;
                chat.client.showMessage = function (Message) {

                    alert(Message);
                }
                chat.client.sendMessage = function (roomname, message) {
                    $("#" + roomname).find("ul").each(function () {
                        $(this).append('<li>'+message+'</li>')
                    })
                }
                chat.client.removeRoom = function (data) {
                    alert(data);
                }
                chat.client.addRoom = function (roomname) {
                    var html = '<div style="float:left; margin-left:30px; border:double" id="' + roomname + '" roomname="' + roomname + '"><button onclick="RemoveRoom(this)">退出</button>\
                                    ' + roomname + '房间\
                                                聊天记录如下:<ul>\
                                                </ul>\
                                    <input type="text" /> <button onclick="SendMessage(this)">发送</button>\
                                    </div>'
                    $("#RoomList").append(html);
                }
                //注册查询房间列表的方法
                chat.client.getRoomlist = function (data) {
                    if (data) {
                        var jsondata = $.parseJSON(data);
                        $("#roomlist").html(" ");
                        for (var i = 0; i < jsondata.length; i++) {
                            var html = ' <li>房间名:' + jsondata[i].RoomName + '<button roomname="'+jsondata[i].RoomName+'" onclick="AddRoom(this)">加入</button></li>';
                            $("#roomlist").append(html);
                        }
                    }
                }
                // 获取用户名称。
                $('#username').html(prompt('请输入您的名称:', ''));

                $.connection.hub.start().done(function () {
                    $('#CreatRoom').click(function () {
                        if (roomcount < 2) {
                            chat.server.creatRoom($("#Roomname").val());
                            roomcount++;
                        } else {
                            alert("聊天窗口只允许有2个")
                        }
                    })
                });

        });
        function SendMessage(btn) {
            var message = $(btn).prev().val();
            var room = $(btn).parent();
            var username = $("#username").html();
            message = username + ":" + message;
            var roomname = $(room).attr("roomname");
            chat.server.sendMessage(roomname,message);

        }
        function RemoveRoom(btn) {
            var room = $(btn).parent();
            var roomname = $(room).attr("roomname");
            chat.server.removeFromRoom(roomname);
        }
        function AddRoom(roomname) {
             var data =$(roomname).attr("roomname");
             chat.server.addToRoom(data);
        }

    </script>

</head>
<body>
    <div>
        <div>名称:<p id="username"></p></div>
        输入房间名:
        <input type="text" value="asdasd" id="Roomname" />
        <button id="CreatRoom">创建聊天室</button>
    </div>
    <div style="float:left;border:double">
        <div>房间列表</div>
        <ul id="roomlist">
        </ul>
    </div>
    <div id="RoomList">
    </div>
</body>
</html>