public class ChatClient
{
public string token { get; set; }
public string rnd { get; set; }
public WebSocket socket { get; set; }
}

public class SaasWebChat
{
    static ILogger _log;

    private static List<ChatClient> CONNECT_POOL = new List<ChatClient>();//用户连接池
    public async static Task ProcessChat(AspNetWebSocketContext context)
    {
        _log = IocManager.Instance.Resolve<ILogger>();
        WebSocket socket = context.WebSocket;
        string token = context.QueryString["token"].ToString();
        string rnd = context.QueryString["rnd"].ToString();

        try
        {
            #region 用户添加连接池
            //第一次open时，添加到连接池中
            var row = CONNECT_POOL.FirstOrDefault(t => t.token == token && t.rnd == rnd);
            if (row == null)
            {
                CONNECT_POOL.Add(new ChatClient
                {
                    socket = socket,
                    token = token,
                    rnd = rnd
                });//不存在，添加
                _log.Debug(rnd + "连接成功");
            }
            #endregion

            string descUser = string.Empty;//目的用户
            while (true)
            {
                if (socket.State == WebSocketState.Open)
                {
                    ArraySegment<byte> buffer = new ArraySegment<byte>(new byte[2048]);
                    WebSocketReceiveResult result = await socket.ReceiveAsync(buffer, CancellationToken.None);

                    #region 消息处理（字符截取、消息转发）
                    try
                    {
                        #region 关闭Socket处理，删除连接池
                        if (socket.State != WebSocketState.Open)//连接关闭
                        {
                            var client = CONNECT_POOL.FirstOrDefault(t => t.token == token && t.rnd == rnd);
                            if (client != null) CONNECT_POOL.Remove(client);//删除连接池
                            _log.Debug(client.rnd + "断开连接");
                            break;
                        }
                        #endregion

                        string userMsg = Encoding.UTF8.GetString(buffer.Array, 0, result.Count);//发送过来的消息
                        string[] msgList = userMsg.Split('|');
                        if (msgList.Length == 2)
                        {
                            if (msgList[0].Trim().Length > 0)
                                descUser = msgList[0].Trim();//记录消息目的用户
                            buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(msgList[1]));

                            var clientOnline = CONNECT_POOL.Where(t => t.token == descUser);
                            foreach (var item in clientOnline)
                            {
                                if (clientOnline != null)//判断客户端是否在线
                                {
                                    WebSocket destSocket = item.socket;//目的客户端
                                    if (destSocket != null && destSocket.State == WebSocketState.Open)
                                    {
                                        await destSocket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
                                        _log.Debug(item.rnd + "发送消息");
                                    }

                                }
                            }


                        }
                        else
                        {
                            buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(userMsg));
                            foreach (var item in CONNECT_POOL)
                            {
                                await item.socket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
                                _log.Debug(item.rnd + "发送消息");
                            }

                        }

                    }
                    catch (Exception exs)
                    {
                        //消息转发异常处理，本次消息忽略 继续监听接下来的消息
                        _log.Debug(rnd + "断开连接", exs);
                    }
                    #endregion
                }
                else
                {
                    break;
                }
            }//while end
        }
        catch (Exception ex)
        {
            var clientEx = CONNECT_POOL.FirstOrDefault(t => t.token == token && t.rnd == rnd);
            //整体异常处理
            if (clientEx != null)
            {
                CONNECT_POOL.Remove(clientEx);
                _log.Debug(clientEx.rnd + "断开连接", ex);

            }
        }
    }

    public static void SendMessage(string token, string data)
    {
        _log = IocManager.Instance.Resolve<ILogger>();

        ArraySegment<byte> buffer = new ArraySegment<byte>(new byte[2048]);
        buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(data));

        var clientOnline = CONNECT_POOL.Where(t => t.token == token);//目的客户端
        foreach (var item in clientOnline)
        {
            try
            {

                if (item.socket != null && item.socket.State == WebSocketState.Open)
                {
                    item.socket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
                    _log.Debug(item.rnd + "发送消息");
                }
            }
            catch (Exception ex)
            {
                CONNECT_POOL.Remove(item);
                _log.Debug(item.rnd + "断开连接",ex);
            }
        }

    }
}