webfrom B/S 消息推送

转哪的忘了，这个适用于不支持html5浏览器,只是写了个大概，至于BUG和需求啥地，需要自己慢慢鼓捣了。

myAsynResult.cs:

/// <summary>
    /// 请求的客户端
    /// </summary>
    public class myAsynResult : IAsyncResult
    {
        #region IAsyncResult接口      
        public object AsyncState
        {
            get
            {
                //throw new NotImplementedException();
                return null;
            }
        }
        public WaitHandle AsyncWaitHandle
        {
            get
            {
                //throw new NotImplementedException();
                return null;
            }
        }
        public bool CompletedSynchronously
        {
            get
            {
                //throw new NotImplementedException();
                return false;
            }
        }
        public bool IsCompleted
        {
            get
            {
                //throw new NotImplementedException();
                return false;
            }
        }
        #endregion

        bool _IsCompleted = false;
        private HttpContext context;
        private AsyncCallback cb;
        private object extraData;
        public myAsynResult(HttpContext context, AsyncCallback cb, object extraData)
        {
            this.context = context;
            this.cb = cb;
            this.extraData = extraData;
        }

        public string content { get; set; }
        public void Send(object data)
        {
            context.Response.Write(this.content);
            if (cb != null)
            {
                cb(this);
            }
            _IsCompleted = true;
        }
    }

Model_Requery.cs:

/// <summary>
    /// 请求
    /// </summary>
    public class Model_Requery
    {
        public RequeryType type { get; set; }
        /// <summary>
        /// 内容
        /// </summary>
        public string content { get; set; }

    }

    public enum RequeryType
    {
        登录 = 0,
        个人 = 1,
        全部 = 2
    }

Messages.cs:

/// <summary>
    /// 消息
    /// </summary>
    public class Messages
    {
        List<myAsynResult> clients = new List<myAsynResult>();
        private static readonly Messages _Instnce = new Messages();
        private Messages() { }
        public static Messages Instance()
        {
            return _Instnce;
        }
        /// <summary>
        /// 消息信息处理
        /// </summary>
        /// <param name="m"></param>
        /// <param name="asyncResult"></param>
        public void AddMessage(Model_Requery m, myAsynResult asyncResult)
        {
            //当传入的内容为"-1"时,表示为建立连接请求,即为了维持一个从客户端到服务器的连接而建立的连接
            //此时将该连接保存到List<myAsynResult> clients中,待再有消息发送过来时,该连接将不会被遍历,并且会将该连接输出内容后，结束该连接
            switch (m.type)
            {
                case RequeryType.登录:
                    clients.Add(asyncResult);
                    break;
                case RequeryType.个人:
                    break;
                case RequeryType.全部:
                    //将当前请求的内容输出到客户端
                    asyncResult.content = m.content;
                    asyncResult.Send(null);

                    foreach (myAsynResult result in clients)
                    {
                        result.content = m.content;
                        result.Send(null);
                    }

                    //清空所有缓存
                    clients.Clear();
                    break;
            }
        }
    }

MessagePushController.ashx:

/// <summary>
    /// MessagePushController 的摘要说明
    /// </summary>
    public class MessagePushController : IHttpAsyncHandler
    {

        public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
        {
            //myAsynResult为实现了IAsyncResult接口的类，当不调用cb的回调函数时，该请求不会返回到给客户端，会一直处于连接状态
            myAsynResult asyncResult = new myAsynResult(context, cb, extraData);
            int type = 0;
            int.TryParse(context.Request["type"], out type);
            RequeryType requerytype;
            switch (type)
            {
                case 1: requerytype = RequeryType.个人; break;
                case 2: requerytype = RequeryType.全部; break;
                default: requerytype = RequeryType.登录; break;
            }
            string content = context.Request["contents"];
            Model_Requery model = new Model_Requery()
            {
                type = requerytype,
                content = content
            };
            Messages.Instance().AddMessage(model, asyncResult);
            return asyncResult;
        }

        public void EndProcessRequest(IAsyncResult result)
        {
            //throw new NotImplementedException();
        }

        public void ProcessRequest(HttpContext context)
        {

        }



        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }

Demo.aspx

<!DOCTYPE html>

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <script src="/scripts/jquery-1.7.2.min.js" type="text/javascript"></script>
    <title></title>
    <script type="text/javascript">
        $(function () {
            $('#send').click(function () {
                $.ajax({
                    url: "MessagePushController.ashx",
                    type: 'post',
                    data: {
                        type: 2,
                        contents: $('#txt_client').val()
                    }
                });
            });
            ConnectServer();
            function ConnectServer() {
                /// <summary>
                /// 与服务器建立连接
                /// </summary>
                $.ajax({
                    url: 'MessagePushController.ashx',
                    data: { type: 0, contents: "0" },
                    type: 'post',
                    success: function (data, status) {
                        $('#txt_server').val(data);
                        ConnectServer();
                    }
                });
            }
        });
    </script>
</head>
<body>
    <div>
        <span>服务器</span>
        <div>
            <textarea id="txt_server"></textarea>
        </div>
    </div>
    <div>
        <span>发送信息</span>
        <div>
            <input type="text" id="txt_client"></input>
        </div>
        <div>
            <input type="button" id="send" value="发送" />
        </div>
    </div>
</body>
</html>