结合 WebService 实现消息 主动推送到客户端

说明：不需要复杂的技术，不需要长轮循，还是老技术实现，上代码

1.消息实体

    public class NoticeModel {
        public string Sender { get; set; }
        public string Reciever { get; set; }
        public string Content { get; set; }
        public DateTime SendDateTime { get; set; }
    } 
 
2. 消息队列
 
    public class NoticeQueen {
        private ManualResetEvent resetEvent = new ManualResetEvent(false);
        private Queue queue = new Queue();
 
        public void EnQueen(NoticeModel noticeModel) {
            lock (queue) {
                queue.Enqueue(noticeModel);
                resetEvent.Set();
            }
        }
 
        public NoticeModel DeQueen() {
            resetEvent.WaitOne();
            lock (queue) {
                if (this.queue.Count == 1) {
                    this.resetEvent.Reset();
                }
                return queue.Dequeue();
            }
        }
    } 

3.消息适配
 
   public class NoticeAdapter {
 
        public Dictionary noticeQueens = new Dictionary();
 
        public static NoticeAdapter NoticeAdapterInstance = new NoticeAdapter();
 
        public string AddClient(string clientName) {
            try {
                if (!this.noticeQueens.ContainsKey(clientName)) {
                    this.noticeQueens[clientName] = new NoticeQueen();
                }
                return clientName;
            }
            catch (Exception) {
                return null;
            }
        }
        public void AddNotice(NoticeModel noticeModel) {
            if (noticeQueens.ContainsKey(noticeModel.Reciever)) {
                NoticeAdapterInstance.noticeQueens[noticeModel.Reciever].EnQueen(noticeModel);
            }
        }
 
        public NoticeModel GetNotice(NoticeModel noticeModel) {
            if (noticeQueens.ContainsKey(noticeModel.Reciever)) {
                return NoticeAdapterInstance.noticeQueens[noticeModel.Reciever].DeQueen();
            }
            return new NoticeModel();
        }
 
    }
 
4.消息接收页
 
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="NoticeReciever.aspx.cs" Inherits="WebApplication.SiteNotice.NoticeReciever" %>
 

 



    
    
    
    
    


    

        
            
                
            
        
    

    
    
    


 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
namespace WebApplication.SiteNotice {
    public partial class NoticeReciever : System.Web.UI.Page {
        public string UserID { get; set; }
        protected void Page_Load(object sender, EventArgs e) {
            if (!IsPostBack) {
                UserID = Session.SessionID;
                NoticeAdapter.NoticeAdapterInstance.AddClient(Session.SessionID);
            }
        }
 
 
    }
}  
 
5.消息发送页
 
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="NoticeSender.aspx.cs" Inherits="WebApplication.SiteNotice.NoticeSender" %>
 

 



    


    

    

        
        
    
    


 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
namespace WebApplication.SiteNotice {
    public partial class NoticeSender : System.Web.UI.Page {
        protected void Page_Load(object sender, EventArgs e) {
 
        }
 
        protected void btn_sender_Click(object sender, EventArgs e) {
            var clients = NoticeAdapter.NoticeAdapterInstance.noticeQueens;
            foreach (var noticeQueen in clients) {
                NoticeAdapter.NoticeAdapterInstance.AddNotice(new NoticeModel() {
                    Reciever = noticeQueen.Key,
                    Content = txt_Content.Text
                });
 
            }
        }
    }
} 
 
6.webservice 调用
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
 
namespace WebApplication.SiteNotice {
    /// 

    /// SiteNoticeServ 的摘要说明
    /// 
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消注释以下行。 
    [System.Web.Script.Services.ScriptService]
    public class SiteNoticeServ : System.Web.Services.WebService {
 
        [WebMethod]
        public string HelloWorld() {
            return "Hello World";
        }
        [WebMethod]
        public NoticeModel WaiteNotice(string reciever) {
            var model = NoticeAdapter.NoticeAdapterInstance.GetNotice(new NoticeModel() { Reciever = reciever });
            return model;
        }
 
 
    }
} 

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