標籤：服務 query post 函數 模式 www als thread 建立
1.建立Comet_by_ASP.NET web項目2.handler類和result類namespace Handle{ /// <summary> /// Summary description for AsnyHandler /// </summary> public class AsnyHandler : IHttpAsyncHandler { public AsnyHandler() { } public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData) { //myAsynResult為實現了IAsyncResult介面的類，當不調用cb的回呼函數時，該請求不會返回到給用戶端，會一直處於串連狀態 myAsynResult asyncResult = new myAsynResult(context, cb, extraData); String content = context.Request.Params["content"]; //向Message類中添加該訊息 Messages.Instance().AddMessage(content, asyncResult); return asyncResult; } #region 不必理會 public void EndProcessRequest(IAsyncResult result) { } public bool IsReusable { get { return false; ; } } public void ProcessRequest(HttpContext context) { } #endregion } public class myAsynResult : IAsyncResult { 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; } private string _content; public string Content { get { return _content; } set { _content = value; } } #region IAsyncResult介面 public object AsyncState { get { return null; } } public System.Threading.WaitHandle AsyncWaitHandle { get { return null; } } public bool CompletedSynchronously { get { return false; } } public bool IsCompleted { get { return _IsCompleted; } } #endregion //在Message類中的添加訊息方法中，調用該方法，將訊息輸入到用戶端，從而實現廣播的功能 public void Send(object data) { context.Response.Write(this.Content); if (cb != null) { cb(this); } _IsCompleted = true; ; } }}3.Messages類using Handle;using System;using System.Collections.Generic;using System.Web;namespace Handle{ /// <summary> /// Summary description for Messages /// </summary> public class Messages { //記錄所有請求的用戶端 List<myAsynResult> clients = new List<myAsynResult>(); #region 實現該類的單例 private static readonly Messages _Instance = new Messages(); private Messages() { } public static Messages Instance() { return _Instance; } #endregion public void AddMessage(string content, myAsynResult asyncResult) { //當傳入的內容為"-1"時，表示為建立串連請求，即為了維持一個從用戶端到伺服器的串連而建立的串連 //此時將該串連儲存到 List<myAsynResult> clients中，待再有訊息發送過來時，該串連將會被遍曆，並且會將該串連輸出內容後，結束該串連 if (content == "-1") { clients.Add(asyncResult); } else { //將當前請求的內容輸出到用戶端 asyncResult.Content = content; asyncResult.Send(null); //否則將遍曆所有已緩衝的client,並將當前內容輸出到用戶端 foreach (myAsynResult result in clients) { result.Content = content; result.Send(null); } //清空所有緩衝 clients.Clear(); } } }}4.Default.aspx<%@ Page Language="C#" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title></title> <style type="text/css"> *{ font-size:12px;} #divResult { border:1px solid #000; width:250px; } </style> <script type="text/javascript" src="Scripts/jquery-1.10.2.min.js"></script> <script type="text/javascript" src="Scripts/myJS.js"></script></head><body> 廣播內容: <input type="text" id="content" /><br /> 訊息記錄： <div id="divResult"></div> <input type="button" id="btnSend" value="廣播" /></body></html>5.myjs類/// <reference path="jquery-1.3.2.min.js" >$(document).ready(function () { function send() { //向comet_broadcast.asyn發送請求，訊息體為文字框content中的內容，請求接收類為AsnyHandler $.post("comet_broadcast.asyn", { content: $("#content").val() }); //清空內容 $("#content").val(""); } function wait() { $.post("comet_broadcast.asyn", { content: "-1" }, function (data, status) { var result = $("#divResult"); result.html(result.html() + "<br/>" + data); //伺服器返回訊息,再次立串連 wait(); }, "html" ); } //初始化串連 wait(); $("#btnSend").click(function () { send(); }); $("#content").keypress(function (event) { if (event.keyCode == 13) { send(); } });});6.web.configIIS傳統模式配置 <system.webServer> <modules runAllManagedModulesForAllRequests="true"> <remove name="FormsAuthentication" /> <remove name="ApplicationInsightsWebTracking" /> <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" preCondition="managedHandler" /> </modules> <handlers> <add name="comet_broadcast" path="comet_broadcast.asyn" type="Handle.AsnyHandler" verb="POST,GET"/> </handlers> <validation validateIntegratedModeConfiguration="false" /> </system.webServer>相容舊版iis<system.web> <httpHandlers> <add name="comet_broadcast" path="comet_broadcast.asyn" type="Handle.AsnyHandler" verb="POST,GET"/> </httpHandlers></system.web>7.最後恭祝你身體健康，萬事如意。
asp.net web 通過IHttpAsyncHandler介面進行訊息推送
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