C # HttpHandler code explanation for asynchronous listener requests

Server-side programming under high concurrency, when encountering performance bottlenecks, is often the result of synchronization. Asynchronous is required when listening for HTTP requests.

Base class for asynchronous listener HTTP requests:

Using system;using system.collections.generic;using system.linq;using system.text;using System.Threading;using System.web;namespace myhandler{Public abstract class Httpasynchandler:ihttpasynchandler, IAsyncResult {PU Blic IAsyncResult BeginProcessRequest (HttpContext context, AsyncCallback cb, Object Extradata) {_callba            CK = CB;            _context = context;            _completed = false;            _state = this;            ThreadPool.QueueUserWorkItem (New WaitCallback (doprocess), this);        return this;            } public void EndProcessRequest (IAsyncResult result) {} public bool IsReusable {        get {return false;}        } public abstract void Beginprocess (HttpContext context);                public void Endprocess () {//Prevents multiple endprocess if (!_completed) {                    try {_completed = true; if (_callbacK! = null) {_callback (this); }} catch (Exception) {}}} private static void Doprocess (object            State) {Httpasynchandler handler = (Httpasynchandler) state; Handler.        Beginprocess (Handler._context);        } public void ProcessRequest (HttpContext context) {throw new NotImplementedException ();        } private bool _completed;        Private Object _state;        Private AsyncCallback _callback;        Private HttpContext _context;        Public object AsyncState {get {return _state;}        } public WaitHandle AsyncWaitHandle {get {throw new NotImplementedException ();}        } public bool completedsynchronously {get {return false;}        } public bool IsCompleted {get {return _completed;} }    }}

Add TestHandler.cs:

Using system;using system.collections.generic;using system.linq;using system.text;using System.IO;namespace myhandler{public    class Testhandler:httpasynchandler    {public        override void Beginprocess ( System.Web.HttpContext context)        {            try            {                StreamReader sr = new StreamReader (context. Request.inputstream);                String reqstr = Sr. ReadToEnd ();                Context. Response.Write ("Get your input:" + Reqstr + "at" + DateTime.Now.ToString ());            }            catch (Exception ex)            {                context. Response.Write ("Exception eccurs ex info:" + ex.) Message);            }            Finally            {                endprocess ();////finally don't forget end            }    }}}

Introduce MyHandler.dll at the site and modify the Webconfig as follows:

<?xml version= "1.0" encoding= "Utf-8"?><configuration>  <system.web>    <compilation Debug= "true" targetframework= "4.0"/>    <pages validaterequest= "false" controlrenderingcompatibilityversion= "3.5" clientidmode= "Autoid"/> 
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