C# HttpHandler 非同步監聽請求的代碼詳解

在高並發下的伺服器端編程，當遇到效能瓶頸時候，往往是同步帶來的。監聽HTTP請求的時候，非同步是必須的。

非同步監聽HTTP請求的基類：

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    {        public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)        {            _callback = 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()        {            //防止多次進行多次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; }        }    }}

添加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();////最後別忘了end            }        }    }}

在網站引入MyHandler.dll，並按照如下修改 WebConfig：

<?xml version="1.0" encoding="utf-8"?><configuration>  <system.web>    <compilation debug="true" targetFramework="4.0"/>    <pages validateRequest="false" controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"/>    <httpRuntime requestValidationMode="2.0"/>    <customErrors mode="Off"/>    <httpHandlers>      <add verb="*" path="Test.aspx" type="MyHandler.TestHandler, MyHandler"/>    </httpHandlers>  </system.web></configuration>

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