about IHttpHandler
// Attempt to cast HttpHandler as a Page. // HttpContext.Current :Get the HttpContext object for the current http request // HttpContext. : self haven't other function ,only through the Current property to get the specific HttpContext Page executingPage = HttpContext.Current.Handler as Page; //HttpContext.Current.Handler return an IHttpHandler(System.Web.IHttpHandler which on duty to handl with the http Request获取一个值，该值指示其他请求是否可以使用 IHttpHandler 实例。
// Name this C# file HandlerTest.cs and compile it with the// command line: csc /t:library /r:System.Web.dll HandlerTest.cs.// Copy HandlerTest.dll to your \bin directory.using System.Web;namespace HandlerExample
{
public class MyHttpHandler : IHttpHandler
{
// Override the ProcessRequest method. public void ProcessRequest(HttpContext context) { context.Response.Write("<H1>This is an HttpHandler Test.</H1>"); context.Response.Write("<p>Your Browser:</p>"); context.Response.Write("Type: " + context.Request.Browser.Type + "<br>"); context.Response.Write("Version: " + context.Request.Browser.Version);
} // Override the IsReusable property. public bool IsReusable { get { return true; } } }
}/*______________________________________________________________To use this handler, include the following lines in a Web.config file.<configuration> <system.web> <httpHandlers> <add verb="*" path="handler.aspx" type="HandlerExample.MyHttpHandler,HandlerTest"/> </httpHandlers> </system.web></configuration>*/本例中：客户端（浏览器）对handler.aspx的请求均由包含在程序集 HandlerTest.dll 中的命名空间 HandlerExample 中的 MyHttpHandler 类提供服务，所以尽管handler.aspx页面内没有内容，还是能在该页面被请求时显示内容，完全是HandlerTest.dll在处理浏览器对handler.aspx请求，HandlerTest.dll 决定了要返回给浏览器什么样的，什么内容。
事实上即使handler.aspx中有aspbutton等等也完全不会被理会，根本在浏览器中得不到显示。
本例中：
default.aspx中在浏览器端的“源代码”：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
zzz <div>
<hr />
<a id="HyperLink1" href="fold1/handler.aspx">redirect to handler.aspx</a>
</div>
</form>
</body>
</html>
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而handler.aspx在浏览器端的源代码：
<H1>This is an HttpHandler Test.</H1><p>Your Browser:</p>Type: IE6<br>Version: 6.0
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这样是不是会增加“效率”？？？？
1.// Name this C# file HandlerTest.cs and compile it with the
// command line: csc /t:library /r:System.Web.dll HandlerTest.cs.
// Copy HandlerTest.dll to your \bin directory.
2.To use this handler, include the following lines in a Web.config file.
<configuration>
<system.web>
<httpHandlers>
<add verb="*" path="handler.aspx" type="HandlerExample.MyHttpHandler,HandlerTest"/>
</httpHandlers>
</system.web>
</configuration>
*/
testIHttpHandler
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