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POHow to Make ASP.NET MVC Recognize IHttpAsyncHandler from IRouteHandler.GetHttpHandler()?
 

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  1. POHow to Make ASP.NET MVC Recognize IHttpAsyncHandler from IRouteHandler.GetHttpHandler()?
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    <p>In this <a href="https://stackoverflow.com/questions/275545/does-aspnet-mvc-framework-support-asynchronous-page-execution">question &amp; answer</a>, I found one way to make ASP.NET MVC support asynchronous processing. However, I cannot make it work.</p> <p>Basically, the idea is to create a new implementation of IRouteHandler which has only one method <strong><em>GetHttpHandler</em></strong>. The <strong><em>GetHttpHandler</em></strong> method should return a IHttpAsyncHandler implementation instead of just IHttpHandler, because IHttpAsyncHandler has Begin/EndXXXX pattern API.</p> <pre><code>public class AsyncMvcRouteHandler : IRouteHandler { public IHttpHandler GetHttpHandler(RequestContext requestContext) { return new AsyncMvcHandler(requestContext); } class AsyncMvcHandler : IHttpAsyncHandler, IRequiresSessionState { public AsyncMvcHandler(RequestContext context) { } // IHttpHandler members public bool IsReusable { get { return false; } } public void ProcessRequest(HttpContext httpContext) { throw new NotImplementedException(); } // IHttpAsyncHandler members public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData) { throw new NotImplementedException(); } public void EndProcessRequest(IAsyncResult result) { throw new NotImplementedException(); } } } </code></pre> <p>Then, in the RegisterRoutes method of file Global.asax.cs, register this class <strong><em>AsyncMvcRouteHandler</em></strong>. public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}");</p> <pre><code> routes.Add(new Route("{controller}/{action}/{id}", new AsyncMvcRouteHandler()) { Defaults = new RouteValueDictionary(new { controller = "Home", action = "Index", id = "" }), }); } </code></pre> <p>I set breakpoint at <strong><em>ProcessRequest</em></strong>, <strong><em>BeginProcessRequest</em></strong> and <strong><em>EndProcessRequest</em></strong>. Only <strong><em>ProcessRequest</em></strong> is executed. In another word, even though <strong><em>AsyncMvcHandler</em></strong> implements <strong><em>IHttpAsyncHandler</em></strong>. ASP.NET MVC doesn't know that and just handle it as an IHttpHandler implementation.</p> <p>How to make ASP.NET MVC treat <strong><em>AsyncMvcHandler</em></strong> as <strong><em>IHttpAsyncHandler</em></strong> so we can have asynchronous page processing?</p>
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