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    <p>Yeah, I noticed that, too. Perhaps there is a built-in ASP.NET way to do this, but the trick for me was to create a new class derived from IRouteHandler:</p> <pre><code>using System; using System.IO; using System.Reflection; using System.Text.RegularExpressions; using System.Web; using System.Web.Routing; namespace MyNamespace { class GenericHandlerRouteHandler : IRouteHandler { private string _virtualPath; private Type _handlerType; private static object s_lock = new object(); public GenericHandlerRouteHandler(string virtualPath) { _virtualPath = virtualPath; } #region IRouteHandler Members public System.Web.IHttpHandler GetHttpHandler(RequestContext requestContext) { ResolveHandler(); IHttpHandler handler = (IHttpHandler)Activator.CreateInstance(_handlerType); return handler; } #endregion private void ResolveHandler() { if (_handlerType != null) return; lock (s_lock) { // determine physical path of ashx string path = _virtualPath.Replace("~/", HttpRuntime.AppDomainAppPath); if (!File.Exists(path)) throw new FileNotFoundException("Generic handler " + _virtualPath + " could not be found."); // parse the class name out of the .ashx file // unescaped reg-ex: (?&lt;=Class=")[a-zA-Z\.]* string className; Regex regex = new Regex("(?&lt;=Class=\")[a-zA-Z\\.]*"); using (var sr = new StreamReader(path)) { string str = sr.ReadToEnd(); Match match = regex.Match(str); if (match == null) throw new InvalidDataException("Could not determine class name for generic handler " + _virtualPath); className = match.Value; } // get the class type from the name Assembly[] asms = AppDomain.CurrentDomain.GetAssemblies(); foreach (Assembly asm in asms) { _handlerType = asm.GetType(className); if (_handlerType != null) break; } if (_handlerType == null) throw new InvalidDataException("Could not find type " + className + " in any loaded assemblies."); } } } } </code></pre> <p>To create a route for an .ashx:</p> <pre><code>IRouteHandler routeHandler = new GenericHandlerRouteHandler("~/somehandler.ashx"); Route route = new Route("myroute", null, null, null, routeHandler); RouteTable.Routes.Add(route); </code></pre> <p>The code above may need to be enhanced to work with your route arguments, but it's starting point. Comments welcome.</p>
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