Ihttphandler - Can ASP.NET Routing be used to create "clean" URLs for .ashx (IHttpHander) handlers. Three common ASP.NET MVC URL routing issues | Richard Dingwall. Following on from my post last week about consistent ASP.NET MVC URLs, here are a few tips that helped when I was first getting started with ASP.NET MVC and its URL routing system. Have you got your routes registered in the correct order? ASP.NET MVC checks incoming URL requests against routes in the order they were registered, so you need to add them in the order of most to least specific. Thus, even though you might have a very specific route defined later on that matches the incoming URL perfectly, ASP.NET MVC will choose whichever route matches first.
You can’t just drop in extra rules at the bottom of the list and expect them to work. For example, if you have ten routes, with an {*anything} pattern registered first, the other nine routes will always be ignored, because the anything route will always be matched first. In a real scenario, one application I am working on uses the default ASP.NET MVC route for most pages, but uses some extra routing rules as well. August 9, 2008. ASP.NET Routing. The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location. ASP.NET routing enables you to use URLs that do not have to map to specific files in a Web site. Because the URL does not have to map to a file, you can use URLs that are descriptive of the user's action and therefore are more easily understood by users. In an ASP.NET application that does not use routing, an incoming request for a URL typically maps to a physical file that handles the request, such as an .aspx file.
In ASP.NET routing, you can define URL patterns that map to request-handler files, but that do not necessarily include the names of those files in the URL. For example, in the request for the routing parser can pass the values Products, show, and beverages to the page handler. This topic contains the following sections: Typical URL Patterns in MVC Applications. SEO Friendly Url's in ASP.NET MVC - Include a description. Routing Regression With Two Consecutive Optional Url Parameters. It pains me to say it, but ASP.NET MVC 3 introduces a minor regression in routing from ASP.NET MVC 2. The good news is that there’s an easy workaround.
The bug manifests when you have a route with two consecutive optional URL parameters and you attempt to use the route to generate an URL. The incoming request matching behavior is unchanged and continues to work fine. For example, suppose you have the following route defined: routes.MapRoute("by-day", "archive/{month}/{day}", new { controller = "Home", action = "Index", month = UrlParameter.Optional, day = UrlParameter.Optional }); Notice that the month and day parameters are both optional.
Now suppose you have the following view code to generate URLs using this route. @Url.RouteUrl("by-day", new { month = 1, day = 23 })@Url.RouteUrl("by-day", new { month = 1 })@Url.RouteUrl("by-day", null) /archive/1/23 /archive/1 /archive But in ASP.NET MVC 3, you get: /archive/1/23 - /archive/1 In the last case, the value returned is nullbecause of this bug.