Using ASP.NET routing to serve static files (part 2)

Question

I had similar problem as presented here: Using ASP.NET routing to serve static files

In RouteConfig, I added the following lines:

routes.Add( "Images ABC", new Route("Images/abc/{*filename}", new ImageRouteHandler("abc")) );

routes.Add( "Images XYZ", new Route("Images/xyz/{*filename}", new ImageRouteHandler("xyz")) );

I found a pretty decent implementation of ImageRouteHandler here: http://www.phpvs.net/2009/08/06/aspnet-mvc-how-to-route-to-images-or-other-file-types/, I just added a parameter in the ctor to build the physical path...

Constraint: I have other paths in Images, beside of ABC or XYZ, that I don't want to be routed.

NOTE: I use {*filename} so I can refer to multiple segments... more info here: http://msdn.microsoft.com/en-us/library/cc668201%28v=vs.100%29.aspx#handling_a_variable_number_of_segments_in_a_url_pattern

Questions:

1. Can I combine these 2 routes in 1 single statement without violate the constraint? maybe using somekind of regular expression such as Images/[abc|xyz]/...

2. The position matters. below or above the default routing.

   routes.MapRoute( name: "Default", url: "{controller}/{action}/{id}", defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional } );

   • a) if the code is placed above of default routing, it will mess up the RedirectToAction

   • b) and if the code is placed below the default routing, it won't handle the immediate routing, ex. Images/abc/img.jpg won't be handled, but Images/abc/level1/level2/level3/img.jpg will be handled

Why? no idea.

Answer 1

Fixed by:

• Adding a IRouteConstraint. That will 2 two things... only accept IncomingRequest, and check if the folder is abc or xyz. Source: After add MapPageRoute to an asp.net mvc project, the site stops to enter in Home Controller
• Adding the following code above of default routing.

routes.Add("Images Specials", new Route("Images/{folder}/{*filename}", null, new RouteValueDictionary { { "outgoing", new ImageRouteConstraint() } }, new ImageRouteHandler()) );

• Using a ImageHandler to make looking better. Source: http://weblogs.asp.net/fredriknormen/archive/2007/11/18/asp-net-mvc-framework-create-your-own-iroutehandler.aspx, and Dynamically Rendering asp:Image from BLOB entry in ASP.NET