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The Controller For favicon.ico Does Not Implement IController

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In an application using Controller factory, i encountered an error as stated in the title. My MVC does not have a favicon.ico. The solution is to add a parameter constraint that does not allow .ico filenames in your routes. I got the solution from forums.asp.net 
routes.MapRoute(  
           "Default",                       // Route name  
           "{controller}/{action}/{id}",              // URL with parameters  
           new { controller = "ProductView", action = "Index", id = "" }, // Parameter defaults  
           new { controller = @"[^\.]*" }    // Parameter constraints (regex/string expression)  
         );

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