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    <p>If you're just looking to support lower-case routes (basically making your routes case-insensitive), you might check out the below. We're currently using this and it works great.</p> <p>Firstly you will need a RouteExtensions.cs file, or named anything you like with the following (compatible as at ASP.NET MVC RC1):</p> <pre><code>using System; using System.Web.Mvc; using System.Web.Routing; namespace MyMvcApplication.App.Helpers { public class LowercaseRoute : System.Web.Routing.Route { public LowercaseRoute(string url, IRouteHandler routeHandler) : base(url, routeHandler) { } public LowercaseRoute(string url, RouteValueDictionary defaults, IRouteHandler routeHandler) : base(url, defaults, routeHandler) { } public LowercaseRoute(string url, RouteValueDictionary defaults, RouteValueDictionary constraints, IRouteHandler routeHandler) : base(url, defaults, constraints, routeHandler) { } public LowercaseRoute(string url, RouteValueDictionary defaults, RouteValueDictionary constraints, RouteValueDictionary dataTokens, IRouteHandler routeHandler) : base(url, defaults, constraints, dataTokens, routeHandler) { } public override VirtualPathData GetVirtualPath(RequestContext requestContext, RouteValueDictionary values) { VirtualPathData path = base.GetVirtualPath(requestContext, values); if (path != null) path.VirtualPath = path.VirtualPath.ToLowerInvariant(); return path; } } public static class RouteCollectionExtensions { public static void MapRouteLowercase(this RouteCollection routes, string name, string url, object defaults) { routes.MapRouteLowercase(name, url, defaults, null); } public static void MapRouteLowercase(this RouteCollection routes, string name, string url, object defaults, object constraints) { if (routes == null) throw new ArgumentNullException("routes"); if (url == null) throw new ArgumentNullException("url"); var route = new LowercaseRoute(url, new MvcRouteHandler()) { Defaults = new RouteValueDictionary(defaults), Constraints = new RouteValueDictionary(constraints) }; if (String.IsNullOrEmpty(name)) routes.Add(route); else routes.Add(name, route); } } } </code></pre> <p>Then a using reference in your Global.asax.cs file to the above class, and you’re all set to create a lowercase route. You can see a below example of a lowercase route and anytime this route is called your URL will be lowercased.</p> <pre><code> routes.MapRouteLowercase( "Default", // Route name "{controller}/{action}/{id}", // URL with parameters new {controller = "Home", action = "index", id = ""} // Parameter defaults ); </code></pre> <p>and optionally if you are interested in converting any incoming URL’s to lowercase (manually typed by the user or called links) you can use this in your Application_BeginRequest() method (Remember, this is not needed for lowercase routes themselves, the code above will handle that):</p> <pre><code> protected void Application_BeginRequest(Object sender, EventArgs e) { // If upper case letters are found in the URL, redirect to lower case URL. // Was receiving undesirable results here as my QueryString was also being converted to lowercase. // You may want this, but I did not. //if (Regex.IsMatch(HttpContext.Current.Request.Url.ToString(), @"[A-Z]") == true) //{ // string LowercaseURL = HttpContext.Current.Request.Url.ToString().ToLower(); // Response.Clear(); // Response.Status = "301 Moved Permanently"; // Response.AddHeader("Location", LowercaseURL); // Response.End(); //} // If upper case letters are found in the URL, redirect to lower case URL (keep querystring the same). string lowercaseURL = (Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Authority + HttpContext.Current.Request.Url.AbsolutePath); if (Regex.IsMatch(lowercaseURL, @"[A-Z]")) { lowercaseURL = lowercaseURL.ToLower() + HttpContext.Current.Request.Url.Query; Response.Clear(); Response.Status = "301 Moved Permanently"; Response.AddHeader("Location", lowercaseURL); Response.End(); } } </code></pre> <p>Answer originally came from <a href="https://stackoverflow.com/questions/878578/how-can-i-have-lowercase-routes-in-asp-net-mvc">this</a> SO post.</p> <p>The content on this answer was taken from a blog post that is no longer available but can be viewed on archive.org <a href="http://web.archive.org/web/20100726101930/http://goneale.com/2008/12/19/lowercase-route-urls-in-aspnet-mvc" rel="nofollow noreferrer">here</a>.</p>
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    1. POUsing regular expressions in .NET MVC route to handle upper-case characters
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