Asp.Net MVC: How do I enable dashes in my urls?

You can use the ActionName attribute like so:

[ActionName("My-Action")]
public ActionResult MyAction() {
    return View();
}

Note that you will then need to call your View file "My-Action.cshtml" (or appropriate extension). You will also need to reference "my-action" in any Html.ActionLink methods.

There isn't such a simple solution for controllers.

Edit: Update for MVC5

Enable the routes globally:

public static void RegisterRoutes(RouteCollection routes)
{
    routes.MapMvcAttributeRoutes();
    // routes.MapRoute...
}

Now with MVC5, Attribute Routing has been absorbed into the project. You can now use:

[Route("My-Action")]

On Action Methods.

For controllers, you can apply a RoutePrefix attribute which will be applied to all action methods in that controller:

[RoutePrefix("my-controller")]

One of the benefits of using RoutePrefix is URL parameters will also be passed down to any action methods.

[RoutePrefix("clients/{clientId:int}")]
public class ClientsController : Controller .....

Snip..

[Route("edit-client")]
public ActionResult Edit(int clientId) // will match /clients/123/edit-client

You could create a custom route handler as shown in this blog:

http://blog.didsburydesign.com/2010/02/how-to-allow-hyphens-in-urls-using-asp-net-mvc-2/

public class HyphenatedRouteHandler : MvcRouteHandler{
        protected override IHttpHandler  GetHttpHandler(RequestContext requestContext)
        {
            requestContext.RouteData.Values["controller"] = requestContext.RouteData.Values["controller"].ToString().Replace("-", "_");
            requestContext.RouteData.Values["action"] = requestContext.RouteData.Values["action"].ToString().Replace("-", "_");
            return base.GetHttpHandler(requestContext);
        }
    }

...and the new route:

routes.Add(
            new Route("{controller}/{action}/{id}", 
                new RouteValueDictionary(
                    new { controller = "Default", action = "Index", id = "" }),
                    new HyphenatedRouteHandler())
        );

A very similar question was asked here: ASP.net MVC support for URL's with hyphens

You could write a custom route that derives from the Route class GetRouteData to strip dashes, but when you call the APIs to generate a URL, you'll have to remember to include the dashes for action name and controller name.

That shouldn't be too hard.