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copied!<p>Here's an example of a route like yours, with a constraint on the number:</p> <pre><code>routes.MapRoute( "Question", "questions/{questionID}", new { controller = "StackOverflow", action = "Question" }, new { questionID = @"\d+" } //Regex constraint specifying that it must be a number. ); </code></pre> <p>Here we set the questionID to have at least one number. This will also block out any urls containing anything but an integer, and also prevents the need for a nullable int.</p> <p><em>Note:</em> This does not take into account numbers that larger than the range of Int32 (-2147483647 - +2147483647). I leave this as an exercise to the user to resolve. :)</p> <p>If the user enters the url "questions/foo", they will not hit the Question action, and fall through it, because it fails the parameter constraint. You can handle it further down in a catchall/default route if you want:</p> <pre><code>routes.MapRoute( "Catchall", "{*catchall}", // This is a wildcard routes new { controller = "Home", action = "Lost" } ); </code></pre> <p>This will send the user to the Lost action in the Home controller. More information on the wildcard can be found <a href="http://richarddingwall.name/2008/08/09/three-common-aspnet-mvc-url-routing-issues/" rel="nofollow noreferrer">here</a>.</p> <p><strong>NB: The Catchall should reside as the LAST route.</strong> Placing it further up the chain will mean that this will handle all others below it, given the lazy nature of routes in ASP.NET MVC.</p>

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