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POFallback Route in ASP MVC if action doesn't exist
 

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    <p>The default route in MVC <code>{controller}/{action}/{id}</code> is for the most part quite helpful as is being able to set a default if the incoming url doesn't include a parameter but is there also a way to specify a default action for when an action doesn't exist on a controller?</p> <p>What I want to achieve is being able to have controllers with several specific actions and then its own catchall which uses the url to grab content from a basic CMS.</p> <p>For example a products controller would be something like:</p> <pre><code>public class ProductsController: Controller{ public ActionResult ProductInfo(int id){...} public ActionResult AddProduct(){...} public ActionResult ContentFromCms(string url){...} } </code></pre> <p>Where the default route would handle <code>/Products/ProductInfo/54</code> etc but a request url of <code>/Products/Suppliers/Acme</code> would return <code>ContentFromCms("Suppliers/Acme");</code> (sending the url as a parameter would be nicer but not needed and a parameterless method where I get it from Request would be fine).</p> <p>Currently I can think of two possible ways to achieve this, either:</p> <p>Create a new constraint which reflects over a controller to see if it does have an action of a given name and use this in the <code>{controller}/{action}/{id}</code> route thus allowing me to have a more general catchall like <code>{controller}/{*url}</code>.</p> <p>Override <code>HandleUnknownAction</code> on the controller.</p> <p>The first approach seems like it would be quite a roundabout way of checking this while for the second I don't know the internals of MVC and Routing well enough to know how to proceed.</p> <p><strong>Update</strong></p> <p>There's not been any replies but I thought I'd leave my solution incase anyone finds this in future or for people to suggest improvements/better ways</p> <p>For the controllers I that wanted to have their own catchall I gave them an interface </p> <pre><code>interface IHasDefaultController { public string DefaultRouteName { get; } System.Web.Mvc.ActionResult DefaultAction(); } </code></pre> <p>I then derived from the ControllerActionInvoker and overrode FindAction. This calls the base FindAction then, if the base returns null and the controller impliments the interface I call FindAction again with the default actionname. </p> <pre><code>protected override ActionDescriptor FindAction(ControllerContext controllerContext, ControllerDescriptor controllerDescriptor, string actionName) { ActionDescriptor foundAction = base.FindAction(controllerContext, controllerDescriptor, actionName); if (foundAction == null &amp;&amp; controllerDescriptor.ControllerType.GetInterface("Kingsweb.Controllers.IWikiController") != null) { foundAction = base.FindAction(controllerContext, controllerDescriptor, "WikiPage"); } return foundAction; } </code></pre> <p>As I also want parameters from the routing I also replace the RouteData at the start of the default Actionresult on the controller</p> <pre><code>ControllerContext.RouteData = Url.RouteCollection[DefaultRouteName].GetRouteData(HttpContext); </code></pre>
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