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POHow do I handle an exception in an ASP.NET MVC controller factory
 

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  1. POHow do I handle an exception in an ASP.NET MVC controller factory
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    <p>I have an ASP.NET MVC 2 application with a custom StructureMap controller factory to handle dependency injection for my controllers:</p> <pre><code>public class StructureMapControllerFactory : DefaultControllerFactory { public override IController CreateController(RequestContext context, string controllerName) { Type controllerType = base.GetControllerType(context, controllerName); return ObjectFactory.GetInstance(controllerType) as IController; } } </code></pre> <p>I would like to know how I can handle exceptions in this controller factory so that they can be redirected to the ~/Views/Shared/Error.aspx in the same way as they are in a controller that has the HandleError attribute. Currently exceptions don't do this despite having the CustomErrors attribute set to "On".</p> <p>At the moment I can generate such an exception using a URL like "~/DoesNotExist/edit/1". With the default route:</p> <pre><code>routes.MapRoute( "Default", // Route name "{controller}/{action}/{id}", // URL with parameters new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults ); </code></pre> <p>MVC matches this route and passes controller name "DoesNotExist" to my controller factory. The GetControllerType then returns null and causes a null reference exception in the call to StructureMap. I would then like to be able to handle this exception.</p> <p>Note that adding a subsequent catch all route will not resolve this problem - MVC matches the default route.</p> <p>I know I could solve this particular problem by putting constraints on the default route for controller but the question is more general about how I can use the normal MVC ~/Views/Shared/Error.aspx in the factory.</p> <p>Note that I don't want the answer to require tight coupling of the controller factory to the particular MVC application. Ideally this factory should be in a referenced assembly not in the same solution.</p>
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