Q:

Exclude a Controller from Default Route C# MVC

I'd like to prevent a route from handling one of my controllers, called MyController.
I thought this might work, but it doesn't:
routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{urlId}",
    defaults: new { controller = "Home", action = "Index", urlId = UrlParameter.Optional },
    constraints: new { controller = @"^(!?MyController)$" }
);

Sadly it stops me from navigating to any of my controllers.
I can only get it not to match if the controller contains MyController using (!?MyController.*) but this isn't matching it exactly.
All of the regex testers I've tried suggest that it should only match exactly MyController.

A:

Found this here http://stephenwalther.com/archive/2008/08/07/asp-net-mvc-tip-30-create-custom-route-constraints
Create the NotEqual class to use in your constraints
public class NotEqual : IRouteConstraint
{
  private string _match = String.Empty;

  public NotEqual(string match)
  {
    _match = match;
  }

  public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
  {
    return String.Compare(values[parameterName].ToString(), _match, true) != 0;
  }
}

Then use the class in your RouteConfig
routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{urlId}",
    defaults: new { controller = "Home", action = "Index", urlId = UrlParameter.Optional },
    constraints: new { controller = new NotEqual("MyController") }
);

