Constraining Routes in MVC to an Enum the Easy Way

simple way to constrain a route to only allow enum values

Say I have the following enum:
public enum SearchType { Facilities, Courses, Exercises};

And I only want those the be available in route Search/{SearchType}. I could constrain it manually with a string, but then what if the enum changes and I have this in a bunch of routes? Here is a simple way to accomplish this constraint:
public static void RegisterRoutes(RouteCollection routes)
    List searchTypeL = new List();
    foreach (Enums.SearchType type in 
    { searchTypeL.Add(type.ToString()); }
    string searchTypes = string.Join("|", searchTypeL);
        new { controller = "Search", action = "Index" },
        new { type = searchTypes }

Very basic, all this does is enumerate through your enum and create a simple string to filter with.
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