UrlFor() doesn't seem to be encoding forward slashes ("/") properly. The result of the following is "/alpha/1/abc/def%26ghi%3Djkl", but should have the forward slash encoded.

gistfile1.txt

    public class AlphaController
    {
        private readonly UrlRegistry _urlregistry;

        public AlphaController(UrlRegistry urlreg)
        {
            _urlregistry = urlreg;
        }

        public string Get_Alpha_Id_Name(AlphaInputModel input)
        {
            return string.Format("Input: {0}", input.Name);
        }

        public string Get_Alpha()
        {
            return _urlregistry.UrlFor(new AlphaInputModel { Id = 1, Name = "abc/def&ghi=jkl" });
        }
    }

    public class AlphaInputModel
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }