I had a need to access routing information that was not readily accessible (as far as I could discover). So, I wrote this helper to allow me to get the string, object pairs that Routing parses from the URL:
using System.Collections.Generic;
using System.Web;
using System.Web.Routing;
namespace BiaCreations.Helpers
{
public class RouteHelper
{
private static IDictionary<string, object> _values;
public static IDictionary<string, object> GetRouteInfo(HttpContext context)
{
if (_values == null)
{
HttpContextBase contextBase = new HttpContextWrapper(context);
RouteData data = RouteTable.Routes.GetRouteData(contextBase);
RequestContext requestContext = new RequestContext(contextBase, data);
_values = requestContext.RouteData.Values;
}
return _values;
}
public static T GetRouteInfo<T>(HttpContext context, string key)
{
IDictionary<string, object> data = GetRouteInfo(context);
if (data[key] == null)
return default(T);
object objValue = data[key];
// It appears that route values are all strings, so convert the object to a string.
if (typeof(T) == typeof(int))
{
objValue = int.Parse(data[key].ToString());
}
else if (typeof(T) == typeof(long))
{
objValue = long.Parse(data[key].ToString());
}
else if (typeof(T) == typeof(Guid))
{
objValue = new Guid(data[key].ToString());
}
return (T)objValue;
}
}
}
There are probably better ways to do this, but I needed this functionality and this works. I am open to suggestions, though, if you have a better way of accomplishing this. Oh, and my use case for needing this was that I needed value of the "id" parameter passed to a view, within an asp:substitution callback function. I know that doesn’t completely follow the MVC philosophy, but you have to work with what you’re given, and sometimes it’s worth bending rules for the benefits that output caching can provide.