MVC contraint for anything that is only numeric

Question

Hi,

I need help with a constraint:

Constraints = new RouteValueDictionary(new { filename = @"" })

It has to be only numeric (no letters, slashes etc).

Answer 1

I'm not sure I understood the question, but as far as I know, you can simply provide regular expressions in the Constraints dictionary.

I think there is even an example for that in the MSDN refguide:

reportRoute.Constraints = new RouteValueDictionary { 
  { "locale", "[a-z]{2}-[a-z]{2}" }, 
  { "year", @"\d{4}" } };

based on that, I think what you have to write:

Constraints = new RouteValueDictionary(new { filename = @"\d+" })