ASP.NET MVC controller parameter optional (i.e Index(int? id))

Question

I have the following scenario: my website displays articles (inputted by an admin. like a blog).

So to view an article, the user is referred to Home/Articles/{articl

Answer 1

Define a default value for the Id that you know indicated no value was supplied - usually 0.

public ActionResult Articles([DefaultValue(0)]int Id)
{
  if (Id == 0)
    // show all
  else
    // show selected
..