MVC route segment with a question mark?

Question

In this article by Sam Shaffron, he mentions that Qaru has a route that looks like this:

questions/{id}/{title?}

This is a missprint? What does this question mark do?

+5

Brent arias Jun 28 '12 at 20:48

2 answers

StackOverflow uses attribute-based routing , so I assume the question mark indicates that the route parameter is optional.

+1

Kyle trauberman Jun 28 '12 at 20:57

Robert Harvey · Accepted Answer · 2012-06-28T21:04:44+0000

[Url("store/{category?}")]
public ActionResult Products(string category)
{
    return View();
}

'?' A sign at the end of the parameter {category?}indicates that it is optional. UrlParameter.Optionalwill be the default value for it.