C# Anonymous Object Tip

I was in the middle of writing a URL helper for the default route in MVC, with this signature:

static string Default(this UrlHelper url, string controller, string action, object id)

My initial implementation looked like this:

static string Default(this UrlHelper url, string controller, string action, object id)
{
    return url.RouteUrl("default", new { controller = controller,
                                         action = action,
                                         id = id });
}

That's when Resharper chimed in and grayed some things out for me, teaching me a new trick: If you want your anonymous object field names to be the same as the value you're passing in, you don't need the name.

The abbreviated version looks like this:

static string Default(this UrlHelper url, string controller, string action, object id)
{
    return url.RouteUrl("default", new { controller, action, id });
}