ASP.NET WebApi - Multiple GET actions in one controller

Question

I have Users controller and basic REST pattern is working just fine. However I need one additional pattern users/{id}/usergroups that will return all u

Answer 1

You can either: just define one Get method, and have an optional Id Parameter like this:

public IEnumerable GetUsers(int? id){
    if (id.HasValue)
    {
         //return collection of one item here
    }
    //return collection of all items here
}

Or you can have multiple Gets decorated with the ActionName Attribute

// GET api/Users
[ActionName("GetAll")]
public IEnumerable GetUsers()

// GET api/Users/5
[ActionName("Get")]
public User GetUser(int id) // THIS IS NO LONGER IN CONFLICT

And then define the routes on your RouteConfig like so:

routes.MapHttpRoute(
            name: "DefaultApiWithAction",
            routeTemplate: "api/{controller}/{action}/{id}",
            defaults: new { id = RouteParameter.Optional }
            );