Can route groups be implemented in an ASP.NET controller?

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Yes, route groups can be implemented in an ASP.NET controller using attribute routing. You can group related routes together, define common route prefixes or constraints for the group, and apply filters to the whole group. Here's an example:

[RoutePrefix("api/users")]
public class UsersController : ApiController
{
    [HttpGet]
    [Route("")]
    public IHttpActionResult GetUsers() { ... }  // GET api/users

    [HttpGet]
    [Route("{id:int}")]
    public IHttpActionResult GetUser(int id) { ... }  // GET api/users/{id}

    [HttpPost]
    [Route("")]
    public IHttpActionResult CreateUser(UserDto user) { ... } // POST api/users

    [HttpPut]
    [Route("{id:int}")]
    public IHttpActionResult UpdateUser(int id, UserDto user) { ... }  // PUT api/users/{id}

    [HttpDelete]
    [Route("{id:int}")]
    public IHttpActionResult DeleteUser(int id) { ... }  // DELETE api/users/{id}
}

In this example, all the routes that start with "api/users" are grouped under the UsersController using the [RoutePrefix] attribute. The [HttpGet], [HttpPost], etc., attributes define the HTTP methods for each action, and the [Route] attribute defines the additional route segments and optional constraints. The :int constraint for the id parameter ensures that it can only be an integer value.