Query string not working while using attribute routing

Question

I\'m using System.Web.Http.RouteAttribute and System.Web.Http.RoutePrefixAttribute to enable cleaner URLs for my Web API 2 application. For most of

Answer 1

Here's a slight deviant of @bhargav kishore mummadireddy's answer, but an important deviation. His answer will default the querystring values to an actual non-empty value. This answer will default them to empty.

It allows you to call the controller through path routing, or using the querystring. Essentially, it sets the default value of the querystring to empty, meaning it will always be routed.

This was important to me, because I want to return 400 (Bad Request) if a querystring is not specified, rather than having ASP.NET return the "could not locate this method on this controller" error.

[RoutePrefix("api/AppUsageReporting")]
public class AppUsageReportingController : ApiController
    {
        [HttpGet]
        // Specify default routing parameters if the parameters aren't specified
        [Route("UsageAggregationDaily/{userId=}/{startDate=}/{endDate=}")]
        public async Task UsageAggregationDaily(string userId, DateTime? startDate, DateTime? endDate)
        {
            if (String.IsNullOrEmpty(userId))
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest, $"{nameof(userId)} was not specified.");
            }

            if (!startDate.HasValue)
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest, $"{nameof(startDate)} was not specified.");
            }

            if (!endDate.HasValue)
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest, $"{nameof(endDate)} was not specified.");
            }
        }
    }