Kurz ASP.NET Web API - třída ProductsController

gistfile1.cs

    public class ProductsController : ApiController
    {

        private static Dictionary<int, Product> products = new Dictionary<int, Product>();

        static ProductsController()
        {
            products.Add(1, new Product() { Name = "Rohlík", Category = "Jídlo", UnitsOnStock = 100 });
            products.Add(2, new Product() { Name = "Hrábě", Category = "Nářadí", UnitsOnStock = 5 });
            products.Add(3, new Product() { Name = "Coca Cola", Category = "Nápoje", UnitsOnStock = 10 });
        }


        // GET api/<controller>
        public IEnumerable<KeyValuePair<int, Product>> Get(
            string name = null, 
            string category = null, 
            int? minUnitsOnStock = null, 
            int? maxUnitsOnStock = null)
        {
            IEnumerable<KeyValuePair<int, Product>> data = products;

            if (!string.IsNullOrEmpty(name))
            {
                data = data.Where(d => d.Value.Name.Contains(name));
            }
            if (!string.IsNullOrEmpty(category))
            {
                data = data.Where(d => d.Value.Category == category);
            }
            if (minUnitsOnStock != null)
            {
                data = data.Where(d => d.Value.UnitsOnStock > minUnitsOnStock.Value);
            }
            if (maxUnitsOnStock != null)
            {
                data = data.Where(d => d.Value.UnitsOnStock < maxUnitsOnStock.Value);
            }

            return data;
        }


        // GET api/<controller>/5
        public HttpResponseMessage Get(int id)
        {
            var response = new HttpResponseMessage(HttpStatusCode.OK);
            response.Content = new ObjectContent(typeof(Product), products[id], new JsonMediaTypeFormatter());
            response.Headers.Add("X-Entity-Id", id.ToString());
            return response;

            //var response = Request.CreateResponse(HttpStatusCode.OK, products[id]);
            //response.Headers.Add("X-Entity-Id", id.ToString());
            //return response;
        }

        // POST api/<controller>
        public HttpResponseMessage Post(Product value)
        {
            var id = products.Keys.DefaultIfEmpty(0).Max() + 1;
            products.Add(id, value);

            var response = new HttpResponseMessage(HttpStatusCode.Redirect);
            response.Headers.Location = new Uri("/api/Products/" + id, UriKind.Relative);
            return response;
        }

        // PUT api/<controller>/5
        public void Put(int id, Product value)
        {
            if (!products.ContainsKey(id))
            {
                throw new HttpResponseException(HttpStatusCode.NotFound);
            }
            products[id] = value;
        }

        // DELETE api/<controller>/5
        public void Delete(int id)
        {
            if (!products.Remove(id))
            {
                throw new HttpResponseException(HttpStatusCode.NotFound);   
            }
        }
    }