Async http request

http://blog.stephencleary.com/2012/07/dont-block-on-async-code.html


using System;

using System.Diagnostics;

using System.Net.Http;

using System.Threading.Tasks;

​

namespace AsyncTests

{

    class Program

    {

        static async Task<string> GetBookAsync(string url)

        {

            using (var client = new HttpClient())

            {

                var response = await client.GetAsync(url);

                if (response.IsSuccessStatusCode)

                {

                    // by calling .Result you are performing a synchronous call

                    var responseContent = response.Content;

​

                    // by calling .Result you are synchronously reading the result

                    return await responseContent.ReadAsStringAsync();

                }

            }

​

            return null;

        }

​

        static void Main(string[] args)

        {

            // Async

            Stopwatch sw2 = new Stopwatch();

​

            sw2.Start();

            var result1 = GetBookAsync("https://www.googleapis.com/books/v1/volumes?q=isbn:0747532699");

            var result2 = GetBookAsync("https://www.googleapis.com/books/v1/volumes?q=isbn:1101875100");

            var result3 = GetBookAsync("https://www.googleapis.com/books/v1/volumes?q=isbn:1501115634");

            var result4 = GetBookAsync("https://www.googleapis.com/books/v1/volumes?q=isbn:0525478817");

            sw2.Stop();

​

            Console.WriteLine(sw2.ElapsedTicks);

​

            var allDone = Task.WhenAll(result1, result2, result3, result4);

            foreach (var result in allDone.Result)

            {

                // Callbacks are executed here

            }

​

            Console.ReadLine();

        }

    }

}