// @nuget: FluentAssertions

​

using System;

​

namespace Try_More_On_IEnumerable

{

    class Program

    {

        static void Main(string[] args)

        {

            T10测试网络连接.Run();

            Console.WriteLine($"运行成功,{DateTime.Now:O}");

        }

    }

}

​

namespace Try_More_On_IEnumerable

{

    using System;

    using System.Collections.Generic;

    using System.Net.Http;

    using System.Threading.Tasks;

​

    public class T10测试网络连接

    {

        public static async Task Run()

        {

            var httpClient = new HttpClient();

            try

            {

                await Task.WhenAll(SendRequests());

                Console.WriteLine("当前网络连接正常");

            }

            catch (Exception e)

            {

                Console.WriteLine("当前网络不正常，请检查网络连接");

            }

​

            IEnumerable<Task> SendRequests()

            {

                yield return Task.Run(() => httpClient.GetAsync("http://www.baidu.com"));

                yield return Task.Run(() => httpClient.GetAsync("http://www.bing.com"));

                yield return Task.Run(() => httpClient.GetAsync("http://www.taobao.com"));

            }

        }

    }

}