【NET多线程】C#多线程异步请求多个url地址

异步测试代码

            System.Diagnostics.Debug.Print("start");
            new Thread(new ThreadStart(new Action(() =>
            {
                for (int i = 0; i < 10; i++)
                {
                    System.Diagnostics.Debug.Print(i + "
");
                }

                System.Diagnostics.Debug.Print("Thread over");
            }))).Start();
            System.Diagnostics.Debug.Print("Main over");

输出

"start"
"Main over"
"0
"
"1
"
"2
"
"3
"
"4
"
"5
"
"6
"
"7
"
"8
"
"9
"
"Thread over"

效果是主线程已经结束了，子线程才开始

　　　　　　　var url = "http://h5.ktgj.com/";

            var list_task = new List<Task<string>>();
            for (int i = 0; i < 10; i++)
            {
                var temp_url = url + i;
                var task = Task.Run(async () =>
                {
                    System.Diagnostics.Debug.Print("temp_url=" + temp_url);
                    var client = new System.Net.Http.HttpClient();
                    var html = await client.GetStringAsync(temp_url);
                    System.Diagnostics.Debug.Print("temp_url=" + temp_url + " is ok");
                    return html;
                });

                list_task.Add(task);
            }

            Task.WaitAll(list_task.ToArray());

            foreach (var item in list_task)
            {
                System.Diagnostics.Debug.Print(item.Result);
            }

Task.WaitAll()

等所有请求都返回了html，才开始后续处理

            //await Task.WhenAll(task1, task2, task3);

            //ThreadPool.QueueUserWorkItem(_ =>
            //{
            //    Thread.Sleep(1000);
            //    Thread.Sleep(10); System.Diagnostics.Debug.Print("ThreadPool.QueueUserWorkItem");
            //});

            ////不使用await：Task多线程
            //Task.Run(() =>
            //{
            //    Thread.Sleep(1000);
            //    Thread.Sleep(10); System.Diagnostics.Debug.Print("Task.Run");
            //});