c# 關於Task類處理多線程的學習

1.定義一個線程

 var task1 = Task.Factory.StartNew(() => DoSomeWork())；

方法如下：

        private static object DoSomeWork()
        {
            Console.WriteLine("nihao ");
            System.Threading.Thread.Sleep(3000);
            Console.Write("nihao ");
            return "xiexie";
        }

2.多線程執行后，執行另一個方法

  var task1 = Task.Factory.StartNew(() => DoSomeWork()).ContinueWith(
                 task => { Console.WriteLine(task.Result.ToString()); }).ContinueWith(
                 task => { Console.WriteLine(task.Result.ToString()); });

3.等待所有線程結束

var task1 = Task.Factory.StartNew(() => DoSomeWork());

var task2 = Task.Factory.StartNew(() => DoSomeWork());

var task3 = Task.Factory.StartNew(() => DoSomeWork());

Task.WaitAll(task1, task2, task3);

4.等待其中一個線程結束

var task1 = Task.Factory.StartNew(() => DoSomeWork());

var task2 = Task.Factory.StartNew(() => DoSomeWork());

var task3 = Task.Factory.StartNew(() => DoSomeWork());

Task.WaitAny(task1, task2, task3);

5.等待所有線程結束執行的方法

var task1 = Task.Factory.StartNew(() =>

{

    Thread.Sleep(3000);

    return "dummy value 1";

});

 

var task2 = Task.Factory.StartNew(() =>

{

    Thread.Sleep(3000);

    return "dummy value 2";

});

 

var task3 = Task.Factory.StartNew(() =>

{

    Thread.Sleep(3000);

    return "dummy value 3";

});

 

Task.Factory.ContinueWhenAll(new[] { task1, task2, task3 }, tasks =>

{

    foreach (Task<string> task in tasks)

    {

        Console.WriteLine(task.Result);

    }

});