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

2.多線程執行後，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);
    }
});