C# 多线程等待子线程结束 Task.Factory

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

private void button1_Click(object sender, EventArgs e)      {          List<Task> tasks = new List<Task>();          Task.Factory.StartNew(() =>          {                for (int i = 0; i < 10; i++)              {                  Task t = Task.Factory.StartNew((k) => { Call(k); }, i);                  tasks.Add(t);              }              if (tasks.Count == 0)              {                  throw new Exception("Task 队列未赋值");              }              Task.WaitAll(tasks.ToArray());              Console.WriteLine("this is main");          });             }

　　

　　

?

1 2 3 4 5 6

void Call(object a)      {          Thread.Sleep(1000);          Console.WriteLine(a);        }

　　测试结果