异步多线程案例

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class Program     {         static void Main(string[] args)         {            Console.WriteLine($"Task 学习开始----{Thread.CurrentThread.ManagedThreadId}");             List<Task> ta1 = new List<Task>();             fun1(out ta1);//得到一个异步多线程集合             TaskFactory tf = new TaskFactory();//现场工厂 管理线程             //等集合中的线程执行完，在从线程池中拿一个线程执行新方法             tf.ContinueWhenAll(ta1.ToArray(), t => {Console.WriteLine($"Task 学习结束----{Thread.CurrentThread.ManagedThreadId}"); });         }         public static void fun1(out List<Task> tlist)         {             List<Task> tasklist = new List<Task>();             //lamdba表达式直接写方法体             tasklist.Add(Task.Run(() => {Console.WriteLine($"======学习第1个线程======{Thread.CurrentThread.ManagedThreadId}"); }));             tasklist.Add(Task.Run(() => {Console.WriteLine($"======学习第2个线程======{Thread.CurrentThread.ManagedThreadId}"); }));             tasklist.Add(Task.Run(() => {Console.WriteLine($"======学习第3个线程======{Thread.CurrentThread.ManagedThreadId}"); }));             tasklist.Add(Task.Run(() =>             {                 var result = fun2("hello!"); //调用有参数和返回值的方法                Console.WriteLine(result.ToString());             }));             tlist = tasklist;//返回值         }         //有参数的方法         public static string fun2(string a)         {            Console.WriteLine(a+"调用有参数返回值的方法!"+ Thread.CurrentThread.ManagedThreadId);             return a;         }     }