简述自己用过的几种异步调用方式

        private static void BeginInvoke1()
        {
            Func<int,string> fun = Todo;
            for (int i = 0; i < 5; i++)
            {
                //fun.BeginInvoke(i,TodoCallBack, fun);
                /*
                 异步调用委托BeginInvoke
                 * handler.EndInvoke(x)为执行委托的结果
                 */
                fun.BeginInvoke(i, x => {
                    Func<int, string> handler = x.AsyncState as Func<int, string>;
                    //str:为异步调用的返回值
                    string str=handler.EndInvoke(x);
                    Console.WriteLine(str);
                }, fun);
            }
        }

        private static void Test(object i)
        {
            Console.WriteLine(i.ToString());
        }

        private static void Thread1()
        {
            //可以传入一个object值，不能接收返回值
            System.Threading.Thread t = new System.Threading.Thread(Test);
            t.Start(10);
        }

private static void TaskFac()
        {
            //工厂属性的调用方式
            Task t = Task.Factory.StartNew(x => {
                Console.WriteLine("测试"+x);
            },"taskFac");
        }

        private static void TestTask()
        {
            //简单的调用方式
            Task t = new Task((x) => {
                Console.WriteLine("测试"+x);
            },"task");
            t.Start();
        }