C#异步中的Task,async,await

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("我是主线程，线程ID：{0}", Thread.CurrentThread.ManagedThreadId);
            TestAsync();
            Console.ReadLine();
        }

        static async void  TestAsync()
        {
            Console.WriteLine("调用GetReturnResult()之前，线程ID：{0}。当前时间：{1}", Thread.CurrentThread.ManagedThreadId, DateTime.Now.ToString("yyyy-MM-dd hh:MM:ss"));
            var name = GetReturnResult();
            Console.WriteLine("调用GetReturnResult()之后，线程ID：{0}。当前时间：{1}", Thread.CurrentThread.ManagedThreadId, DateTime.Now.ToString("yyyy-MM-dd hh:MM:ss"));

            //异步回调内容
            //在await以及之后的代码都会阻塞
            Console.WriteLine("得到GetReturnResult()方法的结果：{0}。当前时间：{1}", await name, DateTime.Now.ToString("yyyy-MM-dd hh:MM:ss"));
            Console.WriteLine("await之后的内容。当前时间：{0}",  DateTime.Now.ToString("yyyy-MM-dd hh:MM:ss"));
            //异步回调内容
        }

        static async Task<string> GetReturnResult()
        {
            Console.WriteLine("执行Task.Run之前, 线程ID：{0}", Thread.CurrentThread.ManagedThreadId);
            return await Task.Run(() =>
            {
                Thread.Sleep(5000);
                Console.WriteLine("GetReturnResult()方法里面线程ID: {0}", Thread.CurrentThread.ManagedThreadId);
                return "我是返回值";
            });
        }

    }