Async异步编程入门示例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AsyncDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("异步方法测试开始！");//标记时间戳开始
            AsyncMethod(0);//调用异步方法
            Console.WriteLine("异步方法结束");//标记时间戳结束
            Console.ReadKey();
        }

        //异步操作
        private static async void AsyncMethod(int input)
        {
            Console.WriteLine("进入异步操作！");
            var result = await AsyncWork(input);
            Console.WriteLine("最终结果{0}", result);
            Console.WriteLine("退出异步操作");
        }

        private static async Task<int> AsyncWork(int val)
        {
            for (int i = 0; i < 5; i++)
            {
                Console.WriteLine("耗时操作{0}", i);
                await Task.Delay(1000);
                val++;
            }
            return val;
        }
    }
}

 输出：