C#--async-await的用法

NET 中的 async/await 异步编程

MSDN上的文章

**async与await最佳实践

需要先理解thread的用法，再掌握task的用法，才能力理解async和await的用法

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

namespace TestApp
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("-------主线程启动-------");
            Task<int> task = GetLengthAsync();
            Console.WriteLine("Main方法做其他事情");
            Console.WriteLine("Task返回的值" + task.Result);
            Console.WriteLine("-------主线程结束-------");
        }

        static Task<int> GetLengthAsync()
        {
            Console.WriteLine("GetLengthAsync Start");
            Task<int> task = Task<int>.Run(() => { string str = GetStringAsync().Result;
                Console.WriteLine("GetLengthAsync End");
                return str.Length; });
            return task;
        }

        static Task<string> GetStringAsync()
        {
            return Task<string>.Run(() => { Thread.Sleep(2000); return "finished"; });
        }
    }
}