c#方法转异步例子

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
 
namespace 亚信电子商务
{
 
    public class Program2
    {
 
        public static void Main(string[] args)
        {
 
            Console.WriteLine("主线程1");
 
            AsyncTest.ToAsync(()=> {
 
                Thread.Sleep(3000);
 
                Console.WriteLine("让我用新的线程执行吧，主线程你做你的事吧");
 
            }, () => { Console.WriteLine("回调"); });
 
            AsyncTest.ToAsync<string>(() => {
 
                Thread.Sleep(1000);
                return "女猪脚和男猪脚结婚了";
 
            }, p => { Console.WriteLine("回调结果："+ p); });
 
            Console.WriteLine("主线程2");
 
            Console.ReadLine();
        }
 
    }
 
    /// <summary>
    /// 将一个普通方法转为异步方法
    /// </summary>
    public class AsyncTest
    {
        /// <summary>
        /// 把一个普通无参，无返回值的方法转为异步方法
        /// </summary>
        /// <param name="srcAction">要转的方法</param>
        /// <param name="callBack">回调方法</param>
        public static async Task ToAsync(Action srcAction,Action callBack)
        {
            //定义一个异步无返回值的方法,下面写法可能有点绕
            Func<Task> task = () =>
            {
                return Task.Run(() =>
                {
                    srcAction();
 
                });
            };
            await task();
            if (callBack != null)
            {
                callBack();
            }
        }
 
        /// <summary>
        /// 把一个无参有返回值的方法转为异步方法
        /// </summary>
        /// <typeparam name="T">泛型模板类型</typeparam>
        /// <param name="srcFunc">被转的源方法</param>
        /// <param name="callBack">回调</param>
        public static async Task ToAsync<T>(Func<T> srcFunc, Action<T> callBack)
        {
 
            Func<Task<T>> task = () => {
                return Task<T>.Run(() => {
 
                    return srcFunc();
                });
            };
 
            var result = await task();
            if (callBack != null)
            {
                callBack(result);
            }
 
        }
 
    }
}