老版本的写法经常是以BeginXXX, EndXXX, 或者xx.xxxAsycn(........)
新的支持 async异步关键字配合Task可读性和易用性比老板好多了。
新旧例子：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Globalization;
using System.Net.Http.Headers;
namespace ConsoleApp2
{
class Program
{
static void Main(string[] args)
{
TestClass class1 = new TestClass();
class1.TestOldAsycn();
class1.TestNewAsycn();
Console.ReadLine();
}
}
public class TestClass
{
private delegate long AddDel(int i, int j);
public void TestOldAsycn()
{
AddDel del = Add;
IAsyncResult ar = del.BeginInvoke(2, 3, MyCallBack, del);//参数里面的del 是用于残敌给回调函数调用，参看回调函数方法里的代码： ar.AsyncState as AddDel;
//var result del.EndInvoke(ar);//获取结果，会阻塞线程
Console.WriteLine("Main contine .......");
}
private long Add(int i, int j)
{
Console.WriteLine("begin wait 5 sec---------------");
System.Threading.Thread.Sleep(5000);
return i + j;
}
/// <summary>
/// callback 获得结果回到函数，beginXXX..里的任务执行完成后才会调用这个
/// </summary>
/// <param name="ar"></param>
private void MyCallBack(IAsyncResult ar)
{
var d = ar.AsyncState as AddDel;//ar.AsyncState 是bingXXX里的Object
var result = (d.EndInvoke(ar));//执行EndXXX获得结果
Console.WriteLine("result:" + result);
}
//--------------新的.net更方便的Task/Asyc/Await语法----------------------------------------
public async Task TestNewAsycn()
{
var result = await AddNew(2, 3); // OR AddNew(2,3);
Console.WriteLine("new asycn result:" + result);
}
private async Task<long> AddNew(int i, int j)
{
Console.WriteLine("begin wait 5 sec---------------");
System.Threading.Thread.Sleep(5000);
return await Task.FromResult(i + j);
}
}
}