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HomeBackend DevelopmentC#.Net TutorialC# asynchronous method execution code

using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using System.Threading;  
using System.Runtime.Remoting.Messaging;  
    
namespace ConsoleApplication1  
{  
    public delegate int AddHandler(int a, int b);  
    public class AddMethod  
    {  
        public static int Add(int a, int b)  
        {  
            Console.WriteLine("开始计算:" + a + "+" + b);  
            Thread.Sleep(3000); //模拟该方法运行三秒  
            Console.WriteLine("计算完成!");  
            return a + b;  
        }  
    }  
        
            
    //**************同步调用***********  
    //委托的Invoke方法用来进行同步调用。同步调用也可以叫阻塞调用,它将阻塞当前线程,然后执行调用,调用完毕后再继续向下进行。  
    
    //**************异步调用***********  
    //异步调用不阻塞线程,而是把调用塞到线程池中,程序主线程或UI线程可以继续执行。  
    //委托的异步调用通过BeginInvoke和EndInvoke来实现。  
    
    //**************异步回调***********  
    //用回调函数,当调用结束时会自动调用回调函数,解决了为等待调用结果,而让线程依旧被阻塞的局面。  
    
    //注意: BeginInvoke和EndInvoke必须成对调用.即使不需要返回值,但EndInvoke还是必须调用,否则可能会造成内存泄漏。  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            Console.WriteLine("===== 同步调用 SyncInvokeTest =====");  
            AddHandler handler = new AddHandler(AddMethod.Add);  
            int result=handler.Invoke(1,2);  
            Console.WriteLine("继续做别的事情。。。");  
    
            Console.WriteLine(result);  
            Console.ReadKey();  
    
    
            Console.WriteLine("===== 异步调用 AsyncInvokeTest =====");  
            AddHandler handler1 = new AddHandler(AddMethod.Add);  
            IAsyncResult result1=handler1.BeginInvoke(1,2,null,null);  
            Console.WriteLine("继续做别的事情。。。");  
    
            //异步操作返回  
            Console.WriteLine(handler1.EndInvoke(result1));  
            Console.ReadKey();  
    
            Console.WriteLine("===== 异步回调 AsyncInvokeTest =====");  
            AddHandler handler2 = new AddHandler(AddMethod.Add);  
            IAsyncResult result2 = handler2.BeginInvoke(1, 2, new AsyncCallback(Callback), null);  
            Console.WriteLine("继续做别的事情。。。");  
            Console.ReadKey();  
    
    
            //异步委托,也可以参考如下写法:  
            //Action<object> action=(obj)=>method(obj);  
            //action.BeginInvoke(obj,ar=>action.EndInvoke(ar),null);  
            //简简单单两句话就可以完成一部操作。  
        }  
        static void Callback(IAsyncResult result)  
        {  
            AddHandler handler = (AddHandler)((AsyncResult)result).AsyncDelegate;  
            Console.WriteLine(handler.EndInvoke(result));  
        }  
    }  
}

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