BeginInvoke & EndInvoke Example

最新推荐文章于 2022-07-20 14:29:35 发布

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本文深入探讨了使用C#进行异步编程的多种方法，包括回调模式、等待完成和轮询方式，展示了如何通过BeginInvoke和EndInvoke实现异步调用，并在主线程中处理结果。

using System;
using System.Runtime.Remoting.Messaging;
using System.Threading;


//回调模式

delegate long MyDel(int first, int second);

class Program
{
    static long Sum(int x, int y)
    {
        Console.WriteLine("                         Inside Sum");

        Thread.Sleep(1111);

        return x + y;
    }

    static void CallWhenDone(IAsyncResult iar)
    {
        Console.WriteLine("                        Inside CallWhenDone");

        AsyncResult ar = (AsyncResult)iar;

        MyDel del = (MyDel)ar.AsyncDelegate;

        long result = del.EndInvoke(iar);

        Console.WriteLine($"End of the Invoke  {result}");



    }

    static void Main()
    {

        MyDel del = new MyDel(Sum);

        Console.WriteLine("Before BeginInvoke");

        IAsyncResult iar = del.BeginInvoke(222, 3, new AsyncCallback(CallWhenDone), null);

        Console.WriteLine("Doing more Work in Main");

        Thread.Sleep(1121);

        Console.WriteLine("Done with Main");

        Console.Read();


    }

}









using System;
using System.Threading;


//wait until done
delegate long MyDel(int first, int second);


class Program
{
    static long Sum(int x, int y)
    {
        Console.WriteLine("                 Inside Sum.");
        Thread.Sleep(199);

        return x + y;
    }


    static void Main()
    {
        MyDel myDel = new MyDel(Sum);

        Console.WriteLine("Before BeginInvoked");
        IAsyncResult asyncResult = myDel.BeginInvoke(11, 111, null, null);

        Console.WriteLine("End BeginInvoked");

        Console.WriteLine("Doing Stuff");


        long result = myDel.EndInvoke(asyncResult);

        Console.WriteLine(
        $"After EndInvoked...{result}");

        Console.Read();

    }


}



using System;
using System.Threading;


namespace ConsoleApp1
{

    //轮询方式

    delegate long MyDel(int first, int second);

    class Program
    {
        static long Sum(int x, int y)
        {
            Console.WriteLine("                Inside Sum");
            Thread.Sleep(1000);

            return x + y;
        }


        static void Main(string[] args)
        {
            MyDel myDel = new MyDel(Sum);

            IAsyncResult asyncResult = myDel.BeginInvoke(222, 222, null, null);


            Console.WriteLine("After BeginInvoke");

            while (!asyncResult.IsCompleted)
            {
                Console.WriteLine("Not  Dobe");

                for (long i = 0; i < 100000; i++)
                {
                    ;
                    }


            }


            Console.WriteLine("Done");

            long result = myDel.EndInvoke(asyncResult);

            Console.WriteLine($"The Result is -----{result}");

            Console.Read();

        }
    }
}