AsyncCallback 異步回調委託

AsyncCallback異步

意義:async

異步操做完成時調用的方法spa

語法1:code

構造異步回調對象對象

AsyncCallback 異步回調對象名asyncCallback = new AsyncCallback(異步操做完成時調用的方法MyAsyncCallback);blog

 

語法2:string

定義委託,並進行異步調用,異步調用完成後自動觸發it

委託類型Action fn委託名 = Run委託定義;
委託名fn.BeginInvoke(異步回調對象名asyncCallback );io

 

示例:class

using System;

namespace Examples.AdvancedProgramming.AsynchronousOperations
{
    public class UseDelegateForAsyncCallback
    {
        delegate string MethodDelegate(int iCallTime);
        public static void Main()
        {
            MethodDelegate dlgt = (m)=> 
            {
                return "你輸入的數字是"+m;
            };
            AsyncCallback asyncCallback = new AsyncCallback(MyAsyncCallback);           
            Action fn = Run;
            fn.BeginInvoke(asyncCallback,null);

        }

        private static void MyAsyncCallback(IAsyncResult ar)
        {
            Console.WriteLine("異步調用");
            Console.ReadLine();
        }


        public static void Run()
        {

        }
    }
}
///  控制檯輸出結果:
///     你輸入的數字是:5
///     異步調用
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