C#（同步调用、异步调用、异步回调）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Remoting.Messaging;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace ThreadCallback
{
    class Program
    {

        public delegate int AddHandler(int a, int b, int c);

        public class AddClass
        {
            public static int Add(int a, int b, int c)
            {
                Console.WriteLine("\n开始计算：" + a + "+" + b + "+"+c);
                Thread.Sleep(3000); //模拟该方法运行三秒
                Console.WriteLine("计算完成！");
                return a + b + c;
            }
        }

        /// <summary>
        /// 同步调用
        /// </summary>
        public class SynchronousCall
        {
            static void Main_S()
            {
                Console.WriteLine("===== 同步调用 SyncInvokeTest =====");
                AddHandler handler = new AddHandler(AddClass.Add);
                int result = handler.Invoke(1, 2, 3);

                Console.WriteLine("继续做别的事情。。。");

                Console.WriteLine(result);
                Console.ReadKey();
            }

        }

        /// <summary>
        /// 异步调用
        /// </summary>
        public class AsynchronousCall
        {
            static void Main_S()
            {
                Console.WriteLine("===== 异步调用 AsyncInvokeTest =====");
                AddHandler handler = new AddHandler(AddClass.Add);

                //IAsyncResult: 异步操作接口(interface)
                //BeginInvoke: 委托(delegate)的一个异步方法的开始
                IAsyncResult result = handler.BeginInvoke(1, 2,3, null, null);
                Console.WriteLine("------继续做别的事情。。。\n");

                //异步操作返回
                Console.WriteLine(handler.EndInvoke(result));
                Console.ReadKey();
            }

        }


        static void Main(string[] args)
        {

            Console.WriteLine("===== 异步回调 AsyncInvokeTest =====");
            AddHandler handler = new AddHandler(AddClass.Add);

            //异步操作接口(注意BeginInvoke方法的不同！)
            IAsyncResult result = handler.BeginInvoke(1, 2,3, new AsyncCallback(CallbackFunc), "AsycState:OK");

            Console.WriteLine("------继续做别的事情。。。--------");
            Console.ReadKey();

        }

        static void CallbackFunc(IAsyncResult result)
        {
            //result 是“加法类.Add()方法”的返回值             
            //AsyncResult 是IAsyncResult接口的一个实现类，引用空间：System.Runtime.Remoting.Messaging             
            //AsyncDelegate 属性可以强制转换为用户定义的委托的实际类。
            AddHandler handler = (AddHandler)((AsyncResult)result).AsyncDelegate;
            Console.WriteLine(handler.EndInvoke(result));
            Console.WriteLine(result.AsyncState);
        }  

    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System;
using System.Threading;
namespace DataImportFromAccess
{


    //声明一个回调函数：注意传递的参数要与Example类中的函数参数类型一致
    public delegate void ExampleCallback(int lineCount, Label lb);
    public class Form1{
        public Form1()
        {
            InitializeComponent();
        }

        public void CurrentNumber(int tempCurrent,Label lb)
        {
            lb.Text = tempCurrent.ToString();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            ThreadWithData twd = new ThreadWithData(1, 100,this.label1,new ExampleCallback(CurrentNumber));
            Thread td = new Thread(new ThreadStart(twd.RunMethod));
            td.Start();
        }   
        private void button2_Click(object sender, EventArgs e)
        {
            ThreadWithData twd = new ThreadWithData(2, 200,this.label2, new ExampleCallback(CurrentNumber));
            Thread td = new Thread(new ThreadStart(twd.RunMethod));
            td.Start();
        }
    }
    public class ThreadWithData
    {
        private int start = 0;
        private int end = 0;
        private ExampleCallback callBack;
        private Label lb;

        public ThreadWithData(int start,int end,Label lb,ExampleCallback callBack)
        {
            this.start = start;
            this.end = end;
            this.callBack=callBack;
            this.lb = lb;
        }
        public void RunMethod()
        {
            for(int i=start;i<end;i++)
            {
                Thread.Sleep(1000);
                if (callBack != null)
                    callBack(i,lb);
            }
         
        }
    }
}