多線程回調傳值例子|C#多線程回調傳值例子

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
{

    //聲明一個回呼函數：注意傳遞的參數要與Example類中的函數參數類型一致
    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);
            }
         
        }
    }
}