線程介紹

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            timer1.Enabled = true;
            ThreadStart childref = new ThreadStart(CallToChildThread);
            Thread childThread = new Thread(childref);
            childThread.Start();
        }
        public void CallToChildThread()
        {
            while (true)
            {
                Console.WriteLine("子線程開始");
                // 線程暫停 3000 毫秒
                int sleepfor = 1000;
                Console.WriteLine("子線程等待 {0} 秒", sleepfor / 1000);
                Thread.Sleep(sleepfor);
                SetText("我是子線程：" + DateTime.Now.ToString());
            }
        }
        private delegate void SetTextCallback(string text);

        /// <summary>
        /// 給label賦值
        /// </summary>
        /// <param name="text"></param>
        private void SetText(string text)
        {
            // InvokeRequired須要比較調用線程ID和建立線程ID
            // 若是它們不相同則返回true
            if (this.label1.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetText);
                this.Invoke(d, new object[] { text });
            }
            else
            {
                this.label1.Text = text;
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
             if (progressBar1.Value<progressBar1.Maximum)
            {
                progressBar1.Value++;
            }
            else
            {
                
                timer1.Enabled = false;
            }
        }
    }
}