確認Thread.Sleep(500)的對多線程的影響范圍

本文通过实验验证了Thread.Sleep方法的作用范围仅限于调用它的线程。实验使用三个线程分别设置不同的睡眠时间，并通过进度条显示各线程的状态。

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目的：確認Thread.Sleep(500)的影響范圍

構想：使用3個progressBar&3個線程，分別在線程內執行Thread.Sleep(500)&Thread.Sleep(1000)&Thread.Sleep(2000)，查看progressBar狀態，反映出時間sleep的狀況

結果：雖然很傻，不過最終還是確認到現象，thread.sleep的影響范圍是執行thread.sleep的所在線程（雖然此前在优快云的論壇中已經獲得答案，不過證實一下心里踏實）

源碼：

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

namespace TEST
{
    public delegate void _Delegate_T(); 

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

        _Delegate_T _DT_T1 = null;
        _Delegate_T _DT_T2 = null;
        _Delegate_T _DT_T3 = null;
        Thread T1 = null;
        Thread T2 = null;
        Thread T3 = null;

        private void button1_Click(object sender, EventArgs e)
        {
            T1 = new Thread(p1);
            T2 = new Thread(p2);
            T3 = new Thread(p3);

            _DT_T1 = new _Delegate_T(_DT_T_M1);
            _DT_T2= new _Delegate_T(_DT_T_M2);
            _DT_T3 = new _Delegate_T(_DT_T_M3);

            T1.IsBackground = true;
            T1.Start();

            T2.IsBackground = true;
            T2.Start();

            T3.IsBackground = true;
            T3.Start();
        }

        public void _DT_T_M1()
        {
            if (progressBar1.InvokeRequired)
            {
                progressBar1.Invoke(_DT_T1);
            }
            else
            {
                progressBar1.Increment(1);
                if (progressBar1.Value == progressBar1.Maximum)
                    progressBar1.Value = 0;
            }
        }
        public void _DT_T_M2()
        {
            if (progressBar2.InvokeRequired)
            {
                progressBar2.Invoke(_DT_T2);
            }
            else
            {
                progressBar2.Increment(1);
                if (progressBar2.Value == progressBar2.Maximum)
                    progressBar2.Value = 0;
            }
        }
        public void _DT_T_M3()
        {
            if (progressBar3.InvokeRequired)
            {
                progressBar3.Invoke(_DT_T3);
            }
            else
            {
                progressBar3.Increment(1);
                if (progressBar3.Value == progressBar3.Maximum)
                    progressBar3.Value = 0;
            }
        }

        public void p1()
        {
            while (this.T1.IsAlive)
            {
                Thread.Sleep(500);
                _DT_T1();
            }
        }
        public void p2()
        {
            while (this.T2.IsAlive)
            {
                Thread.Sleep(1000);
                _DT_T2();
            }
        }
        public void p3()
        {
            while (this.T3.IsAlive)
            {
                Thread.Sleep(2000);
                _DT_T3();
            }
        }
    }
}