C# 使用線程狀態標識替代過時suspend和resumn方法

public partial class MainForm : Form
{
    public MainForm()
    {
        this.InitializeComponent();
    }

    private Thread m_thread = null;
    private ThreadState m_state = ThreadState.Unstarted;

    private void HandleTask()
    {
        this.m_state = ThreadState.Running;
        int i = 0;
        while (i < 100000)
        {
            //已經暫停
             if(this.m_state == ThreadState.Suspended)
                continue;
            //請求暫停
              if (this.m_state == ThreadState.SuspendRequested)
            {
                this.m_state = ThreadState.Suspended;
                continue;
            }

            //已經停止
             if (this.m_state == ThreadState.Stopped)
                break;
            //請求停止
             if (this.m_state == ThreadState.StopRequested)
            {
                this.m_state = ThreadState.Stopped;
                break;
            }

            //處理主要任務，這裏休息100ms是爲了模擬實際任務的執行時間
            Thread.Sleep(100);
            i = i + 1;
           
            //在界面上顯示信息
            this.Invoke(new ShowInfoHandler(this.ShowInfo), new object[] { i });
        }
        this.m_thread = null;
        this.m_state = ThreadState.Stopped;
    }

    public void Start()
    {
        if (this.m_thread == null)
        {
            this.m_thread = new Thread(new ThreadStart(this.HandleTask));
            this.m_thread.Start();
        }
        if (this.m_state == ThreadState.Suspended)
            this.m_state = ThreadState.Running;
    }

    public void Pause()
    {
        this.m_state = ThreadState.SuspendRequested;
        while (this.m_state != ThreadState.Suspended)
            Application.DoEvents();
    }

    public void Stop()
    {
        this.m_state = ThreadState.StopRequested;
        while (this.m_state != ThreadState.Stopped)
            Application.DoEvents();
    }

    private delegate void ShowInfoHandler(int value);
    private void ShowInfo(int value)
    {
        this.label1.Text = value.ToString();
    }

    private void btnRun_Click(object sender, EventArgs e)
    {
        this.Start();
    }

    private void btnPause_Click(object sender, EventArgs e)
    {
        this.Pause();
    }

    private void btnStop_Click(object sender, EventArgs e)
    {
        this.Stop();
    }
}