Winform 實現進度條彈窗和任務控制

/// <summary>
/// 執行操作事件
/// </summary>
public event Action OperateAction;

/// <summary>
/// 終止操作事件
/// </summary>
public event Action AbortAction;

/// <summary>
/// 中止按鈕點擊事件
/// </summary>
private void btn_Abort_Click(object sender, EventArgs e)
{
  AbortAction?.Invoke();
  DialogResult = DialogResult.Abort;
  //Close(); //不需要手動關閉;
}

/// <summary>
/// 窗體載入事件
/// </summary>
private void FormProgressDialog_Load(object sender, EventArgs e)
{
  Task.Factory.StartNew(() =>
  {
    OperateAction?.Invoke();
    DialogResult = DialogResult.OK;
  });
}

/// <summary>
/// 設置顯示信息(值為null時保持不變)
/// </summary>
/// <param name="rtfTitleContent">富文本格式的標題內容</param>
/// <param name="totalMessage">總體消息</param>
/// <param name="currentMessage">當前消息</param>
public void SetInfo(string rtfTitleContent = null, string totalMessage = null, string currentMessage = null)
{
  if (rtfTitleContent != null) rtb_Title.Rtf = rtfTitleContent;
  if (totalMessage != null) lbl_Total.Text = totalMessage;
  if (currentMessage != null) lbl_Current.Text = currentMessage;
}

/// <summary>
/// 設置進度
/// </summary>
/// <param name="currentValue">當前數值</param>
/// <param name="totalValue">總數值</param>
public void SetProsess(double currentValue, double totalValue)
{
  try
  {
    progressBar.Value = (int)(currentValue / totalValue * 100);
  }
  catch (Exception ex)
  {
    Console.WriteLine(ex);
  }
}

#region 測試任務進度條彈窗

private CancellationTokenSource _Cts; //任務取消令牌;
private AutoResetEvent _AutoResetEvent = new AutoResetEvent(false);//參數傳 false，則 WaitOne 時阻塞等待;

/// <summary>
/// 測試任務進度彈窗
/// </summary>
private void BtnProgressDialog_Click(object sender, EventArgs e)
{
  _AutoResetEvent.Reset();
  string businessName = "業務1";

  FormProgressDialog progressWindow = new FormProgressDialog()
  {
    Text = "任務處理窗口",
  };

  progressWindow.SetColorfulTitle("業務1 ", Color.DarkOrange, true);
  progressWindow.SetColorfulTitle("正在執行中......", Color.Black);
  progressWindow.SetInfo(null, "", "");

  List<string> orders = new List<string>(){"訂單1", "訂單2", "訂單3", "訂單4", "訂單5" }; //業務數據;
  List<string> leftList = orders.Select(x => x).ToList(); //剩餘（未處理）數據;
  int successCount = 0; //成功數量;

  _Cts = new CancellationTokenSource();

  //註冊一個將在取消此 CancellationToken 時調用的委托;
  _Cts.Token.Register(async () =>
  {
    ShowInfo("操作終止");
    
    await Task.Run(() =>
    {
      _AutoResetEvent.WaitOne(1000 * 5); //等待有可能還在執行的業務方法;

      if (successCount < orders.Count)
      {
        ShowInfo($"{businessName} 有 {orders.Count - successCount} 項任務被終止，可在消息框中查看具體項。");

        foreach (var leftName in leftList)
        {
          ShowInfo($"【{businessName}】的【{leftName}】執行失敗，失敗原因：【手動終止】。");
        }
      }
    });
    
  });

  progressWindow.OperateAction += () =>
  {
    Task task = new Task(() =>
    {
      foreach (var order in orders)
      {
        //判斷是否被取消;
        if (_Cts.Token.IsCancellationRequested)
        {
          break;
        }

        progressWindow.TryBeginInvoke(new Action(() =>
        {
          progressWindow.SetInfo(null, $"共{orders.Count}項，已執行{successCount}項", $"當前正在執行：{order}");
        }));

        if (BusinessMethod(order, businessName))
        {
          successCount++;
          leftList.RemoveAll(x => x == order);

          if (_Cts.Token.IsCancellationRequested)
          {
            _AutoResetEvent.Set(); //放行 Register 委托處的等待;
          }
        }

        progressWindow.TryBeginInvoke(new Action(() =>
        {
          progressWindow.SetProsess(orders.IndexOf(order) + 1, orders.Count);
        }));
      }
    }, _Cts.Token);

    task.Start();
    task.Wait();
  };

  progressWindow.AbortAction += () =>
  {
    _Cts.Cancel();
  };

  var result = progressWindow.ShowDialog();
  int leftCount = orders.Count - successCount;
  if (result == DialogResult.OK || leftCount <= 0)
  {
    ShowInfo($"{businessName} 整體完成。");
  }
  else if (result == DialogResult.Abort)
  {
    //移到 _Cts.Token.Register 處一起判斷，不然數目可能不準;
    //ShowInfo($"{businessName} 有 {leftCount} 項任務被終止，可在消息框中查看具體項。");
  }
}

/// <summary>
/// 業務處理方法
/// </summary>
private bool BusinessMethod(string order, string businessName)
{
  string errStr = $"【{businessName}】的 {order} 任務失敗，失敗原因：";

  //測試
  Thread.Sleep(1000 * 2);

  try
  {
    //業務方法;

    ShowInfo($"【{businessName}】的 {order} 任務執行成功。");
    return true;
  }
  catch (Exception ex)
  {
    ShowInfo($"{errStr}{ex.Message}");
  }

  return false;
}

#endregion