Question

我正在我的Windows应用程序中实现进度条控件。这是我的进度条形码的样子。

public partial class ProgressBar : UserControl
{
    public event Action OnCommand;

    private int _progressInitial = 0;

    private int _progressMaximum = 100;
    #region :: Member Methods ::
    //------------------------------------------------------------------------------
    public void Start()
    {
        _timer.Start();
        _progressBar.Value = 0;

        if (!_backWorker.IsBusy)
        {
            _lblProgressText.Text = string.Empty;
            _backWorker.RunWorkerAsync();
        }
    }
    //------------------------------------------------------------------------------
    public void End()
    {
        if (_backWorker.WorkerSupportsCancellation)
        {
            _timer.Stop();
            _backWorker.CancelAsync();
        }
    }
    //------------------------------------------------------------------------------
    #endregion

    public ProgressBar()
    {
        InitializeComponent();
        _progressBar.Maximum = _progressMaximum;
        _backWorker.WorkerSupportsCancellation = true;
        _backWorker.WorkerReportsProgress = true;
    }
    //------------------------------------------------------------------------------
    private void _backWorker_DoWork(object sender, DoWorkEventArgs e)
    {
        if (this.OnCommand != null)
            this.Invoke((Action)(() => OnCommand()));
        if (_backWorker.CancellationPending)
            e.Cancel = true;
    }
    //------------------------------------------------------------------------------
    private void _backWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        _lblProgressText.Text = string.Format("{0}%", e.ProgressPercentage);
            _progressBar.Value = e.ProgressPercentage;
    }
    //------------------------------------------------------------------------------
    private void _backWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        _progressBar.Value = _progressMaximum;
        _lblProgressText.Text = string.Format("{0}%", _progressMaximum);
        _timer.Stop();
        _timer.Enabled = false;
    }
    //------------------------------------------------------------------------------
    private void _timer_Tick(object sender, EventArgs e)
    {
        if (_backWorker.IsBusy)
        {
            _progressInitial += 10;
            if (_progressInitial >= _progressMaximum)
                _progressInitial = 99;
            _backWorker.ReportProgress(_progressInitial);
        }
    }
    //------------------------------------------------------------------------------
}

Parent UserControl

public partial class Sample : UserControl
{
    public Sample()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        progressBar1.Start();
    }

    private void button2_Click(object sender, EventArgs e)
    {
        progressBar1.End();
    }

    private void progressBar1_Command()
    {
        System.Threading.Thread.Sleep(5000);
    }
}

这是UserControl，在我的DoWork后台工作程序中，我对父控件执行长数据库操作，该操作会触发OnCommand事件操作。

这个OnCommand处理程序将包含长数据库操作，这就是我使用计时器更新进度条一定时间间隔的原因。

如果我直接在Form

上使用控件，这可以正常工作

但是如果我在usercontrol包含的另一个UserControl中使用此控件

开始和结束按钮
实施了OnCommand事件的ProgressBar控件（数据库操作）

OnCommand方法执行的那一刻，计时器停止滴答。

为什么它适用于表单而不是UserControl？

提前致谢

此致 Francis P。

进度条用户控件在另一个UserControl内部不会触发Click事件

Parent UserControl

0 个答案: