进度条工具

public partial class ProgressForm : Form
    {
        private BackgroundWorker worker = null;

        public ProgressForm(BackgroundWorker backgroundWorker)
        {
            worker = backgroundWorker;
            InitializeComponent();
        }
        
        public void OnProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar.Value = e.ProgressPercentage;
        }
        public void OnProcessCompleted(object sender, EventArgs e)
        {
            this.Close();            
        }
        protected override void OnClosed(EventArgs e)
        {
            base.OnClosed(e);
            if (worker.IsBusy)
                worker.CancelAsync();
        }
        private void buttonCancel_Click(object sender, EventArgs e)
        {
            Close();
            if (worker.IsBusy)
                worker.CancelAsync();
        }
    }
}

使用带 backgroundWorker 的构造函数