c# - 进度条值只是闪烁并消失

Question

我试图将百分比值放入我的进度条中，但它看起来像闪烁然后消失了。

这是我的 ProgressChanged 事件:

C#代码

public void button1_click(object sender, EventArgs e)
{
BackgroundWorker _worker = new BackgroundWorker();
                _worker.WorkerReportsProgress = true;
                _worker.ProgressChanged += new ProgressChangedEventHandler(_worker_ProgressChanged);
                _worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(_worker_RunWorkerCompleted);                
                _worker.DoWork += (s, e2) =>
                {
                    for (int i = 0; i <= xmlnode.Count - 1; i++)
                    {
                         _worker.ReportProgress((int)100 * i / (xmlnode.Count - 1));
                         // Many validations here
                    }
                 }
}

void _worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {            
            progressBar1.Value = e.ProgressPercentage;            

             // Here I tryied to put the percentage value in progress bar

            int percent = (int)(((double)progressBar1.Value / (double)progressBar1.Maximum) * 100);
            progressBar1.CreateGraphics().DrawString(percent.ToString() + "%", new Font("Arial", (float)8.25, FontStyle.Regular), Brushes.Black, new PointF(progressBar1.Width / 2 - 10, progressBar1.Height / 2 - 7));
        }

Answer 1

文本只是闪烁，因为它没有在 Paint 上重新绘制。使用进度条的 Paint 事件并在那里绘制百分比。您只需将其存储在类变量中即可轻松获取该百分比。