c# - ProgressBar 绘制方法？

Question

好的，这是我在进度条上绘制的代码:

private void timer2_Tick(object sender, EventArgs e)
    {
        int percent = progressBar1.Value;
        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));
        progressBar1.Increment(+1);
        if (progressBar1.Value >= 99)
        {
            timer2.Stop();
            this.Close();
        }

好的，所以我在中间画了一个标签来显示进度条的值。出于某种原因，它一直在闪烁……消失又出现。所以，有人告诉我取出那段代码并将其放入 paint 方法中......我没有看到它。有没有更简单的方法？

Answer 1

这是一个应该有效的代码(我选择了选项 3，创建一个子类并覆盖 WndProc 来处理绘制消息:

public class Prog : ProgressBar
{
    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);

        if (m.Msg == 0x000F)
        {
            var flags = TextFormatFlags.VerticalCenter |
                        TextFormatFlags.HorizontalCenter |
                        TextFormatFlags.SingleLine |
                        TextFormatFlags.WordEllipsis;

            TextRenderer.DrawText(CreateGraphics(),
                                  ((float)this.Value/this.Maximum*100) + "%",
                                  Font,
                                  new Rectangle(0, 0, this.Width, this.Height),
                                  Color.Black,
                                  flags);
        }
    }
}