在进度栏中闪烁文本？

Question

i have made a cool progressbar with text in the middle of it. Here is my code:

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

For some reason, the text shows up then disappears and other weird stuff. Why is that, and how do i fix it?

Answer 1

尝试将绘图代码移到Paint事件中，基本上是在修改控件的视觉效果，因此您需要处理它而不是默认的绘画行为。

Answer 2

Your drawing gets erased whenever the control is repainted.

Instead, you need to set a flag indicating whether to draw the text right now, then handle the Paint event, and, if the flag is true, draw the text.

In the timer tick handler, toggle the flag and call Invalidate() .

Answer 3

另一种方法是创建一个UserControll，并在进度条顶部使用标签，然后分别使用每个标签，这样做可能会更容易实现，几乎不需要任何其他代码。