Question

private void NewsUpdate()
        {
            counter += 1;
            progressBar1.Value = counter;
            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.Refresh();
            label9.Text = counter.ToString();
            label9.Visible = true;
            if (counter == 10)
            {
                Extractions();
                counter = 0;
            }
        }

这样我就可以看到progressBar1中间的百分比，但它会闪烁。我试图添加progressBar1.Refresh（）;在绘图之前和之后尝试使progressBar1无效，但没有任何帮助它闪烁。

这个方法NewsUpdate我通过计时器滴答事件调用它，它的间隔设置为1000毫秒

如何在没有眨眼的情况下使其平滑？

修改

这就是我添加了一个OnPaint覆盖事件：

protected override void OnPaint(PaintEventArgs e)
        {
            int percent = progressBar1.Value = counter;
            base.OnPaint(e);

            e.Graphics.DrawString(percent.ToString() + "%",
                SystemFonts.DefaultFont,
                Brushes.Black,
                new PointF(progressBar1.Width / 2 - (e.Graphics.MeasureString(percent.ToString() + "%",
                    SystemFonts.DefaultFont).Width / 2.0F),
                progressBar1.Height / 2 - (e.Graphics.MeasureString(percent.ToString() + "%",
                    SystemFonts.DefaultFont).Height / 2.0F)));

        }

在方法中我更新了我在无效时执行的计时器：

private void NewsUpdate()
        {
            counter += 1;
            this.Invalidate();

现在的问题是我看到form1顶部的百分比。如何将百分比移动到中间的progressBar上？

ProgressBar

修改

我现在尝试了这个：

protected override void OnPaint(PaintEventArgs e)
        {
            int percent = progressBar1.Value = counter;
            base.OnPaint(e);
            Graphics gr = e.Graphics;
            using (gr = progressBar1.CreateGraphics())
            {
                gr.DrawString(percent.ToString() + "%",
                    SystemFonts.DefaultFont,
                    Brushes.Black,
                    new PointF(progressBar1.Width / 2 - (gr.MeasureString(percent.ToString() + "%",
                        SystemFonts.DefaultFont).Width / 2.0F),
                    progressBar1.Height / 2 - (gr.MeasureString(percent.ToString() + "%",
                        SystemFonts.DefaultFont).Height / 2.0F)));
            }
        }

现在它在progressBar上，但再次闪烁。百分比在闪烁。

Answer 1

如果您已将进度条的最大值设置为100，则无需根据进度条值计算百分比。

private void progressbar1_Paint(object sender, PaintEventArgs e)
{
    StringFormat sf = new StringFormat();
    sf.Alignment = StringAlignment.Center;
    sf.LineAlignment = StringAlignment.Center;
    Font font = new Font("Arial", 8.25f, FontStyle.Bold, GraphicsUnit.Point);
    RectangleF rf = new RectangleF(0,0,progressbar1.Width, progressbar1.Height);
    e.Graphics.DrawString(progressbar1.Value.ToString("# %"), font, Brushes.Black,rf, sf);            
}

并将progressbar1.Invalidate()放在要更新progressbar1.Value

的位置

progressbar1.Value += 1;
progressbar1.Invalidate();

我如何在progressBar1上绘制百分比？

1 个答案: