.NET WinForms应用程序中的圆形渐变

我找到了解决办法 here .

private void label1_Paint(object sender, PaintEventArgs e)
{
    GraphicsPath gp = new GraphicsPath();
    gp.AddEllipse(label1.ClientRectangle);

    PathGradientBrush pgb = new PathGradientBrush(gp);

    pgb.CenterPoint = new PointF(label1.ClientRectangle.Width / 2, 
                                 label1.ClientRectangle.Height / 2);
    pgb.CenterColor = Color.White;
    pgb.SurroundingColors = new Color[] { Color.Red };

    e.Graphics.FillPath(pgb, gp);

    pgb.Dispose();
    gp.Dispose();
}