改变groupBox的边框颜色问题
我想改变groupBox的边框颜色，于是我照网上说的将groupBox重绘了，结果实现了改变边框颜色的效果，但是也有一个重大的bug，就是如果有弹框出现在groupBox的前面，将groupBox覆盖时，等弹框消失后，groupBox边框线就变形了，非常难看！！
请问怎么才能解决这个问题？

附上代码

C# code

private void groupBox1_Paint(object sender, PaintEventArgs e)        {            e.Graphics.FillRectangle(Brushes.Transparent, e.ClipRectangle);             Rectangle Rtg_LT = new Rectangle();            Rectangle Rtg_RT = new Rectangle();            Rectangle Rtg_LB = new Rectangle();            Rectangle Rtg_RB = new Rectangle();            Rtg_LT.X = 0; Rtg_LT.Y = 7; Rtg_LT.Width = 10; Rtg_LT.Height = 10;            Rtg_RT.X = e.ClipRectangle.Width - 11; Rtg_RT.Y = 7; Rtg_RT.Width = 10; Rtg_RT.Height = 10;            Rtg_LB.X = 0; Rtg_LB.Y = e.ClipRectangle.Height - 11; Rtg_LB.Width = 10; Rtg_LB.Height = 10;            Rtg_RB.X = e.ClipRectangle.Width - 11; Rtg_RB.Y = e.ClipRectangle.Height - 11; Rtg_RB.Width = 10; Rtg_RB.Height = 10;            Color color = BorderColor;            Pen Pen_AL = new Pen(color, 1);            Pen_AL.Color = color;            e.Graphics.DrawArc(Pen_AL, Rtg_LT, 180, 90);            e.Graphics.DrawArc(Pen_AL, Rtg_RT, 270, 90);            e.Graphics.DrawArc(Pen_AL, Rtg_LB, 90, 90);            e.Graphics.DrawArc(Pen_AL, Rtg_RB, 0, 90);            e.Graphics.DrawLine(Pen_AL, 5, 7, 6, 7);            e.Graphics.DrawLine(Pen_AL, e.Graphics.MeasureString(groupBox1.Text, groupBox1.Font).Width + 3, 7, e.ClipRectangle.Width - 7, 7);            e.Graphics.DrawLine(Pen_AL, 0, 13, 0, e.ClipRectangle.Height - 7);            e.Graphics.DrawLine(Pen_AL, 6, e.ClipRectangle.Height - 1, e.ClipRectangle.Width - 7, e.ClipRectangle.Height - 1);            e.Graphics.DrawLine(Pen_AL, e.ClipRectangle.Width - 1, e.ClipRectangle.Height - 7, e.ClipRectangle.Width - 1, 13);        }

[解决办法]
原因在于 e.ClipRectangle
建议你写成控件，颜色，圆角半径之类的，方便扩展

C# code

    class MyGroupBox:GroupBox    {        protected override void OnPaint(PaintEventArgs e)        {            using (Pen pen = new Pen(Color.SteelBlue))            using (GraphicsPath path = new GraphicsPath())            {                Rectangle arc = new Rectangle(0, 7, 10, 10);                path.AddArc(arc, 180, 90);                arc.X = this.Width - arc.Width - 1;                path.AddArc(arc, 270, 90);                arc.Y = this.Height - arc.Height - 1;                path.AddArc(arc, 0, 90);                arc.X = 0;                path.AddArc(arc, 90, 90);                path.CloseFigure();                e.Graphics.DrawPath(pen, path);            }            TextRenderer.DrawText(e.Graphics, this.Text, this.Font, new Point(7, 1), this.ForeColor, this.BackColor);        }    }