自定义控件 panel 描边及加属性

        //边框线的宽度
        const int LineWidth = 1;
        //边框线的颜色
        Color RGB = Color.FromArgb(126, 127, 133);

ControlPaint.DrawBorder(e.Graphics,
                this.icPanel.ClientRectangle,
                RGB,
                //left
               LineWidth,
                ButtonBorderStyle.Solid,
                RGB,
                //top
               LineWidth,
                ButtonBorderStyle.Solid,
                RGB,
                //right
               LineWidth,
                ButtonBorderStyle.Solid,
                RGB,
                //bottom
               LineWidth,
                ButtonBorderStyle.Solid);

核心方法如上

在自定义控件 panel 中加入这个方法和属性

（1）枚举值用来表示哪几条需要被画

    public enum BorderLineStyle
    {   None=0,
        Left = 1,
        Top = 2,
        Right = 4,
        Bottom = 8,
        All = ~0

}

（2）加入到panel 的属性中使得panel 可以直接在属性栏中添加

private BorderLineStyle _outline = 0;

        [Category("易迅")]
        [Description("获得或设置一个值，指示加边框线的位置")]
        public BorderLineStyle Outline
        {
            get { return _outline; }
            set
            {
                _outline = value;
            }
        }

（3）加入panel 的方法

private readonly int  lineWidth = 1;
        private readonly Color RGB = Color.FromArgb(126, 127, 133);
        /// <summary>
        /// 画边框线
        /// </summary>
        /// <param name="e"></param>
        private void PaintOutline(PaintEventArgs e)
        {
          ControlPaint.DrawBorder(e.Graphics,
          this.ClientRectangle,
          RGB,
              //left
          (_outline & BorderLineStyle.Left) == BorderLineStyle.Left ? lineWidth : 0,
          ButtonBorderStyle.Solid,
          RGB,
              //top
          (_outline & BorderLineStyle.Top) == BorderLineStyle.Top ? lineWidth : 0,
          ButtonBorderStyle.Solid,
          RGB,
              //right
          (_outline & BorderLineStyle.Right) == BorderLineStyle.Right ? lineWidth : 0,
          ButtonBorderStyle.Solid,
          RGB,
              //bottom
          (_outline & BorderLineStyle.Bottom) == BorderLineStyle.Bottom ? lineWidth : 0,
          ButtonBorderStyle.Solid);
        }