winform 自定义控件_为TabelLayoutPanel添加一个边框颜色的属性

using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace UserControl
{
    public partial class TableLayoutPanelUserControl : TableLayoutPanel
    {
        public TableLayoutPanelUserControl()
        {
            // 控件风格
            SetStyle(ControlStyles.SupportsTransparentBackColor, true);
            SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
            SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            SetStyle(ControlStyles.ResizeRedraw, true);
            SetStyle(ControlStyles.UserPaint, true);

            //设置默认边框颜色为黑色
            BorderColor = Color.Black;
        }

        #region 边框

        /// <summary>
        /// 获取或设置按钮边框颜色
        /// </summary>
        /// <value>The color of the focus.</value>
        [Browsable(true), DefaultValue(typeof(Color), "Black"), Description("按钮边框颜色")]
        [Category("Appearance")]
        public Color BorderColor { get; set; }

        #endregion

        //Table边框的绘制需要对每一个单元格的边框进行绘制
        protected override void OnCellPaint(TableLayoutCellPaintEventArgs e)
        {
            base.OnCellPaint(e);
            var panel = this as TableLayoutPanel;
            e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
            var rectangle = e.CellBounds;
            using (Pen pen = new Pen(BorderColor))
            {
                pen.Alignment = PenAlignment.Center;
                pen.DashStyle = DashStyle.Solid;

                if (e.Row == (panel.RowCount - 1))
                {
                    rectangle.Height -= 1;
                }

                if (e.Column == (panel.ColumnCount - 1))
                {
                    rectangle.Width -= 1;
                }

                e.Graphics.DrawRectangle(pen, rectangle);
            }
        }
    }
}