C#DataGridView单元格边框颜色问题（续）

连接单元格：

public class DataGridViewColorLinkCell : DataGridViewLinkCell
    {
        /// <summary>
        /// 是否可见
        /// </summary>
        public bool Display
        {
            get;
            set;
        }

        /// <summary>
        /// 头部边框颜色
        /// </summary>
        public Color TopBorderColor
        {
            get;
            set;
        }
        /// <summary>
        /// 右侧边框颜色
        /// </summary>
        public Color RightBorderColor
        {
            get;
            set;
        }
        /// <summary>
        /// 底部边框颜色
        /// </summary>
        public Color BottomBorderColor
        {
            get;
            set;
        }
        /// <summary>
        /// 左侧边框颜色
        /// </summary>
        public Color LeftBorderColor
        {
            get;
            set;
        }

        // Override the Clone method so that the Enabled property is copied.
        public override object Clone()
        {

            DataGridViewColorLinkCell cell =
                (DataGridViewColorLinkCell)base.Clone();

            cell.Display = this.Display;
            cell.TopBorderColor = this.TopBorderColor;
            cell.RightBorderColor = this.RightBorderColor;
            cell.BottomBorderColor = this.BottomBorderColor;
            cell.LeftBorderColor = this.LeftBorderColor;
            return cell;
        }

        // By default, enable the button cell.
        public DataGridViewColorLinkCell()
        {
            this.Display = true;
            this.TopBorderColor = Color.Empty;
            this.RightBorderColor = Color.Empty;
            this.BottomBorderColor = Color.Empty;
            this.LeftBorderColor = Color.Empty;
        }

        protected override void Paint(Graphics graphics,
            Rectangle clipBounds, Rectangle cellBounds, int rowIndex,
            DataGridViewElementStates elementState, object value,
            object formattedValue, string errorText,
            DataGridViewCellStyle cellStyle,
            DataGridViewAdvancedBorderStyle advancedBorderStyle,
            DataGridViewPaintParts paintParts)
        {
            // Draw the cell background, if specified.
            if ((paintParts & DataGridViewPaintParts.Background) ==
                DataGridViewPaintParts.Background)
            {

                SolidBrush cellBackground =
                    new SolidBrush(cellStyle.BackColor);
                graphics.FillRectangle(cellBackground, cellBounds);
                cellBackground.Dispose();
            }

            // Draw the cell borders, if specified.
            if ((paintParts & DataGridViewPaintParts.Border) ==

                DataGridViewPaintParts.Border)
            {
                PaintBorder(graphics, clipBounds, cellBounds, cellStyle,
                    advancedBorderStyle);

            }
            if (Display)
            {
                base.Paint(graphics, clipBounds, cellBounds, rowIndex,
                        elementState, value, formattedValue, errorText,
                        cellStyle, advancedBorderStyle, paintParts);
            }
            //绘制边框
            if (TopBorderColor != Color.Empty)
            {
                graphics.DrawLine(new Pen(TopBorderColor), cellBounds.X, cellBounds.Y, cellBounds.X + cellBounds.Width, cellBounds.Y);
            }
            if (RightBorderColor != Color.Empty)
            {
                graphics.DrawLine(new Pen(RightBorderColor), cellBounds.X + cellBounds.Width-1, cellBounds.Y, cellBounds.X + cellBounds.Width-1, cellBounds.Y + cellBounds.Height);
            }
            if (BottomBorderColor != Color.Empty)
            {
                graphics.DrawLine(new Pen(BottomBorderColor), cellBounds.X, cellBounds.Y + cellBounds.Height-1, cellBounds.X + cellBounds.Width, cellBounds.Y + cellBounds.Height-1);
            }
            if (LeftBorderColor != Color.Empty)
            {
                graphics.DrawLine(new Pen(LeftBorderColor), cellBounds.X, cellBounds.Y, cellBounds.X, cellBounds.Y + cellBounds.Height);
            }
        }
    }

单元格列：

public class DataGridViewColorLinkColumn : DataGridViewLinkColumn
    {
        public DataGridViewColorLinkColumn()
        {
            this.CellTemplate = new DataGridViewColorLinkCell();
        }
    }