在Winfrom下的对DataGridView单元格合并

最近接了一个若差事,要在DataGridView中实现单元格合并,嘿,可搞惨我也,要是Asp.net中对我不是小菜碟吗?找了老半天,也没见一个现成例子,小鸟没法只能自己写了一个变想的,只实现了横向单元格合并,纵向还没时间做,如有哪位高手能把它加工,小弟会感激不尽,哈哈,费话少说,转入正题,请看代码:

using System;
using System.Collections.Generic;
using System.Text;

using System.Windows.Forms;
using System.Collections;
using System.Drawing;

namespace OPSS.Logic.Checks
{
    /// <summary>
    /// 对DataGridView进行合并操作的类
    /// </summary>
    public class DGVOper
    {
                
        private static SortedList rowSpan = new SortedList();//取得需要重新绘制的单元格
        private static string rowValue = "";//重新绘制的文本框内容
       
        #region  单元格绘制
        /// <summary>
        ///
        /// DataGridView合并单元格(横向)
        /// </summary>
        /// <param name="dgv">绘制的DataGridview </param>
        /// <param name="cellArgs">绘制单元格的参数（DataGridview的CellPainting事件中参数）</param>
        /// <param name="minColIndex">起始单元格在DataGridView中的索引号</param>
        /// <param name="maxColIndex">结束单元格在DataGridView中的索引号</param>
        public static void MerageRowSpan(DataGridView dgv, DataGridViewCellPaintingEventArgs cellArgs, int minColIndex, int maxColIndex)
        {
            if (cellArgs.ColumnIndex < minColIndex || cellArgs.ColumnIndex > maxColIndex) return;

            Rectangle rect=new Rectangle();
            using (Brush gridBrush = new SolidBrush(dgv.GridColor),
                backColorBrush = new SolidBrush(cellArgs.CellStyle.BackColor))
            {
                //抹去原来的cell背景
                cellArgs.Graphics.FillRectangle(backColorBrush, cellArgs.CellBounds);
            }
            cellArgs.Handled = true;

            if (rowSpan[cellArgs.ColumnIndex] == null)
            {
                //首先判断当前单元格是不是需要重绘的单元格
                //保留此单元格的信息，并抹去此单元格的背景
                rect.X = cellArgs.CellBounds.X;
                rect.Y = cellArgs.CellBounds.Y;
                rect.Width = cellArgs.CellBounds.Width;
                rect.Height = cellArgs.CellBounds.Height;
               
                rowValue += cellArgs.Value.ToString();
                rowSpan.Add(cellArgs.ColumnIndex, rect);
                if (cellArgs.ColumnIndex != maxColIndex)
                    return;
                MeragePrint(dgv, cellArgs, minColIndex, maxColIndex);
            }
            else
            {
                IsPostMerage(dgv, cellArgs, minColIndex, maxColIndex);
            }
        }

        /// <summary>
        /// 不是初次单元格绘制
        /// </summary>
        /// <param name="dgv"></param>
        /// <param name="cellArgs"></param>
        /// <param name="minColIndex"></param>
        /// <param name="maxColIndex"></param>
        public static void IsPostMerage(DataGridView dgv, DataGridViewCellPaintingEventArgs cellArgs, int minColIndex, int maxColIndex)
        {
            //比较单元是否有变化
            Rectangle rectArgs = (Rectangle)rowSpan[cellArgs.ColumnIndex];
            if (rectArgs.X != cellArgs.CellBounds.X || rectArgs.Y != cellArgs.CellBounds.Y
                || rectArgs.Width != cellArgs.CellBounds.Width || rectArgs.Height != cellArgs.CellBounds.Height)
            {
                rectArgs.X = cellArgs.CellBounds.X;
                rectArgs.Y = cellArgs.CellBounds.Y;
                rectArgs.Width = cellArgs.CellBounds.Width;
                rectArgs.Height = cellArgs.CellBounds.Height;
                rowSpan[cellArgs.ColumnIndex] = rectArgs;
            }
            MeragePrint(dgv,cellArgs,minColIndex,maxColIndex);
           
        }

        //画制单元格
        private static void MeragePrint(DataGridView dgv, DataGridViewCellPaintingEventArgs cellArgs, int minColIndex, int maxColIndex)
            {

                int width = 0;//合并后单元格总宽度
                int height = cellArgs.CellBounds.Height;//合并后单元格总高度
               
                for (int i = minColIndex; i <= maxColIndex;i++ )
                {
                    width += ((Rectangle)rowSpan[i]).Width;
                }

                Rectangle rectBegin = (Rectangle)rowSpan[minColIndex];//合并第一个单元格的位置信息
                Rectangle rectEnd = (Rectangle)rowSpan[maxColIndex];//合并最后一个单元格的位置信息
               
                //合并单元格的位置信息
                Rectangle reBounds = new Rectangle();
                reBounds.X = rectBegin.X;
                reBounds.Y = rectBegin.Y;
                reBounds.Width = width - 1;
                reBounds.Height = height - 1;

                using (Brush gridBrush = new SolidBrush(dgv.GridColor),
                             backColorBrush = new SolidBrush(cellArgs.CellStyle.BackColor))
                {
                    using (Pen gridLinePen = new Pen(gridBrush))
                    {
                        // 画出上下两条边线，左右边线无
                        Point blPoint = new Point(rectBegin.Left, rectBegin.Bottom - 1);//底线左边位置
                        Point brPoint = new Point(rectEnd.Right - 1, rectEnd.Bottom - 1);//底线右边位置
                        cellArgs.Graphics.DrawLine(gridLinePen, blPoint, brPoint);//下边线

                        Point tlPoint = new Point(rectBegin.Left, rectBegin.Top);//上边线左边位置
                        Point trPoint = new Point(rectEnd.Right - 1, rectEnd.Top);//上边线右边位置
                        cellArgs.Graphics.DrawLine(gridLinePen, tlPoint, trPoint); //上边线

                        Point ltPoint = new Point(rectBegin.Left, rectBegin.Top);//左边线顶部位置
                        Point lbPoint = new Point(rectBegin.Left, rectBegin.Bottom - 1);//左边线底部位置
                        cellArgs.Graphics.DrawLine(gridLinePen, ltPoint, lbPoint); //左边线

                        Point rtPoint = new Point(rectEnd.Right - 1, rectEnd.Top);//右边线顶部位置
                        Point rbPoint = new Point(rectEnd.Right - 1, rectEnd.Bottom - 1);//右边线底部位置
                        cellArgs.Graphics.DrawLine(gridLinePen, rtPoint, rbPoint); //右边线

                        //计算绘制字符串的位置
                        SizeF sf = cellArgs.Graphics.MeasureString(rowValue, cellArgs.CellStyle.Font);
                        float lstr = (width - sf.Width) / 2;
                        float rstr = (height - sf.Height) / 2;

                        //画出文本框
                        if (rowValue != "")
                        {
                            cellArgs.Graphics.DrawString(rowValue, cellArgs.CellStyle.Font,
                                                       new SolidBrush(cellArgs.CellStyle.ForeColor),
                                                         rectBegin.Left + lstr,
                                                         rectBegin.Top + rstr,
                                                         StringFormat.GenericDefault);
                        }
                    }
                    cellArgs.Handled = true;
                }
                   
            }
        #endregion
    
    }
}

=======================================================
在DataGridView页面的DataGridView的CellPainting事件中写下下面代码就OK了

       #region 统计行单元格绘制
        private void dgConfirm_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
        {
            if (e.RowIndex!=-1  && dgConfirm.Rows[e.RowIndex].Cells[1].Value.ToString()==" "  )
            {
                e.CellStyle.Font = new Font(dgConfirm.DefaultCellStyle.Font, FontStyle.Bold);
                e.CellStyle.WrapMode = DataGridViewTriState.True;
                DGVOper.MerageRowSpan(dgConfirm, e, 1, 2);
            }
           
            //重绘统计行的选择框背景
            if ((e.RowIndex == dgConfirm.Rows.Count - 1) && (e.ColumnIndex==0))
            {
                Rectangle rect = new Rectangle();
                rect.X = e.CellBounds.X;
                rect.Y = e.CellBounds.Y;
                rect.Width = e.CellBounds.Width;
                rect.Height = e.CellBounds.Height;
                e.Paint(rect,DataGridViewPaintParts.ContentBackground);
                e.PaintBackground(rect,false);
                e.Handled = true;
          }
        }
        #endregion

怎么样效果行吗?