ASP.NET中實現GridView合併

       

              #region 合併多列
        /**/
        /// <summary>
        /// GridView合併
        /// </summary>
        /// <param name="gdv">GridView</param>
        /// <param name="startColumnIndex">起始列Index</param>
        /// <param name="endColumnIndex">結束列Index</param>
        public static void MergeGridViewRows(GridView gdv, int startColumnIndex, int endColumnIndex)
        {
            if (gdv == null || endColumnIndex < startColumnIndex || gdv.Rows.Count < 2)
                return;
            if (startColumnIndex < 0 || endColumnIndex > gdv.Columns.Count - 1)
                throw new ArgumentOutOfRangeException("列Index超出GridView可用列的範圍。");
            EndColumnIndex = endColumnIndex;
            //for (int i = 0; i <= endColumnIndex;i++ )
            //{
            //    MergeCellWithSubColumn(gdv, i, 0, gdv.Rows.Count - 1);
            //}
            MergeCellWithSubColumn(gdv, 0, 0, gdv.Rows.Count - 1);
            //MergeCellWithSubColumn(gdv, 9, 0, gdv.Rows.Count - 1);
        }
        private static int EndColumnIndex = 0;

        /**/
        /// <summary>
        /// 合併當前列和後續列
        /// </summary>
        /// <param name="currentColumnIndex">當前列</param>
        /// <param name="startRowIndex">起始行</param>
        /// <param name="endRowIndex">結束行</param>
        /// <summary>
        private static void MergeCellWithSubColumn(GridView gdv, int currentColumnIndex, int startRowIndex, int endRowIndex)
        {
            if (currentColumnIndex > EndColumnIndex)//結束遞歸
                return;
           
            string preValue = GetCellValue(gdv, startRowIndex, currentColumnIndex);//或採用參照列的值比較來實現合併
            string curValue = string.Empty;
            int endIndex = startRowIndex;
            for (int i = startRowIndex + 1; i <= endRowIndex + 1; i++)
            {
                if (i == endRowIndex + 1)
                    curValue = null;//完成最後一次合併
                else
                    curValue = GetCellValue(gdv, i, currentColumnIndex);//或採用參照列的值比較來實現合併
                if (curValue != preValue)
                {                   
                    //if(currentColumnIndex==9)
                    //    currentColumnIndex = currentColumnIndex;
                    //合併當前列
                    MergeColumnCell(gdv, currentColumnIndex, endIndex, i - 1);
                  
                    preValue = curValue;
                    endIndex = i;
                   
                }
            }
        }

        /// <summary>
        /// 取得GridView中單個Cell的值
        /// </summary>
        /// <param name="gdv">GridView</param>
        /// <param name="rowIndex">行Index</param>
        /// <param name="columnIndex">列Index</param>
        /// <returns></returns>
        private static string GetCellValue(GridView gdv, int rowIndex, int columnIndex)
        {
            return gdv.Rows[rowIndex].Cells[columnIndex].Text;
        }

        /**/
        /// <summary>
        /// 合併同列中連續的N個單元格
        /// 注意：這裏只是隱藏後續的單元格，而沒有刪除單元格
        /// 主要考慮到刪除後會如下兩種情況：
        /// 1. PostBack後找不回來；
        /// 2.通過rowIndex和columnIndex來定位單元格的過程會更復雜
        /// </summary>
        /// <param name="gdv">GridView</param>
        /// <param name="columnIndex">列Index</param>
        /// <param name="startRowIndex">起始行Index</param>
        /// <param name="endRowIndex">結束行Index</param>
        private static void MergeColumnCell(GridView gdv, int columnIndex, int startRowIndex, int endRowIndex)
        {
            gdv.Rows[startRowIndex].Cells[columnIndex].RowSpan = endRowIndex - startRowIndex + 1;
            for (int i = startRowIndex + 1; i <= endRowIndex; i++)
                gdv.Rows[i].Cells[columnIndex].Visible = false;
        }

        #endregion