GridView合并单元格万能版（包括模板列）

今天修改旧的项目，发现之前用到的gridview合并单元格代码不适用于模板列。做了修改之后记录下来。
两种方法，第一种适用于所有情况，第二种适用于合并依据列非模板列。
两种方法如下：
方法一：

    /// <summary>
    /// 合并GridView中某列相同信息的行（单元格）   包含模板列  根据ID=rowspanid 的hiddenfield控件的值来合并。需要合并的 单元格需加上这个控件。根据控件值合并。可以将控件放在某一列，也可以放在每一列。取值的时候分开就行。此方法适合任意列，特别是模板列 无法取cell.text的时候
    /// </summary>
    /// <param name="GridView1">GridView</param>
    /// <param name="cellNums">合并第几列</param>
    /// <param name="rowspanid">合并依据控件ID，这里用的hiddenfield控件。只需将ID=rowspanid的hiddenfield控件放在单元格里即可</param>
    public static void GroupRows(GridView GridView1, int[] cellNums, string rowspanid = "hfrowspan")
    {
        foreach (int cellNum in cellNums)
        {
            int i = 0, rowSpanNum = 1;

            while (i < GridView1.Rows.Count - 1)
            {
                GridViewRow gvr = GridView1.Rows[i];

                for (++i; i < GridView1.Rows.Count; i++)
                {
                    GridViewRow gvrNext = GridView1.Rows[i];
                    if (((HiddenField)gvr.Cells[cellNum].FindControl(rowspanid)).Value == ((HiddenField)gvrNext.Cells[cellNum].FindControl(rowspanid)).Value)
                    {
                        gvrNext.Cells[cellNum].Visible = false;
                        rowSpanNum++;
                    }
                    else
                    {
                        gvr.Cells[cellNum].RowSpan = rowSpanNum;
                        rowSpanNum = 1;
                        break;
                    }

                    if (i == GridView1.Rows.Count - 1)
                    {
                        gvr.Cells[cellNum].RowSpan = rowSpanNum;
                    }
                }
            }

        }
    }

方法二：

  /// <summary>
    /// 根据某一列合并其他列。依据的列不能是模板列，否则请用上一个方法↑。
    /// </summary>
    /// <param name="GridView1">GridView</param>
    /// <param name="cellNums">合并第几列，数组</param>
    /// <param name="byCellNum">依据第几列</param>
    public static void GroupRowsByOne(GridView GridView1, int[] cellNums, int byCellNum)
    {
        foreach (int cellNum in cellNums)
        {
            int i = 0, rowSpanNum = 1;

            while (i < GridView1.Rows.Count - 1)
            {
                GridViewRow gvr = GridView1.Rows[i];

                for (++i; i < GridView1.Rows.Count; i++)
                {
                    GridViewRow gvrNext = GridView1.Rows[i];
                    //if (((HiddenField)gvr.Cells[cellNum].FindControl(rowspanid)).Value == ((HiddenField)gvrNext.Cells[cellNum].FindControl(rowspanid)).Value)
                    if(gvr.Cells[byCellNum].Text== gvrNext.Cells[byCellNum].Text)
                    {
                        gvrNext.Cells[cellNum].Visible = false;
                        rowSpanNum++;
                    }
                    else
                    {
                        gvr.Cells[cellNum].RowSpan = rowSpanNum;
                        rowSpanNum = 1;
                        break;
                    }

                    if (i == GridView1.Rows.Count - 1)
                    {
                        gvr.Cells[cellNum].RowSpan = rowSpanNum;
                    }
                }
            }

        }
    }