gridview合并相同的行

#region 方法：合并Gridview行
    /// <summary>
    /// 合并GridView指定行单元格
    /// </summary>
    /// <param name="gv">GridView</param>
    /// <param name="DataKeysName">DataKeys值（以此值为参照，如果此值相同，则将指定的单元格纵向合并）</param>
    /// <param name="rowIndex">要合并的列索引（从0开始）</param>
    protected void AppendGVRow(string DataKeysName, GridView gv, params int[] rowIndex)
    {
        try
        {
            int spanCount = 1;//合并的单元格跨的行数
            int spanNum = -1;//用于确定需合并的起始行

for (int i = 0; i < rowIndex.Length; i++)
            {
                for (int j = 0; j < gv.Rows.Count - 1; j++)
                {
                    if (gv.DataKeys[j][DataKeysName].ToString().Trim() == gv.DataKeys[j + 1][DataKeysName].ToString().Trim())//如果两行的text相同，则合并
                    {
                        if (spanNum == -1)
                        {
                            spanNum = j;//将需要合并的起始行保存到spanNum中
                        }
                        spanCount++;//合并的单元格跨的行数自增1

gv.Rows[j + 1].Cells[rowIndex[i]].Visible = false;//将下一行隐藏
                        gv.Rows[spanNum].Cells[rowIndex[i]].RowSpan = spanCount;
                    }
                    else
                    {
                        spanNum = -1;
                        spanCount = 1;
                    }
                }

spanNum = -1;
                spanCount = 1;
            }
        }
        catch { }
    }
    #endregion