/// <summary>
        /// 合并行
        /// </summary>
        /// <param name="sheet"></param>
        /// <param name="startRowIndex"></param>
        /// <param name="mergeRowIndexs">合并行的行数，起始位置，终止位置</param>
        public static void MergeRowCells(ExcelWorksheet sheet, int startRowIndex, int[,] mergeRowIndexs) {
            for (int i = 0; i < mergeRowIndexs.Rank; i++)
            {
                sheet.Cells[mergeRowIndexs[i, 0] + startRowIndex, mergeRowIndexs[i, 1], mergeRowIndexs[i, 0] + startRowIndex, mergeRowIndexs[i, 2]].Merge = true;
                sheet.Cells[mergeRowIndexs[i, 0] + startRowIndex, mergeRowIndexs[i, 1], mergeRowIndexs[i, 0] + startRowIndex, mergeRowIndexs[i, 2]].Style.VerticalAlignment = OfficeOpenXml.Style.ExcelVerticalAlignment.Center;
                sheet.Cells[mergeRowIndexs[i, 0] + startRowIndex, mergeRowIndexs[i, 1], mergeRowIndexs[i, 0] + startRowIndex, mergeRowIndexs[i, 2]].Style.HorizontalAlignment = OfficeOpenXml.Style.ExcelHorizontalAlignment.Center;

            }            
        }

//行
                int[,] mergeRowIndexs= { { 6, 2, 3 }, { 7, 2, 3 } };
                EpplusHelper.MergeRowCells(worksheet, 2,mergeRowIndexs);
                package.Save();