C# DataGridView 导出 Excel(根据Excel版本显示选择不同后缀格式xls或xlsx)

/// <summary>
        /// DataGridView导出至Excel,解决问题:打开Excel文件格式与扩展名指定格式不一致
        /// </summary>
        /// <param name="dataGridView">数据源表格</param>
        /// <param name="isShowExcle">导出时是否显示excel界面</param>
        /// <returns></returns>
        public static bool DcExcel(DataGridView dataGridView, bool isShowExcle = true)
        {
            int FormatNum;//保存excel文件的格式
            Excel.Application excel = new Excel.Application();
            string excelVersion = excel.Version;//获取你使用的excel 的版本号 

            //声明保存对话框
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            //默然文件后缀
            saveFileDialog.DefaultExt = "xls";

            if (Convert.ToDouble(excelVersion) < 12)//You use Excel 97-2003
            {
                FormatNum = -4143;
                //文件后缀列表
                saveFileDialog.Filter = "Excel(*.xls)|*.xls";
            }
            else//you use excel 2007 or later
            {
                FormatNum = 56;
                //文件后缀列表
                saveFileDialog.Filter = "Excel(*.xls)|*.xls|Excel(2007-2016)(*.xlsx)|*.xlsx";
            }
            Form fr = dataGridView.Parent as Form;
            if (fr != null)//默认文件名
            {
                saveFileDialog.FileName = fr.Text;
            }
            //默然路径是系统当前路径
            saveFileDialog.InitialDirectory = Directory.GetCurrentDirectory();
            //打开保存对话框
            if (saveFileDialog.ShowDialog() == DialogResult.Cancel)
                return false;
            //返回文件路径
            string fileName = saveFileDialog.FileName;
            if (string.IsNullOrEmpty(fileName.Trim()))
            { return false; }

            if (dataGridView.Rows.Count == 0)
                return false;
            //建立Excel对象      

            var objWorkbook = excel.Application.Workbooks.Add(true);
            excel.Visible = isShowExcle;
            //生成字段名称
            for (int i = 0; i < dataGridView.ColumnCount; i++)
            {
                excel.Cells[1, i + 1] = dataGridView.Columns[i].HeaderText;
                excel.Cells[1, i + 1].Font.Bold = true;
            }
            //填充数据
            for (int i = 0; i < dataGridView.RowCount - 1; i++)
            {
                for (int j = 0; j < dataGridView.ColumnCount; j++)
                {
                    if (dataGridView[j, i].ValueType == typeof(string))
                    {
                        excel.Cells[i + 2, j + 1] = "'" + dataGridView[j, i].Value.ToString();
                    }
                    else
                    {
                        excel.Cells[i + 2, j + 1] = dataGridView[j, i].Value.ToString();
                    }
                }
            }
            //Excel.XlFileFormat.xlOpenXMLWorkbook（.xlsx）
            //Excel.XlFileFormat.xlExcel8（Excel97 - 2003, .xls）　　　　　　　//判断excel文件的保存格式是xls还是xlsx
            var format = fileName.EndsWith(".xls") ? Excel.XlFileFormat.xlExcel8 : Excel.XlFileFormat.xlOpenXMLWorkbook;
            objWorkbook.SaveAs(fileName, format, Missing.Value, Missing.Value, Missing.Value,
                Missing.Value, Excel.XlSaveAsAccessMode.xlShared, Missing.Value, Missing.Value, Missing.Value,
                Missing.Value, Missing.Value);
            return true;
        }