c# 导入导出Excel

 public string EntityListToExcel(string physicalPath, IList<ExportCatalog> enList, string sheetName)
        {
            var folderPath = MyPathHelper.GetFolderPath(physicalPath);
            var workbook = new Workbook();
            var sheet = workbook.Sheets.AddSheet(sheetName);
            var headers = sheet["A1", "C1"];
            headers[0].Value = "学段"; //access a cell relative to range‘s top-left corner
            headers[1].Value = "年级";
            headers[2].Value = "学科";
            headers[3].Value = "知识点目录";
            headers[4].Value = "知识点";
            int rowIndex = 1; // 从第二行开始赋值(第一行已设置为单元头)
            foreach (var en in enList)
            {
                sheet[rowIndex, 0].Value = en.phaseName;
                sheet[rowIndex, 1].Value = en.gradeName;
                sheet[rowIndex, 2].Value =en.subjectName;
                sheet[rowIndex, 3].Value = en.oneName;
                sheet[rowIndex, 4].Value = en.twoName;
                rowIndex++;
            }
            workbook.Save(physicalPath);
            return folderPath;
        }