NPOI生成单元格（列）下拉框

客户提出能否将导入模板中，课程一列添加下拉框方便选择，不用手输入，以减少输入错误的可能性。于是在网上找了点代码，稍加整理后，形成了以下方案，代码部分：

一：生成课程列表，并放置在excel的单独sheet中。

IList<CourseCodeInfo> list = StudentBus.GetSubjectInterface().GetList(0, "", "Name");

var CourseSheetName = "Course";
var RangeName = "dicRange";

ISheet CourseSheet = workbook.CreateSheet(CourseSheetName);

CourseSheet.CreateRow(0).CreateCell(0).SetCellValue("课程列表（用于生成课程下拉框，请勿修改）");

for (var i = 1; i < list.Count; i++)
{
      CourseSheet.CreateRow(i).CreateCell(0).SetCellValue(list[i-1].Name);
}

 二：生成一个列表引用区域，方便需要的的地方加载这个引用区域。

IName range = workbook.CreateName();
range.RefersToFormula = string.Format("{0}!$A$2:$A${1}",CourseSheetName,list.Count.ToString());
range.NameName = RangeName;

三：引用以上生成的引用区域。

 

CellRangeAddressList regions = new CellRangeAddressList(1, 65535,4, 4);
DVConstraint constraint = DVConstraint.CreateFormulaListConstraint(RangeName);
HSSFDataValidation dataValidate = new HSSFDataValidation(regions, constraint);
sheet.AddValidationData(dataValidate);

备注：代码区域二和网上的代码略有不同，网上代码一般为：

HSSFName range = hssfworkbook.CreateName();
range.Reference = "ShtDictionary!$A1:$A3";
range.NameName = "dicRange";

 但在实际编写代码过程中，发现Hssfworkbook.CreateName()生成的是IName，无法直接转换为HSSFName，于是改为：

 IName range = workbook.CreateName();
 range.RefersToFormula = string.Format("{0}!$A$2:$A${1}",CourseSheetName,list.Count.ToString());
 range.NameName = RangeName;

运行也正常，奇怪为什么和网上代码不同呢？估计与NOPI版本有关吧。

后记：近期有园子里的朋友问有无源代码，我就将原来的代码找出来，贴在下面，供各位参考（代码写的久远，请勿见笑）。

        public ActionResult GetExcelTeacherClassTemplate()
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            ISheet sheet = workbook.CreateSheet("sheet1");

            IRow row = sheet.CreateRow(0);
            row.CreateCell(0).SetCellValue("姓名");
            row.CreateCell(1).SetCellValue("身份证号");
            row.CreateCell(2).SetCellValue("年级");
            row.CreateCell(3).SetCellValue("班级");
            row.CreateCell(4).SetCellValue("课程");
            row.CreateCell(5).SetCellValue("角色（班主任、单科老师）");


            IRow row1 = sheet.CreateRow(1);
            row1.CreateCell(0).SetCellValue("张峰");
            row1.CreateCell(1).SetCellValue("1111111111111");
            row1.CreateCell(2).SetCellValue("小学六年级");
            row1.CreateCell(3).SetCellValue("4班");
            row1.CreateCell(4).SetCellValue("语文");
            row1.CreateCell(5).SetCellValue("单科老师");

            var ic = workbook.CreateCellStyle();
            ic.DataFormat = HSSFDataFormat.GetBuiltinFormat("@");

            sheet.SetDefaultColumnStyle(1, ic);

            sheet.SetColumnWidth(1, 5000);
            sheet.SetColumnWidth(2, 4000);
            sheet.SetColumnWidth(3, 4000);
            sheet.SetColumnWidth(5, 24000);

            IList<CourseCodeInfo> list = StudentBus.GetSubjectInterface().GetList(0, "", "Name");
            var CourseSheetName = "Course";
            var RangeName = "dicRange";
            ISheet CourseSheet = workbook.CreateSheet(CourseSheetName);
            CourseSheet.CreateRow(0).CreateCell(0).SetCellValue("课程列表（用于生成课程下拉框，请勿修改）");
            for (var i = 1; i < list.Count; i++)
            {
                CourseSheet.CreateRow(i).CreateCell(0).SetCellValue(list[i-1].Name);
            }

            IName range = workbook.CreateName();
            range.RefersToFormula = string.Format("{0}!$A$2:$A${1}",CourseSheetName,list.Count.ToString());
            range.NameName = RangeName;
            //
            CellRangeAddressList regions = new CellRangeAddressList(1, 65535,4, 4);
            DVConstraint constraint = DVConstraint.CreateFormulaListConstraint(RangeName);
            HSSFDataValidation dataValidate = new HSSFDataValidation(regions, constraint);
            sheet.AddValidationData(dataValidate);

            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            workbook.Write(ms);
            Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode("教师授课模板.xls"));
            Response.BinaryWrite(ms.ToArray());
            workbook = null;
            ms.Close();
            ms.Dispose();
            return null;
        }