NPOI得简单使用

直接开整，使用：

//读取excel
var FileStreamfile = new FileStream(Server.MapPath("~/PrintTemplet/LuXianTemplet.xls"), FileMode.Open, FileAccess.Read);
HSSFWorkbook hssfworkbook = new HSSFWorkbook(FileStreamfile);
HSSFSheet sheet1 = (HSSFSheet)hssfworkbook.GetSheet("Sheet1");

//设置不是合并的单元格的内容
sheet1.GetRow(1).GetCell(0).SetCellValue(1111);

//设置合并单元格的内容
/// <summary>
        /// 设置合并单元格的值
        /// </summary>
        /// <param name="sheet">第一个sheet</param>
        /// <param name="row">行</param>
        /// <param name="column">列</param>
        /// <param name="setvalue">设置的内容</param>
        /// <returns></returns>
        private static void SetMergedRegionStr(ISheet sheet, int row, int column,string setvalue)
        {
            //初始化坐标
            Point start = new Point(0, 0);
            Point end = new Point(0, 0);
            //获取合并单元格的数量
            int regionsCount = sheet.NumMergedRegions;
            //初始化单元格的值
            object cellValue = new object();
            //判断坐标
            for (int j = 0; j < regionsCount; j++)
            {
                //获得不同坐标
                CellRangeAddress range = sheet.GetMergedRegion(j);
                //判读参数坐标是否存在
                if (row >= range.FirstRow && row <= range.LastRow && column >= range.FirstColumn && column <= range.LastColumn)
                {
                    //获取坐标
                    start = new Point(range.FirstRow, range.FirstColumn);
                    end = new Point(range.LastRow, range.LastColumn);
                    //坐标x=row,y=colum
                    int x = start.X;//获取所在坐标行号
                    int y = start.Y;//获取所在坐标列号
                    //获取所在行
                    IRow fRow = sheet.GetRow(x);
                    //获取所在列
                    ICell fCell = fRow.GetCell(y);
                    //判断cell的类型
                     fCell.SetCellValue(setvalue);
                }
            }
            
        }

//excel转html
ExcelToHtmlConverter excelToHtmlConverter = new ExcelToHtmlConverter();
                // 设置输出参数
               hssfworkbook.SetSheetName(0," ");//隐藏表名
                excelToHtmlConverter.OutputColumnHeaders = false;
						excelToHtmlConverter.OutputRowNumbers = false;
              excelToHtmlConverter.OutputLeadingSpacesAsNonBreaking = false;
                // 处理的Excel文件
                excelToHtmlConverter.ProcessWorkbook(hssfworkbook);
               excelToHtmlConverter.Document.InnerXml =
                    excelToHtmlConverter.Document.InnerXml.Insert(
                excelToHtmlConverter.Document.InnerXml.IndexOf("<head>", 0) + 6,
                 @"<style>table{width:100% } </style>"
                );

                excelToHtmlConverter.Document.Save(Server.MapPath("~/PrintTemplet/" + FileName));

创建

//建立空白工作薄
IWorkbook workbook = new HSSFWorkbook();

//在工作薄中建立工作表
ISheet sheet = workbook.CreateSheet();

//填充筛选的内容
sheet.CreateRow(0).CreateCell(0).SetCellValue("省份");
sheet.CreateRow(1).CreateCell(0).SetCellValue("河北省");
sheet.CreateRow(2).CreateCell(0).SetCellValue("湖南省");

//验证数字格式问题
sheet.GetRow(1).CreateCell(2).SetCellValue("123");
sheet.GetRow(2).CreateCell(2).SetCellValue(123);

//设置Excel的自动筛选
CellRangeAddress c = CellRangeAddress.ValueOf("A1");
sheet.SetAutoFilter(c);

//写文件
using (FileStream fs = new FileStream("haha.xls", FileMode.Create, FileAccess.Write))
{
    workbook.Write(fs);
}