C# NPOI导出Excel横向纵向显示

        /// 

        /// DataTable导出Excel(纵向导出)
        /// 
        /// 数据源
        /// 保存的路径
        /// 表名
        public static void Excel2(this DataTable dataTable, string filePath, string documentname)
        {
            string sheetName = "Sheet1";
            if (dataTable == null || dataTable.Rows.Count == 0)
                throw new Exception("No data to export");

            ISheet sheet = null;
            IWorkbook workbook = null;

            try
            {
                if (Directory.Exists(filePath) == false)
                {
                    Directory.CreateDirectory(filePath);
                }
                string filedocmentname = "\\File Card.xls";//文件名
                using (FileStream fs = new FileStream(filePath + filedocmentname, FileMode.Create, FileAccess.Write))
                {
                    workbook = new HSSFWorkbook();
                    if (string.IsNullOrEmpty(sheetName))
                        sheetName = "Sheet1";//工作簿
                    sheet = workbook.CreateSheet(sheetName);
                    IRow row = sheet.CreateRow(0);
                    IFont font = workbook.CreateFont();
                    font.FontName = "Arial";//字体样式
                    font.Boldweight = (short)FontBoldWeight.Bold;
                    ICellStyle headerStyle2 = workbook.CreateCellStyle();
                    headerStyle2.VerticalAlignment = VerticalAlignment.Center; //垂直居中
                    headerStyle2.WrapText = true;//自动换行
                    font.FontHeightInPoints = 9;//字体

                    for (int i = 0; i < dataTable.Columns.Count; i++)
                    {
                        ICellStyle header= workbook.CreateCellStyle();
                        header.VerticalAlignment = VerticalAlignment.Center; //垂直居中
                        header.WrapText = true;//自动换行
                        var row1_ = sheet.CreateRow(i);//创建行
                        var cellName = row1_.CreateCell(0);//列名
                        cellName.SetCellValue(dataTable.Columns[i].ColumnName.ToString().Replace("
", "\n"));
                        IFont font2 = workbook.CreateFont();
                        font2.Boldweight = (short)FontBoldWeight.Bold;
                        header.SetFont(font);
                        cellName.CellStyle = header;
　　　　　　　　　　　　　　 //填充内容
                        for (int j = 0; j < dataTable.Rows.Count; j++)
                        {
                            var cell1_ = row1_.CreateCell(j + 1);
                            cell1_.SetCellValue(dataTable.Rows[j][i].ToString().Replace("
", "\n"));
                            cell1_.CellStyle = headerStyle2; //把样式赋给单元格
                        }
                    }
                    //设置列宽
                    sheet.SetColumnWidth(0, 10 * 256+200);//列宽为10
                    //设置行高
                    //row.Height = 30 * 20;//行高为30
                    workbook.Write(fs); //写入到excel
                }
            }
            finally
            {
                if (workbook != null)
                    workbook.Clear();
            }
        }

 　　　　 /// 

        /// DataTable导出Excel(横向导出)
        /// 
        /// 数据源
        /// 保存的路径
        /// 表名
        public static void Excel(this DataTable dataTable, string filePath, string documentname)
        {
　　　　　　　//datatable第一列增加序号
            dataTable= AddSeriNumToDataTable(dataTable);
            string sheetName = "Sheet1";
            if (dataTable == null || dataTable.Rows.Count == 0)
                throw new Exception("No data to export");

            ISheet sheet = null;
            IWorkbook workbook = null;

            try
            {
                if (Directory.Exists(filePath) == false)
                {
                    Directory.CreateDirectory(filePath);
                }
                string filedocmentname = "\\List.xls";//文件名
                using (FileStream fs = new FileStream(filePath + filedocmentname, FileMode.Create, FileAccess.Write))
                {
                    workbook = new HSSFWorkbook();
                    if (string.IsNullOrEmpty(sheetName))
                        sheetName = "Sheet1";
                    sheet = workbook.CreateSheet(sheetName);
                    IRow row = sheet.CreateRow(0);
                    IFont font = workbook.CreateFont();
                    font.FontName = "Arial";//字体样式
                    ICellStyle headerStyle2 = workbook.CreateCellStyle();
                    headerStyle2.VerticalAlignment = VerticalAlignment.Center; //垂直居中
                    headerStyle2.WrapText = true;//自动换行
                    font.FontHeightInPoints = 9;//字体
                    //填充表头
                    for (int columnIndex = 0; columnIndex < dataTable.Columns.Count; columnIndex++)
                    {
                        ICellStyle headerStyle = workbook.CreateCellStyle(); 
                        headerStyle.FillForegroundColor = IndexedColors.PaleBlue.Index;//首行填充颜色
                        headerStyle.FillPattern = FillPattern.SolidForeground;
                        headerStyle.VerticalAlignment = VerticalAlignment.Center; //垂直居中 
                        headerStyle.WrapText = true;//自动换行
                        headerStyle.BorderTop = BorderStyle.Thin;//上边框
                        headerStyle.BorderBottom = BorderStyle.Thin;//下边框
                        headerStyle.BorderLeft = BorderStyle.Thin;//左边框
                        headerStyle.BorderRight = BorderStyle.Thin;//右边框
                        var cell = row.CreateCell(columnIndex);
                        cell.CellStyle = headerStyle;
                        cell.SetCellValue(dataTable.Columns[columnIndex].ColumnName.Replace("
", "\n")); //设置列名
                        row.HeightInPoints= 35;
                    }
                    //填充内容
                    for (int rowIndex = 0; rowIndex < dataTable.Rows.Count; rowIndex++)
                    {
                        row = sheet.CreateRow(rowIndex + 1);
                        for (int columnIndex = 0; columnIndex < dataTable.Columns.Count; columnIndex++)
                        {
                            row.CreateCell(columnIndex).SetCellValue(Convert.ToString(dataTable.Rows[rowIndex][columnIndex]));
                            ICell cellData = row.CreateCell(columnIndex);
                            cellData.SetCellValue(dataTable.Rows[rowIndex][columnIndex].ToString().Replace("
", "\n"));
                            cellData.CellStyle = headerStyle2; //把样式赋给单元格
                        }
                    }
                    sheet.CreateFreezePane(0, 1, 0, 1); //首行冻结
                    workbook.Write(fs); //写入到excel
                }
            }
            finally
            {
                if (workbook != null)
                    workbook.Clear();
            }
        }

        /// 

        /// 在DataTable中添加一序号列，编号从1依次递增
        /// 
        /// DataTable
        /// 
        public static DataTable AddSeriNumToDataTable(DataTable dt)
        {
            //需要返回的值
            DataTable dtNew;
            if (dt.Columns.IndexOf("序号") >= 0)
            {
                dtNew = dt;
            }
            else //添加一序号列,并且在第一列
            {
                int rowLength = dt.Rows.Count;
                int colLength = dt.Columns.Count;
                DataRow[] newRows = new DataRow[rowLength];
                dtNew = new DataTable();
                //在第一列添加“序号”列
                dtNew.Columns.Add("序号");
                for (int i = 0; i < colLength; i++)
                {
                    dtNew.Columns.Add(dt.Columns[i].ColumnName);
                    //复制dt中的数据
                    for (int j = 0; j < rowLength; j++)
                    {
                        if (newRows[j] == null)
                            newRows[j] = dtNew.NewRow();
                        //将其他数据填充到第二列之后，因为第一列为新增的序号列
                        newRows[j][i + 1] = dt.Rows[j][i];
                    }
                }
                foreach (DataRow row in newRows)
                {
                    dtNew.Rows.Add(row);
                }
            }
            //对序号列填充，从1递增
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                dtNew.Rows[i]["序号"] = i + 1;
            }
            return dtNew;
        }

　　　　　/// 

        /// Datatable导出Excel(无任何样式)
        /// 
        /// DataTable
        /// 
        public static void ExportExcel(DataTable dataTable, string filePath, string documentname)
        {
            if (dataTable != null && dataTable.Rows.Count > 0)
            {
                HSSFWorkbook excelBook = new HSSFWorkbook();
                ISheet sheet1 = excelBook.CreateSheet("Export Data");
                IRow row1 = sheet1.CreateRow(0);

                //填充表头
                for (int i = 0; i < dataTable.Columns.Count; i++)
                {
                    row1.CreateCell(i).SetCellValue(dataTable.Columns[i].ColumnName);
                }

                //填充内容
                for (int i = 0; i < dataTable.Rows.Count; i++)
                {
                    IRow rowTemp = sheet1.CreateRow(i + 1);
                    for (int j = 0; j < dataTable.Columns.Count; j++)
                    {
                        rowTemp.CreateCell(j).SetCellValue(string.Format("{0}", dataTable.Rows[i][j]));
                    }
                }
                //保存
                MemoryStream ms = new MemoryStream();
                excelBook.Write(ms);
                if (Directory.Exists(filePath) == false)
                {
                    Directory.CreateDirectory(filePath);
                }
                string filedocmentname = "\\List.xls";
                using (FileStream fs = new FileStream(filePath + filedocmentname, FileMode.Create, FileAccess.Write))
                {
                    byte[] data = ms.ToArray();
                    fs.Write(data, 0, data.Length);
                    fs.Flush();
                }
                ms.Close();
                ms.Dispose();
            }
        }

纵向导出Excel效果图

横向导出Excel效果图

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