npoi实现 从固定的行读取数据作为表头并返回datable

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.IO;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.HPSF;
using System.Drawing;
using NPOI.SS.Util;
using NPOI.HSSF.Util;
using System.Web;


namespace Nopi
{
    public static class NOPIHelper
    {
        #region DataTable导出到Excel

        /// <summary>   
        /// 用于Web导出   
        /// </summary>   
        /// <param name="dtSource">源DataTable</param>   
        /// <param name="strHeaderText">表头文本</param>   
        /// <param name="strFileName">文件名</param>   
        public static void ExportByWeb(DataTable dtSource, string strFileName)
        {

            HttpContext curContext = HttpContext.Current;

            // 设置编码和附件格式   
            curContext.Response.ContentType = "application/vnd.ms-excel";
            curContext.Response.ContentEncoding = Encoding.UTF8;
            curContext.Response.Charset = "";
            curContext.Response.AppendHeader("Content-Disposition",
                "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));

            curContext.Response.BinaryWrite(Export(dtSource).GetBuffer());
            curContext.Response.End();

        }

        /// <summary>   
        /// DataTable导出到Excel的MemoryStream   
        /// </summary>   
        /// <param name="dtSource">源DataTable</param>   
        /// <param name="strHeaderText">表头文本</param>    
        public static MemoryStream Export(DataTable dtSource)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            ISheet sheet = workbook.CreateSheet();

            #region 右击文件 属性信息
            {
                DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
                dsi.Company = "XXXX";
                workbook.DocumentSummaryInformation = dsi;

                SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
                si.Author = "XXXX"; //填加xls文件作者信息   
                si.ApplicationName = "导出程序"; //填加xls文件创建程序信息   
                si.LastAuthor = "XXXX"; //填加xls文件最后保存者信息   
                si.Comments = "XXXX"; //填加xls文件作者信息   
                si.Title = "XXXX"; //填加xls文件标题信息   
                si.Subject = "XXXX";//填加文件主题信息   
                si.CreateDateTime = DateTime.Now;
                workbook.SummaryInformation = si;
            }
            #endregion

            ICellStyle dateStyle = workbook.CreateCellStyle();
            IDataFormat format = workbook.CreateDataFormat();
            dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");

            //取得列宽   
            int[] arrColWidth = new int[dtSource.Columns.Count];
            foreach (DataColumn item in dtSource.Columns)
            {
                arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
            }
            for (int i = 0; i < dtSource.Rows.Count; i++)
            {
                for (int j = 0; j < dtSource.Columns.Count; j++)
                {
                    int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
                    if (intTemp > arrColWidth[j])
                    {
                        arrColWidth[j] = intTemp;
                    }
                }
            }

            int rowIndex = 0;

            foreach (DataRow row in dtSource.Rows)
            {
                #region 新建表，填充表头，填充列头，样式
                if (rowIndex == 65535 || rowIndex == 0)
                {
                    if (rowIndex != 0)
                    {
                        sheet = workbook.CreateSheet();
                    }

                    //#region 表头及样式
                    //{
                    //    IRow headerRow = sheet.CreateRow(0);
                    //    headerRow.HeightInPoints = 25;
                    //    headerRow.CreateCell(0).SetCellValue(strHeaderText);

                    //    ICellStyle headStyle = workbook.CreateCellStyle();
                    //    headStyle.Alignment = HorizontalAlignment.CENTER;
                    //    IFont font = workbook.CreateFont();
                    //    font.FontHeightInPoints = 20;
                    //    font.Boldweight = 700;
                    //    headStyle.SetFont(font);

                    //    headerRow.GetCell(0).CellStyle = headStyle;

                    //    sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));
                    //}
                    //#endregion


                    #region 列头及样式
                    {
                        IRow headerRow = sheet.CreateRow(0);

                        ICellStyle headStyle = workbook.CreateCellStyle();
                        headStyle.Alignment = HorizontalAlignment.CENTER;
                        IFont font = workbook.CreateFont();
                        font.FontHeightInPoints = 10;
                        font.Boldweight = 700;
                        headStyle.SetFont(font);


                        foreach (DataColumn column in dtSource.Columns)
                        {
                            headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                            headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

                            //设置列宽   
                            sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);

                        }
                    }
                    #endregion

                    rowIndex = 1;
                }
                #endregion


                #region 填充内容
                IRow dataRow = sheet.CreateRow(rowIndex);
                foreach (DataColumn column in dtSource.Columns)
                {
                    ICell newCell = dataRow.CreateCell(column.Ordinal);

                    string drValue = row[column].ToString();

                    switch (column.DataType.ToString())
                    {
                        case "System.String"://字符串类型   
                            newCell.SetCellValue(drValue);
                            break;
                        case "System.DateTime"://日期类型   
                            DateTime dateV;
                            DateTime.TryParse(drValue, out dateV);
                            newCell.SetCellValue(dateV);

                            newCell.CellStyle = dateStyle;//格式化显示   
                            break;
                        case "System.Boolean"://布尔型   
                            bool boolV = false;
                            bool.TryParse(drValue, out boolV);
                            newCell.SetCellValue(boolV);
                            break;
                        case "System.Int16"://整型   
                        case "System.Int32":
                        case "System.Int64":
                        case "System.Byte":
                            int intV = 0;
                            int.TryParse(drValue, out intV);
                            newCell.SetCellValue(intV);
                            break;
                        case "System.Decimal"://浮点型   
                        case "System.Double":
                            double doubV = 0;
                            double.TryParse(drValue, out doubV);
                            newCell.SetCellValue(doubV);
                            break;
                        case "System.DBNull"://空值处理   
                            newCell.SetCellValue("");
                            break;
                        default:
                            newCell.SetCellValue("");
                            break;
                    }

                }
                #endregion

                rowIndex++;
            }


            using (MemoryStream ms = new MemoryStream())
            {
                workbook.Write(ms);
                ms.Flush();
                ms.Position = 0;
                return ms;
            }

        }

        /// <summary>
        /// 获取属性名称相关联的的单元格索引
        /// </summary>
        /// <param name="propName"></param>
        private static int GetCell(string propName, IRow headerRow)
        {
            var findCell = headerRow.Cells.First(cell => cell.StringCellValue.Equals(GetChineseHerder(propName)));
            if (findCell != null)
            {
                return headerRow.Cells.IndexOf(findCell);
            }
            else
            {
                throw new Exception(string.Format("没找发现与属性{0}相对应的中文属性", propName));
            }
        }

        public static string GetChineseHerder(string propName)
        {
            propName = propName.ToUpper();
            switch (propName)
            {
                case "ZCBM":
                    return "资产编码";
                case "ZCMC":
                    return "资产名称";
                case "GGXH":
                    return "规格型号";
                case "CPJH":
                    return "车牌井号";
                case "AZDD":
                    return "安装地点";
                case "FHSL":
                    return "复合数量";
                case "JSZK":
                    return "技术状况";
                case "SYZK":
                    return "使用状况";
                case "ZRR":
                    return "责任人";
                case "PDSJ":
                    return "盘点时间";
                case "PDZK":
                    return "盘点状况";
                case "PYPKYY":
                    return "盘盈盘亏原因";
                default:
                    return string.Empty;
            }
        }

        //private static IRow GetRow(string zcbm, ISheet sheet)
        //{
        //    for (int i = 0; i <= sheet.LastRowNum; i++)
        //    {
        //        if (sheet.GetRow(i).Cells[0].StringCellValue.Equals(zcbm))
        //        {
        //            return sheet.GetRow(i);
        //        }
        //    }

        //    throw new Exception(string.Format("没找到与资产编码{0}匹配的行", zcbm));
        //}
        #endregion

        #region 读取excel中内容 返回DataTable
        public static DataTable ExcelToDataTable(string excelPath, string sheetName)
        {
            return ExcelToDataTable(excelPath, sheetName, true);
        }
        public static DataTable ExcelToDataTable(string excelPath, string sheetName, bool firstRowAsHeader)
        {
            using (FileStream fileStream = new FileStream(excelPath, FileMode.Open, FileAccess.Read))
            {
                HSSFWorkbook workbook = new HSSFWorkbook(fileStream);

                HSSFFormulaEvaluator evaluator = new HSSFFormulaEvaluator(workbook);

                HSSFSheet sheet = workbook.GetSheet(sheetName) as HSSFSheet;

                return ExcelToDataTable(sheet, evaluator, firstRowAsHeader);
            }
        }

        private static DataTable ExcelToDataTable(HSSFSheet sheet, HSSFFormulaEvaluator evaluator, bool firstRowAsHeader)
        {
            if (firstRowAsHeader)
            {
                return ExcelToDataTableFirstRowAsHeader(sheet, evaluator);
            }
            else
            {
                return ExcelToDataTable(sheet, evaluator);
            }
        }
        private static DataTable ExcelToDataTableFirstRowAsHeader(HSSFSheet sheet, HSSFFormulaEvaluator evaluator)
        {
            using (DataTable dt = new DataTable())
            {
                HSSFRow firstRow = sheet.GetRow(0) as HSSFRow;
                int cellCount = GetCellCount(sheet);

                for (int i = 0; i < cellCount; i++)
                {
                    if (firstRow.GetCell(i) != null)
                    {
                        dt.Columns.Add(firstRow.GetCell(i).StringCellValue ?? string.Format("F{0}", i + 1), typeof(string));
                    }
                    else
                    {
                        dt.Columns.Add(string.Format("F{0}", i + 1), typeof(string));
                    }
                }
                    
                for (int i = 1; i <= sheet.LastRowNum; i++)
                {
                    HSSFRow row = sheet.GetRow(i) as HSSFRow;
                    DataRow dr = dt.NewRow();
                    FillDataRowByHSSFRow(row, evaluator, ref dr);
                    dt.Rows.Add(dr);
                }

                dt.TableName = sheet.SheetName;
                return dt;
            }
        }
        private static DataTable ExcelToDataTable(HSSFSheet sheet, HSSFFormulaEvaluator evaluator)
        {
            using (DataTable dt = new DataTable())
            {
                if (sheet.LastRowNum != 0)
                {
                    int cellCount = GetCellCount(sheet);

                    for (int i = 0; i < cellCount; i++)
                    {
                        dt.Columns.Add(string.Format("F{0}", i), typeof(string));
                    }

                    for (int i = 0; i < sheet.FirstRowNum; ++i)
                    {
                        DataRow dr = dt.NewRow();
                        dt.Rows.Add(dr);
                    }

                    for (int i = sheet.FirstRowNum; i <= sheet.LastRowNum; i++)
                    {
                        HSSFRow row = sheet.GetRow(i) as HSSFRow;
                        DataRow dr = dt.NewRow();
                        FillDataRowByHSSFRow(row, evaluator, ref dr);
                        dt.Rows.Add(dr);
                    }
                }

                dt.TableName = sheet.SheetName;
                return dt;
            }
        }
        private static void FillDataRowByHSSFRow(HSSFRow row, HSSFFormulaEvaluator evaluator, ref DataRow dr)
        {
            if (row != null)
            {
                for (int j = 0; j < dr.Table.Columns.Count; j++)
                {
                    HSSFCell cell = row.GetCell(j) as HSSFCell;

                    if (cell != null)
                    {
                        switch (cell.CellType)
                        {
                            case CellType.BLANK:
                                dr[j] = DBNull.Value;
                                break;
                            case CellType.BOOLEAN:
                                dr[j] = cell.BooleanCellValue;
                                break;
                            case CellType.NUMERIC:
                                if (DateUtil.IsCellDateFormatted(cell))
                                {
                                    dr[j] = cell.DateCellValue;
                                }
                                else
                                {
                                    dr[j] = cell.NumericCellValue;
                                }
                                break;
                            case CellType.STRING:
                                dr[j] = cell.StringCellValue;
                                break;
                            case CellType.ERROR:
                                dr[j] = cell.ErrorCellValue;
                                break;
                            case CellType.FORMULA:
                                cell = evaluator.EvaluateInCell(cell) as HSSFCell;
                                dr[j] = cell.ToString();
                                break;
                            default:
                                throw new NotSupportedException(string.Format("Catched unhandle CellType[{0}]", cell.CellType));
                        }
                    }
                }
            }
        }
        private static int GetCellCount(HSSFSheet sheet)
        {
            int firstRowNum = sheet.FirstRowNum;

            int cellCount = 0;

            for (int i = sheet.FirstRowNum; i <= sheet.LastRowNum; ++i)
            {
                HSSFRow row = sheet.GetRow(i) as HSSFRow;

                if (row != null && row.LastCellNum > cellCount)
                {
                    cellCount = row.LastCellNum;
                }
            }

            return cellCount;
        }
        #endregion

        #region 读取excel中内容,选择固定的行作为列名 返回DataTable
        /**
         * 读取excel中内容,选择固定的行作为列名 返回DataTable
         * 2015-03-26wytadd
         * excelPath url
         * sheetName sheet名
         * rowNumber 从哪行开始读取数据并作为表头
         */
        public static DataTable ExcelToDataTable(string excelPath, string sheetName,int rowNumber)
        {
            if (rowNumber > 0)
            {
                return ExcelToDataTable(excelPath, sheetName, false, rowNumber);
            }
            else {
                return ExcelToDataTable(excelPath, sheetName, true, rowNumber);
            }
            
        }
        public static DataTable ExcelToDataTable(string excelPath, string sheetName, bool firstRowAsHeader, int rowNumber)
        {
            using (FileStream fileStream = new FileStream(excelPath, FileMode.Open, FileAccess.Read))
            {
                HSSFWorkbook workbook = new HSSFWorkbook(fileStream);

                HSSFFormulaEvaluator evaluator = new HSSFFormulaEvaluator(workbook);

                HSSFSheet sheet = workbook.GetSheet(sheetName) as HSSFSheet;

                return ExcelToDataTable(sheet, evaluator, firstRowAsHeader,rowNumber);
            }
        }

        private static DataTable ExcelToDataTable(HSSFSheet sheet, HSSFFormulaEvaluator evaluator, bool firstRowAsHeader, int rowNumber)
        {
            if (firstRowAsHeader)
            {
                return ExcelToDataTableFirstRowAsHeader(sheet, evaluator);
            }
            else
            {
                if (rowNumber==0)
                {
                return ExcelToDataTable(sheet, evaluator);
                }else{
                    return ExcelToDataTableRowNumberRowAsHeader(sheet, evaluator,rowNumber);
                }
            }
        }
        private static DataTable ExcelToDataTableRowNumberRowAsHeader(HSSFSheet sheet, HSSFFormulaEvaluator evaluator, int rowNumber)
        {
            using (DataTable dt = new DataTable())
            {
                HSSFRow firstRow = sheet.GetRow(rowNumber-1) as HSSFRow;
                int cellCount = GetCellCount(sheet);

                for (int i = 0; i < cellCount; i++)
                {
                    if (firstRow.GetCell(i) != null)
                    {
                        //个别情况需要进行下面的设置，避免有的列为整型的取值会报异常，
                        firstRow.GetCell(i).SetCellType(CellType.STRING);
                        dt.Columns.Add(firstRow.GetCell(i).StringCellValue ?? string.Format("F{0}", i + 1), typeof(string));
                    }
                    else
                    {
                        dt.Columns.Add(string.Format("F{0}", i + 1), typeof(string));
                    }
                }

                for (int i = rowNumber; i <= sheet.LastRowNum; i++)
                {
                    HSSFRow row = sheet.GetRow(i) as HSSFRow;
                    DataRow dr = dt.NewRow();
                    FillDataRowByHSSFRow(row, evaluator, ref dr);
                    dt.Rows.Add(dr);
                }

                dt.TableName = sheet.SheetName;
                return dt;
            }
        }
        #endregion
    }
}

 

以上是修改的npoi的默认代码调用部分代码场景为

try
{
//遍历导入表返回dt
dt_FromNpoi = NOPIHelper.ExcelToDataTable(Server.MapPath("excelload") + "\\" + in_File.FileName, "租赁情况统计表",3);
}
catch (Exception)
{
Page.RegisterStartupScript("", "<script>alert('导入模板有错误，无法遍历导入模板数据到系统，请重新导入！')</script>");
this.In_Div.Visible = false;
}

其中的3为想要从哪行进行取值，并且将此列作为表头