asp.net中利用NPOI匯出資料到excel中

asp.net中利用NPOI實現匯出DataSet到Excel中，首先下載對應的dll，下載地址：http://download.csdn.net/detail/taomanman/8865699

將其新增到專案引用中。

下面給出一個方法NPOIHelper.cs，程式碼如下：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.IO;
using System.Reflection;
using System.Text;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;
using NPOI.SS.Util;
using NPOI.POIFS;
using NPOI.Util;
using NPOI.HSSF.Util;
using NPOI.XSSF.UserModel;

/// <summary>
///NPOIHelper 的摘要說明
/// </summary>
public class NPOIHelper
{
    #region 由DataSet、DataTable匯出Excel
    /// <summary>
    /// 由DataSet匯出Excel,被外界呼叫的方法
    /// </summary>   
    /// <param name="sourceTable">要匯出資料的DataTable</param>
    /// <param name="fileName">指定Excel工作表名稱</param>
    /// <param name="fileName">strType=0:普通格式 1有格式化的形式</param>
    /// <returns>Excel工作表</returns>    
    public static void ExportDataSetToExcel(DataSet sourceDs, string fileName, string sheetName, string strType)
    {
        MemoryStream ms = null;
        if (strType == "0")
        {
            ms = ExportDataSetToBasicExcel(sourceDs, sheetName) as MemoryStream;
        }
        else
        {
            ms = ExportDataSetToFormatExcel(sourceDs, sheetName) as MemoryStream;
        }
        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8) + ".xls");
        HttpContext.Current.Response.BinaryWrite(ms.ToArray());
        HttpContext.Current.Response.End();
        ms.Close();
        ms = null;
    }

    /// <summary>
    /// 由DataSet匯出Excel(基本形式)
    /// </summary>
    /// <param name="sourceTable">要匯出資料的DataTable</param>    
    /// <param name="sheetName">工作表名稱</param>
    /// <returns>Excel工作表</returns>    
    private static Stream ExportDataSetToBasicExcel(DataSet sourceDs, string sheetName)
    {
        HSSFWorkbook workbook = new HSSFWorkbook();
        MemoryStream ms = new MemoryStream();
        string[] sheetNames = sheetName.Split(new string[] { ";" }, StringSplitOptions.RemoveEmptyEntries); //分割符
        for (int i = 0; i < sheetNames.Length; i++)
        {
            HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet(sheetNames[i]);

            // handling value.            
            int rowIndex = 0;
            int sheetnum = 1;
            foreach (DataRow row in sourceDs.Tables[i].Rows)
            {
                #region 建立表頭
                if (rowIndex == 65535 || rowIndex == 0)
                {
                    if (rowIndex != 0)
                    {
                        sheetnum++;
                        sheet = (HSSFSheet)workbook.CreateSheet(sheetNames[i] + "-" + sheetnum.ToString());
                    }
                    var headerRow = sheet.CreateRow(0);
                    var headStyle = workbook.CreateCellStyle();
                    headStyle.Alignment = HorizontalAlignment.CENTER;
                    var font = workbook.CreateFont();
                    font.FontHeightInPoints = 10;
                    font.Boldweight = 700;
                    headStyle.SetFont(font);
                    foreach (DataColumn column in sourceDs.Tables[i].Columns)
                        headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                    rowIndex = 1;
                }
                #endregion

                #region 建立內容
                HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
                foreach (DataColumn column in sourceDs.Tables[i].Columns)
                {
                    dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
                }
                rowIndex++;
                #endregion
            }
        }
        workbook.Write(ms);
        ms.Flush();
        ms.Position = 0;
        workbook = null;
        return ms;
    }

    /// <summary>
    /// 由DataSet匯出Excel(帶有格式)
    /// </summary>
    /// <param name="sourceTable">要匯出資料的DataTable</param>    
    /// <param name="sheetName">工作表名稱</param>
    /// <returns>Excel工作表</returns>
    private static Stream ExportDataSetToFormatExcel(DataSet sourceDs, string sheetName)
    {
        HSSFWorkbook workbook = new HSSFWorkbook();
        MemoryStream ms = new MemoryStream();
        string[] sheetNames = sheetName.Split(new string[] { ";" }, StringSplitOptions.RemoveEmptyEntries); //分割符
        for (int i = 0; i < sheetNames.Length; i++)
        {
            HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet(sheetNames[i]);


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

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

            int rowIndex = 0;
            int sheetnum = 1;
            foreach (DataRow row in sourceDs.Tables[i].Rows)
            {
                #region 建立表頭
                if (rowIndex == 65535 || rowIndex == 0)
                {
                    if (rowIndex != 0)
                    {
                        sheetnum++;
                        sheet = (HSSFSheet)workbook.CreateSheet(sheetNames[i] + "-" + sheetnum.ToString());
                    }
                    var headerRow = sheet.CreateRow(0);
                    var headStyle = workbook.CreateCellStyle();
                    headStyle.Alignment = HorizontalAlignment.CENTER;
                    var font = workbook.CreateFont();
                    font.FontHeightInPoints = 10;
                    font.Boldweight = 700;
                    headStyle.SetFont(font);

                    //設定邊框
                    headStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.THIN;
                    headStyle.BottomBorderColor = HSSFColor.BLACK.index;
                    headStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.THIN;
                    headStyle.LeftBorderColor = HSSFColor.GREEN.index;
                    headStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.THIN;
                    headStyle.RightBorderColor = HSSFColor.BLUE.index;
                    headStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.THIN;
                    headStyle.TopBorderColor = HSSFColor.ORANGE.index;
                   //設定背景色
                    headStyle.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.LIME.index;
                    headStyle.FillPattern = NPOI.SS.UserModel.FillPatternType.BIG_SPOTS;
                    headStyle.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.LIGHT_GREEN.index;

                    foreach (DataColumn column in sourceDs.Tables[i].Columns)
                    {
                        headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                        headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
                        //設定列寬  
                        sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                    }
                    rowIndex = 1;
                }
                #endregion

                #region 建立內容
                var dataRow = sheet.CreateRow(rowIndex);
                foreach (DataColumn column in sourceDs.Tables[i].Columns)
                {
                    var newCell = dataRow.CreateCell(column.Ordinal);

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

                    switch (column.DataType.ToString())
                    {
                        case "System.String"://字串型別  
                            newCell.SetCellValue(drValue);
                            break;
                        case "System.DateTime"://日期型別  
                        case "MySql.Data.Types.MySqlDateTime": //MySql型別
                            if (drValue == "0000/0/0 0:00:00" || String.IsNullOrEmpty(drValue))
                            {
                                //當時間為空，防止生成的execl 中是一串“#######”號，所有賦值為空字串
                                newCell.SetCellValue("");
                            }
                            else
                            {
                                DateTime dateV;
                                DateTime.TryParse(drValue, out dateV);
                                newCell.SetCellValue(dateV);
                                newCell.CellStyle = dateStyle;//格式化顯示  
                            }
                            break;
                        case "System.Boolean"://布林型  
                            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"://浮點型  
                        case "System.Double":
                            double doubV = 0;
                            double.TryParse(drValue, out doubV);
                            newCell.SetCellValue(doubV);
                            break;
                        case "System.DBNull"://空值處理  
                            newCell.SetCellValue("");
                            break;
                        default:
                            newCell.SetCellValue("");
                            break;
                    }
                }
                #endregion
                rowIndex++;
            }
            //設定首行首列凍結
            //第一個參數列示要凍結的列數
            //第二個參數列示要凍結的行數
            //第三個參數列示右邊區域可見的首列序號，從1開始計算
            //第四個參數列示下邊區域可見的首行序號，也是從1開始計算
            sheet.CreateFreezePane(1, 1, 0, 10);
        }
        workbook.Write(ms);
        ms.Flush();
        ms.Position = 0;
        workbook = null;
        return ms;
    }
    /// <summary>
    /// 由DataTable匯出Excel,基本方法
    /// </summary>
    /// <param name="sourceTable">要匯出資料的DataTable</param> 
    /// <returns>Excel工作表</returns>    
    private static Stream ExportDataTableToBasicExcel(DataTable sourceTable, string sheetName)
    {
        HSSFWorkbook workbook = new HSSFWorkbook();
        MemoryStream ms = new MemoryStream();
        var sheet = workbook.CreateSheet(sheetName);

        int rowIndex = 0;
        int sheetnum = 1;
        foreach (DataRow row in sourceTable.Rows)
        {
            #region 建立表頭
            if (rowIndex == 65535 || rowIndex == 0)
            {
                if (rowIndex != 0)
                {
                    sheetnum++;
                    sheet = workbook.CreateSheet(sheetName + "-" + sheetnum.ToString());
                }
                var headerRow = sheet.CreateRow(0);
                var headStyle = workbook.CreateCellStyle();
                headStyle.Alignment = HorizontalAlignment.CENTER;
                var font = workbook.CreateFont();
                font.FontHeightInPoints = 10;
                font.Boldweight = 700;
                headStyle.SetFont(font);
                foreach (DataColumn column in sourceTable.Columns)
                    headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                rowIndex = 1;
            }
            #endregion

            HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
            foreach (DataColumn column in sourceTable.Columns)
            {
                dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
            }
            rowIndex++;
        }
        workbook.Write(ms);
        ms.Flush();
        ms.Position = 0;
        sheet = null;
        workbook = null;
        return ms;
    }


    /// <summary>
    /// 帶格式化的
    /// </summary>
    /// <param name="dtSource">資料來源</param>
    /// <param name="sheetName">建立的Sheet名稱</param>
    /// <returns></returns>
    private static Stream ExportDataTableToFormatExcel(DataTable dtSource, string sheetName)
    {
        HSSFWorkbook workbook = new HSSFWorkbook();
        var sheet = workbook.CreateSheet(sheetName);

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

        //取得列寬  
        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;

        int sheetnum = 1;

        foreach (DataRow row in dtSource.Rows)
        {
            #region 新建表，填充表頭，填充列頭，樣式
            if (rowIndex == 65535 || rowIndex == 0)
            {
                if (rowIndex != 0)
                {
                    sheetnum++;
                    sheet = workbook.CreateSheet(sheetName + "-" + sheetnum.ToString());
                }

                #region 列頭及樣式
                {
                    var headerRow = sheet.CreateRow(0);
                    var headStyle = workbook.CreateCellStyle();
                    headStyle.Alignment = HorizontalAlignment.CENTER;
                    var font = workbook.CreateFont();
                    font.FontHeightInPoints = 10;
                    font.Boldweight = 700;
                    headStyle.SetFont(font);
                    //設定背景色
                    headStyle.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.WHITE.index;
                    headStyle.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.RED.index;


                    foreach (DataColumn column in dtSource.Columns)
                    {
                        headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                        headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
                        //設定列寬  
                        sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                    }
                }
                #endregion
                rowIndex = 1;
            }
            #endregion


            #region 填充內容
            var dataRow = sheet.CreateRow(rowIndex);
            foreach (DataColumn column in dtSource.Columns)
            {
                var newCell = dataRow.CreateCell(column.Ordinal);

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

                switch (column.DataType.ToString())
                {
                    case "System.String"://字串型別  
                        newCell.SetCellValue(drValue);
                        break;
                    case "System.DateTime"://日期型別  
                    case "MySql.Data.Types.MySqlDateTime": //MySql型別
                        if (drValue == "0000/0/0 0:00:00" || String.IsNullOrEmpty(drValue))
                        {
                            //當時間為空，防止生成的execl 中是一串“#######”號，所有賦值為空字串
                            newCell.SetCellValue("");
                        }
                        else
                        {
                            DateTime dateV;
                            DateTime.TryParse(drValue, out dateV);
                            newCell.SetCellValue(dateV);

                            newCell.CellStyle = dateStyle;//格式化顯示  
                        }
                        break;
                    case "System.Boolean"://布林型  
                        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"://浮點型  
                    case "System.Double":
                        double doubV = 0;
                        double.TryParse(drValue, out doubV);
                        newCell.SetCellValue(doubV);
                        break;
                    case "System.DBNull"://空值處理  
                        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>
    /// 由DataTable匯出Excel
    /// </summary>
    /// <param name="sourceTable">要匯出資料的DataTable</param>
    /// <param name="fileName">指定Excel工作表名稱</param>
    /// <param name="sheetName">指定Sheet名稱</param>
    /// <param name="strType">strType=0:基本的，1：帶有格式的</param>
    /// <returns>Excel工作表</returns>
    public static void ExportDataTableToExcel(DataTable sourceTable, string fileName, string sheetName, string strType)
    {
        MemoryStream ms = null;
        if (strType == "0")
        {
            ms = ExportDataTableToBasicExcel(sourceTable, sheetName) as MemoryStream;
        }
        else
        {
            ms = ExportDataTableToFormatExcel(sourceTable, sheetName) as MemoryStream;
        }

        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8) + ".xls");
        HttpContext.Current.Response.BinaryWrite(ms.ToArray());
        HttpContext.Current.Response.End();
        ms.Close();
        ms = null;
    }

    /// <summary>
    /// 由DataTable匯出Excel(適應於基本的模版匯出，且不超過65535條)
    /// </summary>
    /// <param name="sourceTable">要匯出資料的DataTable</param>
    /// <param name="modelpath">模版檔案實體路徑</param>
    /// <param name="modelName">模版檔名稱</param>
    /// <param name="fileName">指定Excel工作表名稱</param>
    /// <param name="sheetName">作為模型的Excel</param>
    /// <param name="rowindex">從第幾行開始寫入資料(此為行索引，若為1則從第2行開始寫入資料)</param>
    /// <returns>Excel工作表</returns>
    public static void ExportDataTableToExcelModel(DataTable sourceTable, string modelpath, string modelName, string fileName, string sheetName, int rowIndex)
    {
        int colIndex = 0;
        FileStream file = new FileStream(modelpath + "/" + modelName, FileMode.Open, FileAccess.Read);//讀入excel模板
        HSSFWorkbook hssfworkbook = new HSSFWorkbook(file);
        HSSFSheet sheet1 = (HSSFSheet)hssfworkbook.GetSheet(sheetName);
        if (sourceTable.Rows.Count + rowIndex > 65535)
        {
            throw new ArgumentException("資料太多，系統尚不支援，請縮小查詢範圍!");
        }

        foreach (DataRow row in sourceTable.Rows)
        {   //雙迴圈寫入sourceTable中的資料
            colIndex = 0;
            HSSFRow xlsrow = (HSSFRow)sheet1.CreateRow(rowIndex);
            foreach (DataColumn col in sourceTable.Columns)
            {
                xlsrow.CreateCell(colIndex).SetCellValue(row[col.ColumnName].ToString());
                colIndex++;
            }
            rowIndex++;
        }
        sheet1.ForceFormulaRecalculation = true;

        //CS專案適用胡方法
        //FileStream fileS = new FileStream(modelpath + fileName + ".xls", FileMode.Create);//儲存
        //hssfworkbook.Write(fileS);
        //fileS.Close();
        MemoryStream ms = new MemoryStream();
        hssfworkbook.Write(ms);

        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8) + ".xls");
        HttpContext.Current.Response.BinaryWrite(ms.ToArray());
        HttpContext.Current.Response.End();
        ms.Close();
        ms = null;
    } 
    #endregion

    #region 從Excel中讀資料到DataTable
    /// <summary>
    /// 從Excel中獲取資料到DataTable
    /// </summary>
    /// <param name="strFileName">Excel檔案全路徑(伺服器路徑)</param>
    /// <param name="extension">Excel檔案的副檔名</param>
    /// <param name="SheetName">要獲取資料的工作表名稱</param>
    /// <param name="HeaderRowIndex">工作表標題行所在行號(從0開始)</param>
    /// <returns></returns>
    public static DataTable RenderDataTableFromExcel(string strFileName, string extension, string SheetName, int HeaderRowIndex)
    {
        using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
        {
            IWorkbook workbook = null;
            if (extension.Equals(".xls") || extension.Equals(".XLS"))
            {
                workbook = new HSSFWorkbook(file);
            }
            else
            {
                workbook = new XSSFWorkbook(file);
            }
            return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex);
        }
    }

    /// <summary>
    /// 從Excel中獲取資料到DataTable
    /// </summary>
    /// <param name="strFileName">Excel檔案全路徑(伺服器路徑)</param>
    /// <param name="extension">Excel檔案的副檔名</param>
    /// <param name="SheetIndex">要獲取資料的工作表序號(從0開始)</param>
    /// <param name="HeaderRowIndex">工作表標題行所在行號(從0開始)</param>
    /// <returns></returns>
    public static DataTable RenderDataTableFromExcel(string strFileName, string extension, int SheetIndex, int HeaderRowIndex)
    {
        using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
        {
            IWorkbook workbook = null;
            if (extension.Equals(".xls") || extension.Equals(".XLS"))
            {
                workbook = new HSSFWorkbook(file);
            }
            else
            {
                workbook = new XSSFWorkbook(file);
            }

            string SheetName = workbook.GetSheetName(SheetIndex);
            return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex);
        }
    }

    /// <summary>
    /// 從Excel中獲取資料到DataTable
    /// </summary>
    /// <param name="ExcelFileStream">Excel檔案流</param>
    /// <param name="SheetName">要獲取資料的工作表名稱</param>
    /// <param name="HeaderRowIndex">工作表標題行所在行號(從0開始)</param>
    /// <returns></returns>
    public static DataTable RenderDataTableFromExcel(Stream ExcelFileStream, string SheetName, int HeaderRowIndex)
    {
        IWorkbook workbook = new HSSFWorkbook(ExcelFileStream);
        ExcelFileStream.Close();
        return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex);
    }

    /// <summary>
    /// 從Excel中獲取資料到DataTable
    /// </summary>
    /// <param name="ExcelFileStream">Excel檔案流</param>
    /// <param name="SheetIndex">要獲取資料的工作表序號(從0開始)</param>
    /// <param name="HeaderRowIndex">工作表標題行所在行號(從0開始)</param>
    /// <returns></returns>
    public static DataTable RenderDataTableFromExcel(Stream ExcelFileStream, int SheetIndex, int HeaderRowIndex)
    {
        IWorkbook workbook = new HSSFWorkbook(ExcelFileStream);
        ExcelFileStream.Close();
        string SheetName = workbook.GetSheetName(SheetIndex);
        return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex);
    }

    /// <summary>
    /// 從Excel中獲取資料到DataTable
    /// </summary>
    /// <param name="workbook">要處理的工作薄</param>
    /// <param name="SheetName">要獲取資料的工作表名稱</param>
    /// <param name="HeaderRowIndex">工作表標題行所在行號(從0開始)</param>
    /// <returns></returns>
    public static DataTable RenderDataTableFromExcel(IWorkbook workbook, string SheetName, int HeaderRowIndex)
    {
        ISheet sheet = workbook.GetSheet(SheetName);
        DataTable table = new DataTable();
        try
        {
            IRow headerRow = sheet.GetRow(HeaderRowIndex);
            int cellCount = headerRow.LastCellNum;

            for (int i = headerRow.FirstCellNum; i < cellCount; i++)
            {
                DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
                table.Columns.Add(column);
            }

            int rowCount = sheet.LastRowNum;

            #region 迴圈各行各列,寫入資料到DataTable
            for (int i = (sheet.FirstRowNum + 1); i < sheet.LastRowNum; i++)
            {
                IRow row = sheet.GetRow(i);
                DataRow dataRow = table.NewRow();
                for (int j = row.FirstCellNum; j < cellCount; j++)
                {
                    ICell cell = row.GetCell(j);
                    if (cell == null)
                    {
                        dataRow[j] = null;
                    }
                    else
                    {
                        switch (cell.CellType)
                        {
                            case CellType.BLANK:
                                dataRow[j] = null;
                                break;
                            case CellType.BOOLEAN:
                                dataRow[j] = cell.BooleanCellValue;
                                break;
                            case CellType.NUMERIC:
                                dataRow[j] = cell.ToString();
                                break;
                            case CellType.STRING:
                                dataRow[j] = cell.StringCellValue;
                                break;
                            case CellType.ERROR:
                                dataRow[j] = cell.ErrorCellValue;
                                break;
                            case CellType.FORMULA:
                            default:
                                dataRow[j] = "=" + cell.CellFormula;
                                break;
                        }
                    }
                }
                table.Rows.Add(dataRow);
                //dataRow[j] = row.GetCell(j).ToString();
            }
            #endregion
        }
        catch (System.Exception ex)
        {
            table.Clear();
            table.Columns.Clear();
            table.Columns.Add("出錯了");
            DataRow dr = table.NewRow();
            dr[0] = ex.Message;
            table.Rows.Add(dr);
            return table;
        }
        finally
        {
            //sheet.Dispose();
            workbook = null;
            sheet = null;
        }
        #region 清除最後的空行
        for (int i = table.Rows.Count - 1; i > 0; i--)
        {
            bool isnull = true;
            for (int j = 0; j < table.Columns.Count; j++)
            {
                if (table.Rows[i][j] != null)
                {
                    if (table.Rows[i][j].ToString() != "")
                    {
                        isnull = false;
                        break;
                    }
                }
            }
            if (isnull)
            {
                table.Rows[i].Delete();
            }
        }
        #endregion
        return table;
    }
    #endregion
}

aspx頁面中某個按鈕的點選事件程式碼如下呼叫：

DataSet ds = XXXX(); //用於獲取資料庫資料
NPOIHelper.ExportDataSetToExcel(ds, "統計報表" + DateTime.Now.ToString("yyyyMMddHHmmss"), "統計表", "0");