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asp.net 利用NPOI导出Excel通用类的方法

解决中文文件名保存Excel乱码问题,主要是判断火狐或者IE浏览器,然后做对应的判断处理,核心代码如下: System.Web.HttpConte...

解决中文文件名保存Excel乱码问题,主要是判断火狐或者IE浏览器,然后做对应的判断处理,核心代码如下:

 System.Web.HttpContext.Current.Response.ContentType = "application/vnd.ms-excel"; 
 //设置下载的Excel文件名 
 if (System.Web.HttpContext.Current.Request.ServerVariables["http_user_agent"].ToString().IndexOf("Firefox") != -1) 
 { 
    //火狐浏览器    
    System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", "=?UTF-8?B?" + Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(fileName)) + "?=")); 
} 
else 
{ 
    //IE等浏览器 
    System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", System.Web.HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8))); 
} 

废话不多说,直接上类库代码,ATNPOIHelper.cs:

using System; 
using System.Linq; 
using System.Web; 
using System.IO; 
using NPOI; 
using NPOI.SS.Util; 
using NPOI.HSSF.Util; 
using NPOI.SS.UserModel; 
using NPOI.HSSF.UserModel; 
using System.Data; 
using System.Collections.Generic; 
using System.Text; 
 
namespace AT.Utility.DotNetFile 
{ 
  /* 
  导出Excel包含的功能: 
  1.多表头导出最多支持到三行,表头格式说明 
  相邻父列头之间用‘#‘分隔,父列头与子列头用空格(‘ ‘)分隔,相邻子列头用逗号分隔(‘,‘) 
  两行:序号#分公司#组别#本日成功签约单数 预警,续约,流失,合计#累计成功签约单数 预警,续约,流失,合计#任务数#完成比例#排名 
  三行:等级#级别#上期结存 件数,重量,比例#本期调入 收购调入 件数,重量,比例#本期发出 车间投料 件数,重量,比例#本期发出 产品外销百分比 件数,重量,比例#平均值 
  三行时请注意:列头要重复 
  2.添加表头标题功能 
  3.添加序号功能 
  4.根据数据设置列宽 
 
  缺陷: 
  数据内容不能合并列合并行 
 
  改进思路: 
  添加一属性:设置要合并的列,为了实现多列合并可以这样设置{“列1,列2”,”列4”} 
    */ 
  /// <summary> 
  /// 利用NPOI实现导出Excel 
  /// </summary> 
  public class ATNPOIHelper 
  { 
 
    #region 初始化 
 
    /// <summary> 
    /// 声明 HSSFWorkbook 对象 
    /// </summary> 
    private static HSSFWorkbook _workbook; 
 
    /// <summary> 
    /// 声明 HSSFSheet 对象 
    /// </summary> 
    private static HSSFSheet _sheet; 
 
    #endregion 
 
    #region Excel导出 
 
    /// <summary> 
    /// Excel导出 
    /// </summary> 
    /// <param name="fileName">文件名称 如果为空或NULL,则默认“新建Excel.xls”</param> 
    /// <param name="list"></param> 
    /// <param name="ColMergeNum">合计:末行合计时,合并的列数</param> 
    /// <param name="method">导出方式 1:WEB导出(默认)2:按文件路径导出</param> 
    /// <param name="filePath">文件路径 如果WEB导出,则可以为空;如果按文件路径导出,则默认桌面路径</param> 
    public static void Export(string fileName, IList<NPOIModel> list, int ColMergeNum, int method = 1, string filePath = null) 
    { 
      // 文件名称 
      if (!string.IsNullOrEmpty(fileName)) 
      { 
        if (fileName.IndexOf(‘.‘) == -1) 
        { 
          fileName += ".xls"; 
        } 
        else 
        { 
          fileName = fileName.Substring(1, fileName.IndexOf(‘.‘)) + ".xls"; 
        } 
      } 
      else 
      { 
        fileName = "新建Excel.xls"; 
      } 
      // 文件路径 
      if (2 == method && string.IsNullOrEmpty(filePath)) 
      { 
        filePath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop); 
      } 
      // 调用导出处理程序 
      Export(list, ColMergeNum); 
      // WEB导出 
      if (1 == method) 
      { 
        System.Web.HttpContext.Current.Response.ContentType = "application/vnd.ms-excel"; 
        //设置下载的Excel文件名 
        if (System.Web.HttpContext.Current.Request.ServerVariables["http_user_agent"].ToString().IndexOf("Firefox") != -1) 
        { 
          //火狐浏览器    
          System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", "=?UTF-8?B?" + Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(fileName)) + "?=")); 
        } 
        else 
        { 
          //IE等浏览器 
          System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", System.Web.HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8))); 
        } 
        using (MemoryStream ms = new MemoryStream()) 
        { 
          //将工作簿的内容放到内存流中 
          _workbook.Write(ms); 
          //将内存流转换成字节数组发送到客户端 
          System.Web.HttpContext.Current.Response.BinaryWrite(ms.GetBuffer()); 
          System.Web.HttpContext.Current.Response.End(); 
          _sheet = null; 
          _workbook = null; 
        } 
      } 
      else if (2 == method) 
      { 
        using (FileStream fs = File.Open(filePath, FileMode.Append)) 
        { 
          _workbook.Write(fs); 
          _sheet = null; 
          _workbook = null; 
        } 
      } 
    } 
 
    /// <summary> 
    /// 导出方法实现 
    /// </summary> 
    /// <param name="list"></param> 
    private static void Export(IList<NPOIModel> list, int ColMergeNum) 
    { 
 
      #region 变量声明 
 
      // 初始化 
      _workbook = new HSSFWorkbook(); 
      // 声明 Row 对象 
      IRow _row; 
      // 声明 Cell 对象 
      ICell _cell; 
      // 总列数 
      int cols = 0; 
      // 总行数 
      int rows = 0; 
      // 行数计数器 
      int rowIndex = 0; 
      // 单元格值 
      string drValue = null; 
 
      #endregion 
 
      foreach (NPOIModel model in list) 
      { 
        // 工作薄命名 
        if (model.sheetName != null) 
          _sheet = (HSSFSheet)_workbook.CreateSheet(model.sheetName); 
        else 
          _sheet = (HSSFSheet)_workbook.CreateSheet(); 
 
        // 获取数据源 
        DataTable dt = model.dataSource; 
        // 初始化 
        rowIndex = 0; 
        // 获取总行数 
        rows = GetRowCount(model.headerName); 
        // 获取总列数 
        cols = GetColCount(model.headerName); 
 
        //合计:合并表格末行N列,rows为表头行数,dt.Rows.Count为数据行数 
        if (ColMergeNum > 1) 
        { 
          CellRangeAddress region_Merge = new CellRangeAddress(rows + dt.Rows.Count, rows + dt.Rows.Count, 0, ColMergeNum - 1); 
          _sheet.AddMergedRegion(region_Merge); 
        } 
 
        ICellStyle myBodyStyle = bodyStyle; 
        ICellStyle myTitleStyle = titleStyle; 
        ICellStyle myDateStyle = dateStyle; 
        ICellStyle myBodyRightStyle = bodyRightStyle; 
        // 循环行数 
        foreach (DataRow row in dt.Rows) 
        { 
 
          #region 新建表,填充表头,填充列头,样式 
 
          if (rowIndex == 65535 || rowIndex == 0) 
          { 
            if (rowIndex != 0) 
              _sheet = (HSSFSheet)_workbook.CreateSheet(); 
 
            // 构建行 
            for (int i = 0; i < rows + model.isTitle; i++) 
            { 
              _row = _sheet.GetRow(i); 
              // 创建行 
              if (_row == null) 
                _row = _sheet.CreateRow(i); 
 
              for (int j = 0; j < cols; j++) 
                _row.CreateCell(j).CellStyle = myBodyStyle; 
            } 
 
            // 如果存在表标题 
            if (model.isTitle > 0) 
            { 
              // 获取行 
              _row = _sheet.GetRow(0); 
              // 合并单元格 
              CellRangeAddress region = new CellRangeAddress(0, 0, 0, (cols - 1)); 
              _sheet.AddMergedRegion(region); 
              // 填充值 
              _row.CreateCell(0).SetCellValue(model.tableTitle); 
              // 设置样式 
              _row.GetCell(0).CellStyle = myTitleStyle; 
              // 设置行高 
              _row.HeightInPoints = 20; 
            } 
 
            // 取得上一个实体 
            NPOIHeader lastRow = null; 
            IList<NPOIHeader> hList = GetHeaders(model.headerName, rows, model.isTitle); 
            // 创建表头 
            foreach (NPOIHeader m in hList) 
            { 
              var data = hList.Where(c => c.firstRow == m.firstRow && c.lastCol == m.firstCol - 1); 
              if (data.Count() > 0) 
              { 
                lastRow = data.First(); 
                if (m.headerName == lastRow.headerName) 
                  m.firstCol = lastRow.firstCol; 
              } 
 
              // 获取行 
              _row = _sheet.GetRow(m.firstRow); 
              // 合并单元格 
              CellRangeAddress region = new CellRangeAddress(m.firstRow, m.lastRow, m.firstCol, m.lastCol); 
 
              _sheet.AddMergedRegion(region); 
              // 填充值 
              _row.CreateCell(m.firstCol).SetCellValue(m.headerName); 
            } 
            // 填充表头样式 
            for (int i = 0; i < rows + model.isTitle; i++) 
            { 
              _row = _sheet.GetRow(i); 
              for (int j = 0; j < cols; j++) 
              { 
                _row.GetCell(j).CellStyle = myBodyStyle; 
                //设置列宽 
                _sheet.SetColumnWidth(j, (model.colWidths[j] + 1) * 450); 
              } 
            } 
 
            rowIndex = (rows + model.isTitle); 
          } 
 
          #endregion 
 
          #region 填充内容 
 
          // 构建列 
          _row = _sheet.CreateRow(rowIndex); 
          foreach (DataColumn column in dt.Columns) 
          { 
            // 添加序号列 
            if (1 == model.isOrderby && column.Ordinal == 0) 
            { 
              _cell = _row.CreateCell(0); 
              _cell.SetCellValue(rowIndex - rows); 
              _cell.CellStyle = myBodyStyle; 
            } 
 
            // 创建列 
            _cell = _row.CreateCell(column.Ordinal + model.isOrderby); 
 
            // 获取值 
            drValue = row[column].ToString(); 
 
            switch (column.DataType.ToString()) 
            { 
              case "System.String"://字符串类型 
                _cell.SetCellValue(drValue); 
                _cell.CellStyle = myBodyStyle; 
                break; 
              case "System.DateTime"://日期类型 
                DateTime dateV; 
                DateTime.TryParse(drValue, out dateV); 
                _cell.SetCellValue(dateV); 
 
                _cell.CellStyle = myDateStyle;//格式化显示 
                break; 
              case "System.Boolean"://布尔型 
                bool boolV = false; 
                bool.TryParse(drValue, out boolV); 
                _cell.SetCellValue(boolV); 
                _cell.CellStyle = myBodyStyle; 
                break; 
              case "System.Int16"://整型 
              case "System.Int32": 
              case "System.Int64": 
              case "System.Byte": 
                int intV = 0; 
                int.TryParse(drValue, out intV); 
                _cell.SetCellValue(intV); 
                _cell.CellStyle = myBodyRightStyle; 
                break; 
              case "System.Decimal"://浮点型 
              case "System.Double": 
                double doubV = 0; 
                double.TryParse(drValue, out doubV); 
                _cell.SetCellValue(doubV.ToString("f2")); 
                _cell.CellStyle = myBodyRightStyle; 
                break; 
              case "System.DBNull"://空值处理 
                _cell.SetCellValue(""); 
                break; 
              default: 
                _cell.SetCellValue(""); 
                break; 
            } 
 
          } 
 
          #endregion 
 
          rowIndex++; 
        } 
      } 
    } 
 
    #region 辅助方法 
 
    /// <summary> 
    /// 表头解析 
    /// </summary> 
    /// <remarks> 
    /// </remarks> 
    /// <param name="header">表头</param> 
    /// <param name="rows">总行数</param> 
    /// <param name="addRows">外加行</param> 
    /// <param name="addCols">外加列</param> 
    /// <returns></returns> 
    private static IList<NPOIHeader> GetHeaders(string header, int rows, int addRows) 
    { 
      // 临时表头数组 
      string[] tempHeader; 
      string[] tempHeader2; 
      // 所跨列数 
      int colSpan = 0; 
      // 所跨行数 
      int rowSpan = 0; 
      // 单元格对象 
      NPOIHeader model = null; 
      // 行数计数器 
      int rowIndex = 0; 
      // 列数计数器 
      int colIndex = 0; 
      //  
      IList<NPOIHeader> list = new List<NPOIHeader>(); 
      // 初步解析 
      string[] headers = header.Split(new string[] { "#" }, StringSplitOptions.RemoveEmptyEntries); 
      // 表头遍历 
      for (int i = 0; i < headers.Length; i++) 
      { 
        // 行数计数器清零 
        rowIndex = 0; 
        // 列数计数器清零 
        colIndex = 0; 
        // 获取所跨行数 
        rowSpan = GetRowSpan(headers[i], rows); 
        // 获取所跨列数 
        colSpan = GetColSpan(headers[i]); 
 
        // 如果所跨行数与总行数相等,则不考虑是否合并单元格问题 
        if (rows == rowSpan) 
        { 
          colIndex = GetMaxCol(list); 
          model = new NPOIHeader(headers[i], 
            addRows, 
            (rowSpan - 1 + addRows), 
            colIndex, 
            (colSpan - 1 + colIndex), 
            addRows); 
          list.Add(model); 
          rowIndex += (rowSpan - 1) + addRows; 
        } 
        else 
        { 
          // 列索引 
          colIndex = GetMaxCol(list); 
          // 如果所跨行数不相等,则考虑是否包含多行 
          tempHeader = headers[i].Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries); 
          for (int j = 0; j < tempHeader.Length; j++) 
          { 
 
            // 如果总行数=数组长度 
            if (1 == GetColSpan(tempHeader[j])) 
            { 
              if (j == tempHeader.Length - 1 && tempHeader.Length < rows) 
              { 
                model = new NPOIHeader(tempHeader[j], 
                  (j + addRows), 
                  (j + addRows) + (rows - tempHeader.Length), 
                  colIndex, 
                  (colIndex + colSpan - 1), 
                  addRows); 
                list.Add(model); 
              } 
              else 
              { 
                model = new NPOIHeader(tempHeader[j], 
                    (j + addRows), 
                    (j + addRows), 
                    colIndex, 
                    (colIndex + colSpan - 1), 
                    addRows); 
                list.Add(model); 
              } 
            } 
            else 
            { 
              // 如果所跨列数不相等,则考虑是否包含多列 
              tempHeader2 = tempHeader[j].Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries); 
              for (int m = 0; m < tempHeader2.Length; m++) 
              { 
                // 列索引 
                colIndex = GetMaxCol(list) - colSpan + m; 
                if (j == tempHeader.Length - 1 && tempHeader.Length < rows) 
                { 
                  model = new NPOIHeader(tempHeader2[m], 
                    (j + addRows), 
                    (j + addRows) + (rows - tempHeader.Length), 
                    colIndex, 
                    colIndex, 
                    addRows); 
                  list.Add(model); 
                } 
                else 
                { 
                  model = new NPOIHeader(tempHeader2[m], 
                      (j + addRows), 
                      (j + addRows), 
                      colIndex, 
                      colIndex, 
                      addRows); 
                  list.Add(model); 
                } 
              } 
            } 
            rowIndex += j + addRows; 
          } 
        } 
      } 
      return list; 
    } 
 
    /// <summary> 
    /// 获取最大列 
    /// </summary> 
    /// <param name="list"></param> 
    /// <returns></returns> 
    private static int GetMaxCol(IList<NPOIHeader> list) 
    { 
      int maxCol = 0; 
      if (list.Count > 0) 
      { 
        foreach (NPOIHeader model in list) 
        { 
          if (maxCol < model.lastCol) 
            maxCol = model.lastCol; 
        } 
        maxCol += 1; 
      } 
 
      return maxCol; 
    } 
 
    /// <summary> 
    /// 获取表头行数 
    /// </summary> 
    /// <param name="newHeaders">表头文字</param> 
    /// <returns></returns> 
    private static int GetRowCount(string newHeaders) 
    { 
      string[] ColumnNames = newHeaders.Split(new char[] { ‘@‘ }); 
      int Count = 0; 
      if (ColumnNames.Length <= 1) 
        ColumnNames = newHeaders.Split(new char[] { ‘#‘ }); 
      foreach (string name in ColumnNames) 
      { 
        int TempCount = name.Split(new char[] { ‘ ‘ }).Length; 
        if (TempCount > Count) 
          Count = TempCount; 
      } 
      return Count; 
    } 
 
    /// <summary> 
    /// 获取表头列数 
    /// </summary> 
    /// <param name="newHeaders">表头文字</param> 
    /// <returns></returns> 
    private static int GetColCount(string newHeaders) 
    { 
      string[] ColumnNames = newHeaders.Split(new char[] { ‘@‘ }); 
      int Count = 0; 
      if (ColumnNames.Length <= 1) 
        ColumnNames = newHeaders.Split(new char[] { ‘#‘ }); 
      Count = ColumnNames.Length; 
      foreach (string name in ColumnNames) 
      { 
        int TempCount = name.Split(new char[] { ‘,‘ }).Length; 
        if (TempCount > 1) 
          Count += TempCount - 1; 
      } 
      return Count; 
    } 
 
    /// <summary> 
    /// 列头跨列数 
    /// </summary> 
    /// <remarks> 
    /// </remarks> 
    /// <param name="newHeaders">表头文字</param> 
    /// <returns></returns> 
    private static int GetColSpan(string newHeaders) 
    { 
      return newHeaders.Split(‘,‘).Count(); 
    } 
 
    /// <summary> 
    /// 列头跨行数 
    /// </summary>  
    /// <remarks> 
    /// </remarks> 
    /// <param name="newHeaders">列头文本</param> 
    /// <param name="rows">表头总行数</param> 
    /// <returns></returns> 
    private static int GetRowSpan(string newHeaders, int rows) 
    { 
      int Count = newHeaders.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries).Length; 
      // 如果总行数与当前表头所拥有行数相等 
      if (rows == Count) 
        Count = 1; 
      else if (Count < rows) 
        Count = 1 + (rows - Count); 
      else 
        throw new Exception("表头格式不正确!"); 
      return Count; 
    } 
 
    #endregion 
 
    #region 单元格样式 
 
    /// <summary> 
    /// 数据单元格样式 
    /// </summary> 
    private static ICellStyle bodyStyle 
    { 
      get 
      { 
        ICellStyle style = _workbook.CreateCellStyle(); 
        style.Alignment = HorizontalAlignment.CENTER; //居中 
        style.VerticalAlignment = VerticalAlignment.CENTER;//垂直居中  
        style.WrapText = true;//自动换行 
        // 边框 
        style.BorderBottom = BorderStyle.THIN; 
        style.BorderLeft = BorderStyle.THIN; 
        style.BorderRight = BorderStyle.THIN; 
        style.BorderTop = BorderStyle.THIN; 
        // 字体 
        //IFont font = _workbook.CreateFont(); 
        //font.FontHeightInPoints = 10; 
        //font.FontName = "宋体"; 
        //style.SetFont(font); 
 
        return style; 
      } 
    } 
 
    /// <summary> 
    /// 数据单元格样式 
    /// </summary> 
    private static ICellStyle bodyRightStyle 
    { 
      get 
      { 
        ICellStyle style = _workbook.CreateCellStyle(); 
        style.Alignment = HorizontalAlignment.RIGHT; //居中 
        style.VerticalAlignment = VerticalAlignment.CENTER;//垂直居中  
        style.WrapText = true;//自动换行 
        // 边框 
        style.BorderBottom = BorderStyle.THIN; 
        style.BorderLeft = BorderStyle.THIN; 
        style.BorderRight = BorderStyle.THIN; 
        style.BorderTop = BorderStyle.THIN; 
        // 字体 
        //IFont font = _workbook.CreateFont(); 
        //font.FontHeightInPoints = 10; 
        //font.FontName = "宋体"; 
        //style.SetFont(font); 
 
        return style; 
      } 
    } 
 
    /// <summary> 
    /// 标题单元格样式 
    /// </summary> 
    private static ICellStyle titleStyle 
    { 
      get 
      { 
        ICellStyle style = _workbook.CreateCellStyle(); 
        style.Alignment = HorizontalAlignment.CENTER; //居中 
        style.VerticalAlignment = VerticalAlignment.CENTER;//垂直居中  
        style.WrapText = true;//自动换行  
 
        //IFont font = _workbook.CreateFont(); 
        //font.FontHeightInPoints = 14; 
        //font.FontName = "宋体"; 
        //font.Boldweight = (short)FontBoldWeight.BOLD; 
        //style.SetFont(font); 
 
        return style; 
      } 
    } 
 
    /// <summary> 
    /// 日期单元格样式 
    /// </summary> 
    private static ICellStyle dateStyle 
    { 
      get 
      { 
        ICellStyle style = _workbook.CreateCellStyle(); 
        style.Alignment = HorizontalAlignment.CENTER; //居中 
        style.VerticalAlignment = VerticalAlignment.CENTER;//垂直居中  
        style.WrapText = true;//自动换行 
        // 边框 
        style.BorderBottom = BorderStyle.THIN; 
        style.BorderLeft = BorderStyle.THIN; 
        style.BorderRight = BorderStyle.THIN; 
        style.BorderTop = BorderStyle.THIN; 
        // 字体 
        //IFont font = _workbook.CreateFont(); 
        //font.FontHeightInPoints = 10; 
        //font.FontName = "宋体"; 
        //style.SetFont(font); 
 
        IDataFormat format = _workbook.CreateDataFormat(); 
        style.DataFormat = format.GetFormat("yyyy-MM-dd"); 
        return style; 
      } 
    } 
 
    #endregion 
 
    #endregion 
  } 
 
  /// <summary> 
  /// 实体类 
  /// </summary> 
  public class NPOIModel 
  { 
    /// <summary> 
    /// 数据源 
    /// </summary> 
    public DataTable dataSource { get; private set; } 
    /// <summary> 
    /// 要导出的数据列数组 
    /// </summary> 
    public string[] fileds { get; private set; } 
    /// <summary> 
    /// 工作薄名称数组 
    /// </summary> 
    public string sheetName { get; private set; } 
    /// <summary> 
    /// 表标题 
    /// </summary> 
    public string tableTitle { get; private set; } 
    /// <summary> 
    /// 表标题是否存在 1:存在 0:不存在 
    /// </summary> 
    public int isTitle { get; private set; } 
    /// <summary> 
    /// 是否添加序号 
    /// </summary> 
    public int isOrderby { get; private set; } 
    /// <summary> 
    /// 表头 
    /// </summary> 
    public string headerName { get; private set; } 
    /// <summary> 
    /// 取得列宽 
    /// </summary> 
    public int[] colWidths { get; private set; } 
    /// <summary> 
    /// 构造函数 
    /// </summary> 
    /// <remarks> 
    /// </remarks> 
    /// <param name="dataSource">数据来源 DataTable</param> 
    /// <param name="filed">要导出的字段,如果为空或NULL,则默认全部</param>  
    /// <param name="sheetName">工作薄名称</param> 
    /// <param name="headerName">表头名称 如果为空或NULL,则默认数据列字段 
    /// 相邻父列头之间用‘#‘分隔,父列头与子列头用空格(‘ ‘)分隔,相邻子列头用逗号分隔(‘,‘) 
    /// 两行:序号#分公司#组别#本日成功签约单数 预警,续约,流失,合计#累计成功签约单数 预警,续约,流失,合计#任务数#完成比例#排名  
    /// 三行:等级#级别#上期结存 件数,重量,比例#本期调入 收购调入 件数,重量,比例#本期发出 车间投料 件数,重量,比例#本期发出 产品外销百分比 件数,重量,比例#平均值  
    /// 三行时请注意:列头要重复 
    /// </param> 
    /// <param name="tableTitle">表标题</param>  
    /// <param name="isOrderby">是否添加序号 0:不添加 1:添加</param> 
    public NPOIModel(DataTable dataSource, string filed, string sheetName, string headerName, string tableTitle = null, int isOrderby = 0) 
    { 
      if (!string.IsNullOrEmpty(filed)) 
      { 
        this.fileds = filed.ToUpper().Split(new string[] { ";" }, StringSplitOptions.RemoveEmptyEntries); 
 
        // 移除多余数据列 
        for (int i = dataSource.Columns.Count - 1; i >= 0; i--) 
        { 
          DataColumn dc = dataSource.Columns[i]; 
          if (!this.fileds.Contains(dataSource.Columns[i].Caption.ToUpper())) 
          { 
            dataSource.Columns.Remove(dataSource.Columns[i]); 
          } 
        } 
 
        // 列索引 
        int colIndex = 0; 
        // 循环排序 
        for (int i = 0; i < dataSource.Columns.Count; i++) 
        { 
          // 获取索引 
          colIndex = GetColIndex(dataSource.Columns[i].Caption.ToUpper()); 
          // 设置下标 
          dataSource.Columns[i].SetOrdinal(colIndex); 
        } 
      } 
      else 
      { 
        this.fileds = new string[dataSource.Columns.Count]; 
        for (int i = 0; i < dataSource.Columns.Count; i++) 
        { 
          this.fileds[i] = dataSource.Columns[i].ColumnName; 
        } 
      } 
      this.dataSource = dataSource; 
 
      if (!string.IsNullOrEmpty(sheetName)) 
      { 
        this.sheetName = sheetName; 
      } 
      if (!string.IsNullOrEmpty(headerName)) 
      { 
        this.headerName = headerName; 
      } 
      else 
      { 
        this.headerName = string.Join("#", this.fileds); 
      } 
      if (!string.IsNullOrEmpty(tableTitle)) 
      { 
        this.tableTitle = tableTitle; 
        this.isTitle = 1; 
      } 
      // 取得数据列宽 数据列宽可以和表头列宽比较,采取最长宽度  
      colWidths = new int[this.dataSource.Columns.Count]; 
      foreach (DataColumn item in this.dataSource.Columns) 
      { 
        colWidths[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length; 
      } 
      // 循环比较最大宽度 
      for (int i = 0; i < this.dataSource.Rows.Count; i++) 
      { 
        for (int j = 0; j < this.dataSource.Columns.Count; j++) 
        { 
          int intTemp = Encoding.GetEncoding(936).GetBytes(this.dataSource.Rows[i][j].ToString()).Length; 
          if (intTemp > colWidths[j]) 
          { 
            colWidths[j] = intTemp; 
          } 
        } 
      } 
      if (isOrderby > 0) 
      { 
        this.isOrderby = isOrderby; 
        this.headerName = "序号#" + this.headerName; 
      } 
    } 
 
    /// <summary> 
    /// 获取列名下标 
    /// </summary> 
    /// <param name="colName">列名称</param> 
    /// <returns></returns> 
    private int GetColIndex(string colName) 
    { 
      for (int i = 0; i < this.fileds.Length; i++) 
      { 
        if (colName == this.fileds[i]) 
          return i; 
      } 
      return 0; 
    } 
  } 
 
  /// <summary> 
  /// 表头构建类 
  /// </summary> 
  public class NPOIHeader 
  { 
    /// <summary> 
    /// 表头 
    /// </summary> 
    public string headerName { get; set; } 
    /// <summary> 
    /// 起始行 
    /// </summary> 
    public int firstRow { get; set; } 
    /// <summary> 
    /// 结束行 
    /// </summary> 
    public int lastRow { get; set; } 
    /// <summary> 
    /// 起始列 
    /// </summary> 
    public int firstCol { get; set; } 
    /// <summary> 
    /// 结束列 
    /// </summary> 
    public int lastCol { get; set; } 
    /// <summary> 
    /// 是否跨行 
    /// </summary> 
    public int isRowSpan { get; private set; } 
    /// <summary> 
    /// 是否跨列 
    /// </summary> 
    public int isColSpan { get; private set; } 
    /// <summary> 
    /// 外加行 
    /// </summary> 
    public int rows { get; set; } 
 
    public NPOIHeader() { } 
    /// <summary> 
    /// 构造函数 
    /// </summary> 
    /// <param name="headerName">表头</param> 
    /// <param name="firstRow">起始行</param> 
    /// <param name="lastRow">结束行</param> 
    /// <param name="firstCol">起始列</param> 
    /// <param name="lastCol">结束列</param> 
    /// <param name="rows">外加行</param> 
    /// <param name="cols">外加列</param> 
    public NPOIHeader(string headerName, int firstRow, int lastRow, int firstCol, int lastCol, int rows = 0) 
    { 
      this.headerName = headerName; 
      this.firstRow = firstRow; 
      this.lastRow = lastRow; 
      this.firstCol = firstCol; 
      this.lastCol = lastCol; 
      // 是否跨行判断 
      if (firstRow != lastRow) 
        isRowSpan = 1; 
      if (firstCol != lastCol) 
        isColSpan = 1; 
 
      this.rows = rows; 
    } 
  } 
} 

3、导出代码示例如下:

/// <summary> 
/// 导出测点列表表格 
/// </summary> 
[HttpGet] 
[AllowAnonymous] 
public void ExportMeasurePointData(string TreeID, string TreeType) 
{ 
  DataTable dtResult = new DataTable(); 
  DataTable dtExcel = new DataTable(); 
  try 
  { 
    string sql = string.Format("EXEC P_GET_ZXJG_TagList ‘{0}‘,‘{1}‘", TreeID, TreeType); 
    dtResult = QuerySQL.GetDataTable(sql); 
    dtExcel = dtResult.Copy(); 
    dtExcel.Columns.Add("xuhao", typeof(string)); 
    dtExcel.Columns.Add("StrValueTime", typeof(string)); 
    dtExcel.Columns["xuhao"].SetOrdinal(0); 
    dtExcel.Columns["StrValueTime"].SetOrdinal(2); 
    for (int i = 0; i < dtResult.Rows.Count; i++) 
    { 
      dtExcel.Rows[i]["xuhao"] = (i + 1).ToString(); 
      dtExcel.Rows[i]["StrValueTime"] = Convert.ToDateTime(dtResult.Rows[i]["F_ValueTime"]).ToString("yyyy-MM-dd HH:mm:ss"); 
    } 
    List<NPOIModel> list = new List<NPOIModel>(); 
    list.Add(new NPOIModel(dtExcel, "xuhao;F_Description;StrValueTime;F_Value;F_Unit;F_AlmLow;F_AlmUp", "sheet", "序号#监测点#采集时间#当前数值#工程单位#报警下限#报警上限")); 
    ATNPOIHelper.Export("测点列表", list, 0); 
  } 
  catch (Exception ex) 
  { 
 
  } 
}