/// <summary>
    /// 导出数据到本地
    /// </summary>
    /// <param name="dt">要导出的数据</param>
    /// <param name="tableName">导出名称</param>
    /// <param name="tableTitle">表格行名格式“账号，密码”</param>
    /// <param name="response">请求</param>
    public static void OutFileToDisk(DataTable dt, string tableName, string tableTitle, HttpResponse response)
    {
      Workbook workbook = new Workbook(); //工作簿 
      Worksheet sheet = workbook.Worksheets[0]; //工作表 
      Cells cells = sheet.Cells;//单元格 

      //为标题设置样式   
      Style styleTitle = workbook.Styles[workbook.Styles.Add()];//新增样式 
      styleTitle.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
      styleTitle.Font.Name = "宋体";//文字字体 
      styleTitle.Font.Size = 18;//文字大小 
      styleTitle.Font.IsBold = true;//粗体 

      //样式2 
      Style style2 = workbook.Styles[workbook.Styles.Add()];//新增样式 
      style2.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
      style2.Font.Name = "宋体";//文字字体 
      style2.Font.Size = 14;//文字大小 
      style2.Font.IsBold = true;//粗体 
      style2.IsTextWrapped = true;//单元格内容自动换行 
      style2.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;
      style2.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;
      style2.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;
      style2.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;

      //样式3 
      Style style3 = workbook.Styles[workbook.Styles.Add()];//新增样式 
      style3.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
      style3.Font.Name = "宋体";//文字字体 
      style3.Font.Size = 12;//文字大小 
      style3.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;
      style3.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;
      style3.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;
      style3.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;

      int Colnum = dt.Columns.Count;//表格列数 
      int Rownum = dt.Rows.Count;//表格行数 

      //生成行1 标题行  
      cells.Merge(0, 0, 1, Colnum);//合并单元格 
      cells[0, 0].PutValue(tableName);//填写内容 
      cells[0, 0].SetStyle(styleTitle);
      cells.SetRowHeight(0, 38);

      //生成行2 列名行 
      string[] Tile = tableTitle.Split(',');
      for (int i = 0; i < Colnum; i++)
      {
        cells[1, i].PutValue(Tile[i]);
        cells[1, i].SetStyle(style2);
        cells.SetRowHeight(1, 25);
      }

      //生成数据行 
      for (int i = 0; i < Rownum; i++)
      {
        for (int k = 0; k < Colnum; k++)
        {
          cells[2 + i, k].PutValue(dt.Rows[i][k].ToString());
          cells[2 + i, k].SetStyle(style3);
        }
        cells.SetRowHeight(2 + i, 24);
      }
      workbook.Save(response, HttpUtility.UrlEncode(tableName, System.Text.Encoding.UTF8) + ".xls", ContentDisposition.Attachment, new XlsSaveOptions(SaveFormat.Excel97To2003));
    }

string tableTitle = "账号，密码";
    ExcelHelp.OutFileToDisk(dt, "账户信息", tableTitle , HttpContext.Current.Response);

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