asp.net 利用NPOI导出Excel通用类

最新推荐文章于 2025-05-28 09:16:59 发布

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最新推荐文章于 2025-05-28 09:16:59 发布

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本文介绍了解决中文文件名保存Excel时出现乱码的问题，通过判断浏览器类型（火狐或IE）来采取不同的处理策略。同时提供了一个类库ATNPOIHelper.cs，用于利用NPOI实现导出Excel，并支持多表头、表头标题等功能。

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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)
{
}
}