使用NPOI 导入导出Excel的类

1. 整个Excel表格叫做工作表：WorkBook（工作薄），包含的叫页（工作表）：Sheet；行：Row；单元格Cell。

2. NPOI是POI项目的.NET版本，是由@Tony
Qu(http://tonyqus.cnblogs.com/)等大侠基于POI开发的，可以从http://npoi.codeplex.com/下载到它的最新版本。它不使用Office
COM组件(Microsoft.Office.Interop.XXX.dll)，不需要安装MicrosoftOffice，支持对Office
97-2003的文件格式，功能比较强大。更详细的说明请看官方网站。

（NPOI能够分析Excel文件的格式，能够进行常用Excel操作，不依赖于Excel，节省资源，没有安全性、性能的问题，在ASP.net中用最合适。只能处理xls格式文件、不能处理xlsx这样的新版本Excel文件格式。处理office
2007 以上版本用OpenXML。）

它有以下一些特性：

支持对标准的Excel读写

支持对流(Stream)的读写 (而Jet OLEDB和Office COM都只能针对文件)

支持大部分Office COM组件的常用功能

性能优异 (相对于前面的方法)

使用简单，易上手

使用NPOI

本文使用的版本是1.2.4，此版本的程序集缩减至2个：NPOI.dll、Ionic.Zip.dll，直接引用到项目中即可。

对于我们开发者使用的对象主要位于NPOI.HSSF.UserModel空间下，主要有HSSFWorkbook、HSSFSheet、HSSFRow、HSSFCell，对应的接口为位于NPOI.SS.UserModel空间下的IWorkbook、ISheet、IRow、ICell，分别对应Excel文件、工作表、行、列。

创建一个Workbook对象，添加一个工作表，在工作表中添加一行一列：

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;

public class NPOIWrite
{
void CreateSheet()
{
IWorkbook workbook = new HSSFWorkbook();//创建Workbook对象
ISheet sheet = workbook.CreateSheet("Sheet1");//创建工作表
IRow row = sheet.CreateRow(0);//在工作表中添加一行
ICell cell = row.CreateCell(0);//在行中添加一列
cell.SetCellValue("test");//设置列的内容
}
}

相应的读取代码：

using System.IO;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;

public class NPOIRead
{
void GetSheet(Stream stream)
{
IWorkbook workbook = new HSSFWorkbook(stream);//从流内容创建Workbook对象
ISheet sheet = workbook.GetSheetAt(0);//获取第一个工作表
IRow row = sheet.GetRow(0);//获取工作表第一行
ICell cell = row.GetCell(0);//获取行的第一列
string value = cell.ToString();//获取列的值
}
}

使用NPOI导入导出类

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text;
using System.Web;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.Record;//NPOI.HSSF.Record.Formula.Eval改为了NPOI.SS.Formula.Eval;
using NPOI.SS.Formula.Eval;//同上
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.POIFS;
using NPOI.SS.UserModel;
using NPOI.Util;
using NPOI.SS;
using NPOI.DDF;
using NPOI.SS.Util;
using System.Collections;
using System.Text.RegularExpressions;

namespace System
{
public class ExcelHelper
{
//private static WriteLog wl = new WriteLog();

#region DataTable转换成Excel文档流，并输出到客户端
/// <summary>
/// 自动设置Excel列宽
/// </summary>
/// <param name="sheet">Excel表</param>
private static void AutoSizeColumns(ISheet sheet)
{
if (sheet.PhysicalNumberOfRows > 0)
{
IRow headerRow = sheet.GetRow(0);

for (int i = 0, l = headerRow.LastCellNum; i < l; i++)
{
sheet.AutoSizeColumn(i);
}
}
}
/// <summary>
/// DataTable转换成Excel文档流，并输出到客户端
/// </summary>
/// <param name="table"></param>
/// <param name="response"></param>
/// <param name="fileName">输出的文件名</param>
public static void RenderToExcel(DataTable table, HttpContext context, string fileName, string sheetName)
{
using (MemoryStream ms = RenderToExcel(table, sheetName))
{
RenderToBrowser(ms, context, fileName);
}
}
/// <summary>
/// DataTable转换成Excel文档流
/// </summary>
/// <param name="table"></param>
/// <returns></returns>
public static MemoryStream RenderToExcel(DataTable table, string sheetName)
{
MemoryStream ms = new MemoryStream();

using (table)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.CreateSheet(sheetName) as HSSFSheet;
IRow headerRow = sheet.CreateRow(0);

// handling header.
foreach (DataColumn column in table.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//If Caption not set, returns the ColumnName value

// handling value.
int rowIndex = 1;

foreach (DataRow row in table.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);

foreach (DataColumn column in table.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
}

rowIndex++;
}
AutoSizeColumns(sheet);

workbook.Write(ms);
ms.Flush();
ms.Position = 0;
}
return ms;
}
/// <summary>
/// 输出文件到浏览器
/// </summary>
/// <param name="ms">Excel文档流</param>
/// <param name="context">HTTP上下文</param>
/// <param name="fileName">文件名</param>
private static void RenderToBrowser(MemoryStream ms, HttpContext context, string fileName)
{
if (context.Request.Browser.Browser == "IE")
fileName = HttpUtility.UrlEncode(fileName);
context.Response.AddHeader("Content-Disposition", "attachment;fileName=" + fileName);
context.Response.BinaryWrite(ms.ToArray());
}
#endregion

#region DataTable导出到Excel文件
/// <summary>
/// DataTable导出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
static MemoryStream ExportDT(DataTable dtSource, string strHeaderText)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.CreateSheet() as HSSFSheet;

#region 右击文件 属性信息

//{
//    DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
//    dsi.Company = "http://www.yongfa365.com/";
//    workbook.DocumentSummaryInformation = dsi;

//    SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
//    si.Author = "柳永法"; //填加xls文件作者信息
//    si.ApplicationName = "NPOI测试程序"; //填加xls文件创建程序信息
//    si.LastAuthor = "柳永法2"; //填加xls文件最后保存者信息
//    si.Comments = "说明信息"; //填加xls文件作者信息
//    si.Title = "NPOI测试"; //填加xls文件标题信息
//    si.Subject = "NPOI测试Demo"; //填加文件主题信息
//    si.CreateDateTime = DateTime.Now;
//    workbook.SummaryInformation = si;
//}

#endregion

HSSFCellStyle dateStyle = workbook.CreateCellStyle() as HSSFCellStyle;
HSSFDataFormat format = workbook.CreateDataFormat() as HSSFDataFormat;
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() as HSSFSheet;
}

#region 表头及样式

{
HSSFRow headerRow = sheet.CreateRow(0) as HSSFRow;
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(strHeaderText);

HSSFCellStyle headStyle = workbook.CreateCellStyle() as HSSFCellStyle;
headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.CENTER;
HSSFFont font = workbook.CreateFont() as HSSFFont;
font.FontHeightInPoints = 20;
font.Boldweight = 700;
headStyle.SetFont(font);

headerRow.GetCell(0).CellStyle = headStyle;

sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
//headerRow.Dispose();
}

#endregion

#region 列头及样式

{
HSSFRow headerRow = sheet.CreateRow(1) as HSSFRow;

HSSFCellStyle headStyle = workbook.CreateCellStyle() as HSSFCellStyle;
headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.CENTER;
HSSFFont font = workbook.CreateFont() as HSSFFont;
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);

}
//headerRow.Dispose();
}

#endregion

rowIndex = 2;
}

#endregion

#region 填充内容

HSSFRow dataRow = sheet.CreateRow(rowIndex) as HSSFRow;
foreach (DataColumn column in dtSource.Columns)
{
HSSFCell newCell = dataRow.CreateCell(column.Ordinal) as HSSFCell;

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

switch (column.DataType.ToString())
{
case "System.String": //字符串类型
double result;
if (isNumeric(drValue, out result))
{

double.TryParse(drValue, out result);
newCell.SetCellValue(result);
break;
}
else
{
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;

//sheet;
//workbook.Dispose();

return ms;
}
}

/// <summary>
/// DataTable导出到Excel文件
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">保存位置</param>
public static void ExportDTtoExcel(DataTable dtSource, string strHeaderText, string strFileName)
{
using (MemoryStream ms = ExportDT(dtSource, strHeaderText))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}
#endregion

#region 读取excel到datatable
/// <summary>
/// 读取excel
/// 默认第一行为标头
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
public static DataTable ImportExceltoDt(string strFileName)
{
DataTable dt = new DataTable();
HSSFWorkbook hssfworkbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = hssfworkbook.GetSheetAt(0) as HSSFSheet;
dt = ImportDt(sheet, 0, true);
return dt;
}

/// <summary>
/// 读取excel
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheet">需要导出的sheet</param>
/// <param name="HeaderRowIndex">列头所在行号，-1表示没有列头</param>
/// <returns></returns>
public static DataTable ImportExceltoDt(string strFileName, string SheetName, int HeaderRowIndex)
{
HSSFWorkbook workbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
workbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = workbook.GetSheet(SheetName) as HSSFSheet;
DataTable table = new DataTable();
table = ImportDt(sheet, HeaderRowIndex, true);
//ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}

/// <summary>
/// 读取excel
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheet">需要导出的sheet序号</param>
/// <param name="HeaderRowIndex">列头所在行号，-1表示没有列头</param>
/// <returns></returns>
public static DataTable ImportExceltoDt(string strFileName, int SheetIndex, int HeaderRowIndex)
{
HSSFWorkbook workbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
workbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = workbook.GetSheetAt(SheetIndex) as HSSFSheet;
DataTable table = new DataTable();
table = ImportDt(sheet, HeaderRowIndex, true);
//ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}

/// <summary>
/// 读取excel
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheet">需要导出的sheet</param>
/// <param name="HeaderRowIndex">列头所在行号，-1表示没有列头</param>
/// <returns></returns>
public static DataTable ImportExceltoDt(string strFileName, string SheetName, int HeaderRowIndex, bool needHeader)
{
HSSFWorkbook workbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
workbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = workbook.GetSheet(SheetName) as HSSFSheet;
DataTable table = new DataTable();
table = ImportDt(sheet, HeaderRowIndex, needHeader);
//ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}

/// <summary>
/// 读取excel
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheet">需要导出的sheet序号</param>
/// <param name="HeaderRowIndex">列头所在行号，-1表示没有列头</param>
/// <returns></returns>
public static DataTable ImportExceltoDt(string strFileName, int SheetIndex, int HeaderRowIndex, bool needHeader)
{
HSSFWorkbook workbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
workbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = workbook.GetSheetAt(SheetIndex) as HSSFSheet;
DataTable table = new DataTable();
table = ImportDt(sheet, HeaderRowIndex, needHeader);
//ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}

/// <summary>
/// 将制定sheet中的数据导出到datatable中
/// </summary>
/// <param name="sheet">需要导出的sheet</param>
/// <param name="HeaderRowIndex">列头所在行号，-1表示没有列头</param>
/// <returns></returns>
static DataTable ImportDt(HSSFSheet sheet, int HeaderRowIndex, bool needHeader)
{
DataTable table = new DataTable();
HSSFRow headerRow;
int cellCount;
try
{
if (HeaderRowIndex < 0 || !needHeader)
{
headerRow = sheet.GetRow(0) as HSSFRow;
cellCount = headerRow.LastCellNum;

for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
DataColumn column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}
}
else
{
headerRow = sheet.GetRow(HeaderRowIndex) as HSSFRow;
cellCount = headerRow.LastCellNum;

for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
if (headerRow.GetCell(i) == null)
{
if (table.Columns.IndexOf(Convert.ToString(i)) > 0)
{
DataColumn column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
{
DataColumn column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}

}
else if (table.Columns.IndexOf(headerRow.GetCell(i).ToString()) > 0)
{
DataColumn column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
{
DataColumn column = new DataColumn(headerRow.GetCell(i).ToString());
table.Columns.Add(column);
}
}
}
int rowCount = sheet.LastRowNum;
for (int i = (HeaderRowIndex + 1); i <= sheet.LastRowNum; i++)
{
try
{
HSSFRow row;
if (sheet.GetRow(i) == null)
{
row = sheet.CreateRow(i) as HSSFRow;
}
else
{
row = sheet.GetRow(i) as HSSFRow;
}

DataRow dataRow = table.NewRow();

for (int j = row.FirstCellNum; j <= cellCount; j++)
{
try
{
if (row.GetCell(j) != null)
{
switch (row.GetCell(j).CellType)
{
case CellType.STRING:
string str = row.GetCell(j).StringCellValue;
if (str != null && str.Length > 0)
{
dataRow[j] = str.ToString();
}
else
{
dataRow[j] = null;
}
break;
case CellType.NUMERIC:
if (DateUtil.IsCellDateFormatted(row.GetCell(j)))
{
dataRow[j] = DateTime.FromOADate(row.GetCell(j).NumericCellValue);
}
else
{
dataRow[j] = Convert.ToDouble(row.GetCell(j).NumericCellValue);
}
break;
case CellType.BOOLEAN:
dataRow[j] = Convert.ToString(row.GetCell(j).BooleanCellValue);
break;
case CellType.ERROR:
dataRow[j] = ErrorEval.GetText(row.GetCell(j).ErrorCellValue);
break;
case CellType.FORMULA:
switch (row.GetCell(j).CachedFormulaResultType)
{
case CellType.STRING:
string strFORMULA = row.GetCell(j).StringCellValue;
if (strFORMULA != null && strFORMULA.Length > 0)
{
dataRow[j] = strFORMULA.ToString();
}
else
{
dataRow[j] = null;
}
break;
case CellType.NUMERIC:
dataRow[j] = Convert.ToString(row.GetCell(j).NumericCellValue);
break;
case CellType.BOOLEAN:
dataRow[j] = Convert.ToString(row.GetCell(j).BooleanCellValue);
break;
case CellType.ERROR:
dataRow[j] = ErrorEval.GetText(row.GetCell(j).ErrorCellValue);
break;
default:
dataRow[j] = "";
break;
}
break;
default:
dataRow[j] = "";
break;
}
}
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
}
table.Rows.Add(dataRow);
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
}
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
return table;
}
#endregion

#region 更新excel中的数据
/// <summary>
/// 更新Excel表格
/// </summary>
/// <param name="outputFile">需更新的excel表格路径</param>
/// <param name="sheetname">sheet名</param>
/// <param name="updateData">需更新的数据</param>
/// <param name="coluid">需更新的列号</param>
/// <param name="rowid">需更新的开始行号</param>
public static void UpdateExcel(string outputFile, string sheetname, string[] updateData, int coluid, int rowid)
{
FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
ISheet sheet1 = hssfworkbook.GetSheet(sheetname);
for (int i = 0; i < updateData.Length; i++)
{
try
{
if (sheet1.GetRow(i + rowid) == null)
{
sheet1.CreateRow(i + rowid);
}
if (sheet1.GetRow(i + rowid).GetCell(coluid) == null)
{
sheet1.GetRow(i + rowid).CreateCell(coluid);
}

sheet1.GetRow(i + rowid).GetCell(coluid).SetCellValue(updateData[i]);
}
catch (Exception ex)
{
// wl.WriteLogs(ex.ToString());
throw;
}
}
try
{
readfile.Close();
FileStream writefile = new FileStream(outputFile, FileMode.Create, FileAccess.Write);
hssfworkbook.Write(writefile);
writefile.Close();
}
catch (Exception ex)
{
// wl.WriteLogs(ex.ToString());
}

}

/// <summary>
/// 更新Excel表格
/// </summary>
/// <param name="outputFile">需更新的excel表格路径</param>
/// <param name="sheetname">sheet名</param>
/// <param name="updateData">需更新的数据</param>
/// <param name="coluids">需更新的列号</param>
/// <param name="rowid">需更新的开始行号</param>
public static void UpdateExcel(string outputFile, string sheetname, string[][] updateData, int[] coluids, int rowid)
{
FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
readfile.Close();
ISheet sheet1 = hssfworkbook.GetSheet(sheetname);
for (int j = 0; j < coluids.Length; j++)
{
for (int i = 0; i < updateData[j].Length; i++)
{
try
{
if (sheet1.GetRow(i + rowid) == null)
{
sheet1.CreateRow(i + rowid);
}
if (sheet1.GetRow(i + rowid).GetCell(coluids[j]) == null)
{
sheet1.GetRow(i + rowid).CreateCell(coluids[j]);
}
sheet1.GetRow(i + rowid).GetCell(coluids[j]).SetCellValue(updateData[j][i]);
}
catch (Exception ex)
{
// wl.WriteLogs(ex.ToString());
}
}
}
try
{
FileStream writefile = new FileStream(outputFile, FileMode.Create);
hssfworkbook.Write(writefile);
writefile.Close();
}
catch (Exception ex)
{
//wl.WriteLogs(ex.ToString());
}
}

/// <summary>
/// 更新Excel表格
/// </summary>
/// <param name="outputFile">需更新的excel表格路径</param>
/// <param name="sheetname">sheet名</param>
/// <param name="updateData">需更新的数据</param>
/// <param name="coluid">需更新的列号</param>
/// <param name="rowid">需更新的开始行号</param>
public static void UpdateExcel(string outputFile, string sheetname, double[] updateData, int coluid, int rowid)
{
FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
ISheet sheet1 = hssfworkbook.GetSheet(sheetname);
for (int i = 0; i < updateData.Length; i++)
{
try
{
if (sheet1.GetRow(i + rowid) == null)
{
sheet1.CreateRow(i + rowid);
}
if (sheet1.GetRow(i + rowid).GetCell(coluid) == null)
{
sheet1.GetRow(i + rowid).CreateCell(coluid);
}

sheet1.GetRow(i + rowid).GetCell(coluid).SetCellValue(updateData[i]);
}
catch (Exception ex)
{
//wl.WriteLogs(ex.ToString());
throw;
}
}
try
{
readfile.Close();
FileStream writefile = new FileStream(outputFile, FileMode.Create, FileAccess.Write);
hssfworkbook.Write(writefile);
writefile.Close();
}
catch (Exception ex)
{
//wl.WriteLogs(ex.ToString());
}

}

/// <summary>
/// 更新Excel表格
/// </summary>
/// <param name="outputFile">需更新的excel表格路径</param>
/// <param name="sheetname">sheet名</param>
/// <param name="updateData">需更新的数据</param>
/// <param name="coluids">需更新的列号</param>
/// <param name="rowid">需更新的开始行号</param>
public static void UpdateExcel(string outputFile, string sheetname, double[][] updateData, int[] coluids, int rowid)
{
FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
readfile.Close();
ISheet sheet1 = hssfworkbook.GetSheet(sheetname);
for (int j = 0; j < coluids.Length; j++)
{
for (int i = 0; i < updateData[j].Length; i++)
{
try
{
if (sheet1.GetRow(i + rowid) == null)
{
sheet1.CreateRow(i + rowid);
}
if (sheet1.GetRow(i + rowid).GetCell(coluids[j]) == null)
{
sheet1.GetRow(i + rowid).CreateCell(coluids[j]);
}
sheet1.GetRow(i + rowid).GetCell(coluids[j]).SetCellValue(updateData[j][i]);
}
catch (Exception ex)
{
//wl.WriteLogs(ex.ToString());
}
}
}
try
{
FileStream writefile = new FileStream(outputFile, FileMode.Create);
hssfworkbook.Write(writefile);
writefile.Close();
}
catch (Exception ex)
{
//wl.WriteLogs(ex.ToString());
}
}

#endregion

public static int GetSheetNumber(string outputFile)
{
int number = 0;
try
{
FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
number = hssfworkbook.NumberOfSheets;

}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
return number;
}

public static ArrayList GetSheetName(string outputFile)
{
ArrayList arrayList = new ArrayList();
try
{
FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
for (int i = 0; i < hssfworkbook.NumberOfSheets; i++)
{
arrayList.Add(hssfworkbook.GetSheetName(i));
}
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
return arrayList;
}

public static bool isNumeric(String message, out double result)
{
Regex rex = new Regex(@"^[-]?\d+[.]?\d*$");
result = -1;
if (rex.IsMatch(message))
{
result = double.Parse(message);
return true;
}
else
return false;
}
}
}

使用例子导出：

protected void btDownload_Click(object sender, EventArgs e)
{
PatientNursingMonitor dal = new PatientNursingMonitor();
DataTable dt = dal.GetTable("");
if (dt != null && dt.Rows.Count > 0)
{
DataTable dtExcel = new DataTable();
dtExcel.Columns.Add(new DataColumn("监控时间", typeof(DateTime)));
dtExcel.Columns.Add(new DataColumn("评分", typeof(string)));
foreach (DataRow dr in dt.Rows)
{
DataRow row = dtExcel.NewRow();
row["监控时间"] = dr["MonitorDate"].ToString();
row["评分"] = dr["Score"].ToString();
dtExcel.Rows.Add(row);
}

HttpContext context = HttpContext.Current;
string excelName = DateTime.Now.ToString("yyyyMMddHHmm") + "xxx.xls";

//ExcelHelper.ExportDTtoExcel(dtDDJKJL, null, "c:\\" + excelName);
ExcelHelper.RenderToExcel(dtExcel, context, excelName, "sheet1");
}
else
{
lbMsg.Items.Add("暂无记录");
}
}

使用例子导入

protected void btInsertYP_Click(object sender, EventArgs e)
{
string path = Server.MapPath("/files/YPM.xls");
DataTable dt = ExcelHelper.ImportExceltoDt(path, 0, -1);
Drug dal = new Drug();
for (int i = 0; i < dt.Rows.Count; i++)
{
DrugInfo info = new DrugInfo();
info.DrugName = dt.Rows[i][2].ToString();//药品名称
info.DrugType = dt.Rows[i][5].ToString();//药品类别
info.Unit = dt.Rows[i][4].ToString();//单位
if (dal.Insert(info) > 0)
{
}
}
}