NPOI 读写excel 支持2003/2007

/**
*
NPOI 2.0将OOXML的代码放在了单独的DLL中，使用前请确保引用了以下DLL
NPOI.dll
NPOI.OOXML.dll
NPOI.OpenXml4Net.dll
NPOI.OpenXmlFormats.dll

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的C#版本，NPOI的行和列的index都是从0开始
3、POI读取Excel有两种格式一个是HSSF，另一个是XSSF。 HSSF和XSSF的区别如下：
HSSF is the POI Project's pure Java implementation of the Excel '97(-2007) file format.
XSSF is the POI Project's pure Java implementation of the Excel 2007 OOXML (.xlsx) file format.
即：HSSF适用2007以前的版本,XSSF适用2007版本及其以上的。
*/

/***
* 实现了2003，及2007的导入与导出
*/

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;

namespace TcpClient
{
class ExcelHelper:IDisposable
{
private IWorkbook workbook = null;
private FileStream fs = null;
private bool disposed;

#region
public ExcelHelper()
{
disposed = false;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!this.disposed)
{
if (disposing)
{
if (fs != null)
fs.Close();
}

fs = null;
disposed = true;
}
}
#endregion

#region
/// <summary>
/// 将DataTable数据导入到excel中
/// </summary>
/// <param name="fileName">excel文件路径</param>
/// <param name="data">要导入的数据</param>
/// <param name="isColumnWritten">DataTable的列名是否要导入</param>
/// <param name="sheetName">要导入的excel的sheet的名称</param>
/// <returns>导入数据行数(包含列名那一行)</returns>
public int DataTableToExcel(string fileName,DataTable data, string sheetName, bool isColumnWritten)
{
int i = 0;
int j = 0;
int count = 0;
ISheet sheet = null;

fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
if (fileName.IndexOf(".xlsx") > 0) // 2007版本
workbook = new XSSFWorkbook();
else if (fileName.IndexOf(".xls") > 0) // 2003版本
workbook = new HSSFWorkbook();

try
{
if (workbook != null)
{
sheet = workbook.CreateSheet(sheetName);
}
else
{
return -1;
}

if (isColumnWritten == true) //写入DataTable的列名
{
IRow row = sheet.CreateRow(0);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
}
count = 1;
}
else
{
count = 0;
}

for (i = 0; i < data.Rows.Count; ++i)
{
IRow row = sheet.CreateRow(count);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
++count;
}
workbook.Write(fs); //写入到excel
return count;
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.Message);
return -1;
}
}

/// <summary>
/// 将DataTable数据导入到excel中:Sheet默认名称为“Sheet1”;DataTable的列名称作为excel的列名称
/// </summary>
/// <param name="fileName"></param>
/// <param name="data"></param>
/// <returns></returns>
public int DataTableToExcel(string fileName, DataTable data)
{
return DataTableToExcel(fileName,data,"Sheet1",true);
}

/// <summary>
/// 将DataTable数据导入到excel中保存在内存当中
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public MemoryStream DataTableToExcel(DataTable data)
{
int i = 0;
int j = 0;
int count = 0;
ISheet sheet = null;

int dataRowscount = data.Rows.Count;
if (dataRowscount > 65536) // 2007版本
workbook = new XSSFWorkbook();
else // 2003版本
workbook = new HSSFWorkbook();

try
{
if (workbook != null)
{
sheet = workbook.CreateSheet("Sheet1");
}

//DataTable的列名作为excel列名写入
IRow rowColumn = sheet.CreateRow(0);
for (j = 0; j < data.Columns.Count; ++j)
{
rowColumn.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
}
count = 1;

//DataTable数据写入
for (i = 0; i < data.Rows.Count; ++i)
{
IRow row = sheet.CreateRow(count);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
++count;
}

using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;

return ms;
}
}
catch (Exception ex)
{
throw ex;
}

}

#endregion

//用于web导出，需要进行功能测试(20200411)
//public void ExportByWeb(DataTable data, string fileName)
//{
// System.Web.HttpContext curContext = System.Web.HttpContext.Current;
// // 设置编码和附件格式
// //curContext.Response.ContentType = "application/vnd.ms-excel";
// curContext.Response.ContentType = "application/ms-excel";

// curContext.Response.ContentEncoding = Encoding.UTF8;
// curContext.Response.Charset = "";
// curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=\"" + HttpUtility.UrlEncode(strFileName, System.Text.Encoding.UTF8) + "\"");
// //curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));
// curContext.Response.BinaryWrite(DataTableToExcel(data).GetBuffer());
//}

#region EXCEL导入到DataTable
/// <summary>
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="fileName">excel文件路径</param>
/// <param name="sheetName">excel工作薄sheet的名称</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
/// <returns>返回的DataTable</returns>
public DataTable ExcelToDataTable(string fileName, string sheetName, bool isFirstRowColumn)
{
ISheet sheet = null;
DataTable data = new DataTable();
int startRow = 0;
try
{
fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
if (fileName.IndexOf(".xlsx") > 0) // 2007版本
workbook = new XSSFWorkbook(fs);
else if (fileName.IndexOf(".xls") > 0) // 2003版本
workbook = new HSSFWorkbook(fs);

if (sheetName != null)
{
sheet = workbook.GetSheet(sheetName);
}
else
{
sheet = workbook.GetSheetAt(0);
}
if (sheet != null)
{
IRow firstRow = sheet.GetRow(0);
int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号即总的列数

if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
DataColumn column = new DataColumn(firstRow.GetCell(i).StringCellValue);
data.Columns.Add(column);
}
startRow = sheet.FirstRowNum + 1;
}
else
{
startRow = sheet.FirstRowNum;
}

//最后一列的标号
int rowCount = sheet.LastRowNum;
for (int i = startRow; i <= rowCount; ++i)
{
IRow row = sheet.GetRow(i);
if (row == null) continue; //没有数据的行默认是null　　　　　　　

DataRow dataRow = data.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
dataRow[j] = row.GetCell(j).ToString();
}
data.Rows.Add(dataRow);
}
}

return data;
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.Message);
return null;
}
}

/// <summary>
/// 将excel中的数据导入到DataTable中:默认读取第一个Sheet页,表格第一行为DataTable的列名称
/// </summary>
/// <param name="fileName">excel文件路径</param>
/// <returns></returns>
public DataTable ExcelToDataTable(string fileName)
{
return ExcelToDataTable(fileName,null,true);
}

#endregion

}

}

NPOI 读写excel 支持2003/2007

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