Excel操作之 导出生成多个sheet页面

首先需要下载一个NPOI.dll  
下载地址：http://download.csdn.net/detail/president810/9503038

using System;
using System.Collections.Generic;
using System.IO;
//引用NPOI
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
namespace Sola.ExportTakeClass
{
public class ExportToExcelUtil
{
private string _excelPath = "";
private IWorkbook workbook;
private ISheet sheet;
private int row = 0;
private IList<string> sheetList = new List<string>();


public ExportToExcelUtil(string excelPath,IList<string> sheetList)
{
_excelPath = excelPath;
this.sheetList = sheetList;
ExcelFormat();
}
/// <summary>
/// 遍历sheet 并添加到excel
/// </summary>
private void ExcelFormat()
{
try
{
workbook = new HSSFWorkbook();
foreach (var sheetname in sheetList)
{
workbook.CreateSheet(sheetname);
}


}
catch
{
GC.Collect();
GC.Collect(1);
}
}
/// <summary>
/// 将头部列表添加至 指定的sheet页
/// </summary>
/// <param name="titleList"></param>
/// <param name="sheetName"></param>
public void SetHead(IList<string> titleList,string sheetName)
{
row = 0;
sheet = workbook.GetSheet(sheetName);
IRow headerRow = sheet.CreateRow(row);

int col = 0;
foreach (string t in titleList)
{
headerRow.CreateCell(col).SetCellValue(t);
col++;
}
}
/// <summary>
/// 将数据写入指定的 sheet页
/// </summary>
/// <param name="valueList"></param>
/// <param name="sheetName"></param>
public void WriteExcel(IList<string> valueList, string sheetName)
{
int col = 0;
sheet = workbook.GetSheet(sheetName);
row++;
IRow itemRow = sheet.CreateRow(row);
foreach (string v in valueList)
{
itemRow.CreateCell(col).SetCellValue(v);
col++;
}
}

public void Close()
{
try
{
FileStream file = new FileStream(_excelPath, FileMode.Create);
workbook.Write(file);
file.Close();
workbook.Clear();
}
finally
{
GC.Collect();
GC.Collect(1);
}
}
}
}