使用NPOI操作Excel(03、07)

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

namespace Common
{
public class ExcelHelper : IDisposable
{
private string fileName = null; //文件名
private IWorkbook workbook = null;
private FileStream fs = null;
private bool disposed;

public ExcelHelper(string fileName)
{
this.fileName = fileName;
disposed = false;
}
/// <summary>
/// 生成Sheet对象
/// </summary>
/// <param name="fileName">导出Excel文件完整文件名</param>
/// <param name="sheetName">要导入的excel的sheet的名称</param>
/// <returns></returns>
public ISheet GenerateSheet(string sheetName)
{
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();
if (workbook != null)
{
sheet = workbook.CreateSheet(sheetName);
}
return sheet;
}
/// <summary>
/// 将DataTable数据导入到excel中
/// </summary>
/// <param name="sheet">所要操作Excel的Sheet对象</param>
/// <param name="data">要导入的数据</param>
/// <param name="dataRowStart">数据起始行索引</param>
/// <returns>导入数据行数(包含列名那一行)</returns>
public int DataTableToExcel(ISheet sheet, DataTable data, int dataRowStart)
{
int i = 0;
int j = 0;
try
{
if (sheet != null)
{
for (i = 0; i < data.Rows.Count; ++i)
{
IRow row = sheet.CreateRow(dataRowStart);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
++dataRowStart;
}
workbook.Write(fs); //写入到excel
}
return dataRowStart;
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.Message);
return -1;
}
}

/// <summary>
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="sheetName">excel工作薄sheet的名称</param>
/// <param name="dataRowStart">数据起始行索引</param>
/// <returns>返回的DataTable</returns>
public DataTable ExcelToDataTable(DataTable tableModel, string sheetName, int dataRowStart)
{
ISheet sheet = null;
DataTable data = tableModel.Clone();
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);
if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
{
sheet = workbook.GetSheetAt(0);
}
}
else
{
sheet = workbook.GetSheetAt(0);
}
if (sheet != null)
{
IRow firstRow = sheet.GetRow(dataRowStart);
int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数
//最后一列的标号
int rowCount = sheet.LastRowNum;
for (int i = dataRowStart; 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>
/// 设置表头（支持单元格合并）
/// </summary>
/// <param name="sheet">要合并单元格所在的sheet</param>
/// <param name="mergeArrayList">需要进行单元格合并的单元格索引数组，数组长度为4，第一个为行起始位置，第二个为行结束为止，第三个为列起始位置，第四个为列结束为止</param>
/// <param name="valueList">单元格合并后值的集合，与合并单元格索引数组集合一一对应</param>
//public void SetCellRangeAddress(ISheet sheet, int rowstart, int rowend, int colstart, int colend, string value)
public void SetExcelHeader(ISheet sheet, IList<int[]> mergeArrayList, IList<string> valueList)
{
for (int m = 0; m < mergeArrayList.Count; m++)
{
if (mergeArrayList[m].Length > 4)
{
return;
}
int rowstart = mergeArrayList[m][0];
int rowend = mergeArrayList[m][1];
int colstart = mergeArrayList[m][2];
int colend = mergeArrayList[m][3];
string value = "";
if (m < valueList.Count)
{
value = valueList[m];
}
ICellStyle style = workbook.CreateCellStyle();
style.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.Boldweight = 700;
font.FontHeight = 20 * 20;
style.SetFont(font);
for (int i = rowstart; i < rowend + 1; i++)
{
IRow row = sheet.GetRow(i);
if (row==null)
{
row = sheet.CreateRow(i);
}
for (int j = colstart; j < colend + 1; j++)
{
ICell cell = row.CreateCell(j);
cell.SetCellValue(value);
cell.CellStyle = style;
}
}
if (rowend - rowstart > 0 || colend - colstart > 0)
{
CellRangeAddress cellRangeAddress = new CellRangeAddress(rowstart, rowend, colstart, colend);
sheet.AddMergedRegion(cellRangeAddress);
}
}
//workbook.Write(fs);
}

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;
}
}
}
}