一个简易的控制台程序，使用C#+NPOI进行Excel处理，实现多个Excel文件的求和统计。
前提：
- 待统计的Excel格式相同
- 统计结果表与待统计的表格格式一致
引入如下四个动态库：
1. NPOI.dll
2. NPOI.OOXML.dll
3. NPOI.OpenXml4Net.dll
4. NPOI.OpenXmlFormats.dll
csharp
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.IO;
namespace excelMergeCal
{
class Program
{
static String BaseDIir = "d:\\docs";
static String ResultFile = "d:\\result.xlsx";
static int startRow = 5;
static int endRow = 72;
static int startColumn = 3;
static int endColumn = 67;
static List<CellWithPos> AllCells = new List<CellWithPos>();
static void Main(string[] args)
{
Console.WriteLine("********************************************************************************");
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("* 1.将待处理的Excel放在D盘的docs文件夹下****************************************");
Console.WriteLine("* 2.将待处理的一个文件的全部数据单元格清空后放在D盘根目录下，命名为result.xlsx *");
Console.WriteLine("* 3.关闭打开的excel文件 ********************************************************");
Console.WriteLine("* 4.按下回车键(Enter)开始*******************************************************");
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine("********************************************************************************");
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("等待按下回车键(Enter)开始...");
Console.ForegroundColor = ConsoleColor.White;
Console.ReadLine();
ReadAllExcel();
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("处理完成，按回车键(Enter)关闭.");
Console.ReadLine();
}
static void ReadAllExcel()
{
string[] files = Directory.GetFiles(BaseDIir, "*.*", SearchOption.AllDirectories);
foreach (string file in files)
{
Console.WriteLine("正在处理文件：" + file);
if (!file.EndsWith("xlsx") && !file.EndsWith("xls"))
{
Console.WriteLine("文件 " + file + " 不是xlsx/xls后缀，已忽略.....");
continue;
}
ReadExcel(file);
// 处理每个文件
}
WriteResult();
}
static CellWithPos Get(int row, int col)
{
for (int i = 0; i < AllCells.Count; i++)
{
if (AllCells[i].row == row && AllCells[i].column == col)
return AllCells[i];
}
return null;
}
public static void WriteResult()
{
String path = ResultFile;
string extension = System.IO.Path.GetExtension(path);
// 第一步：读取文件流
NPOI.SS.UserModel.IWorkbook workbook;
using (FileStream stream = new FileStream(path, FileMode.Open, FileAccess.Read))
{
if (extension.Equals(".xls"))
{
workbook = new HSSFWorkbook(stream);
}
else
{
workbook = new XSSFWorkbook(stream);
}
#region 读取第一个sheet页面
ISheet sheet = workbook.GetSheetAt(0);//第一个sheet页（列表）
int rowCount = sheet.LastRowNum;
IRow row = sheet.GetRow(0); //读取当前行数据
for (int i = startRow; i <= sheet.LastRowNum & i <= endRow; i++)
{
row = sheet.GetRow(i); //读取当前行数据
if (row == null) continue;
//Console.WriteLine(row.GetCell(1).ToString());
for (int j = startColumn; j < row.Cells.Count & j <= endColumn; j++)
{
ICell cell = row.GetCell(j);
CellWithPos cp = Get(i, j);
if (cp != null)
{
cell.SetCellValue(cp.value);
}
}
}
#endregion
}
// 第三步：写入文件流
using (FileStream stream = new FileStream(path, FileMode.Create, FileAccess.Write))
{
workbook.Write(stream);
workbook.Close();
}
}
public static void ReadExcel(string path)
{
try
{
IWorkbook wk = null;
string extension = System.IO.Path.GetExtension(path);
FileStream fs = File.OpenRead(path);
if (extension.Equals(".xls"))
{
//把xls文件中的数据写入wk中
wk = new HSSFWorkbook(fs);
}
else
{
//把xlsx文件中的数据写入wk中
wk = new XSSFWorkbook(fs);
}
fs.Close();
int sheetCount = wk.NumberOfSheets;//获取sheet的数量
ISheet sheet = wk.GetSheetAt(0);//第一个sheet页（列表）
int rowCount = sheet.LastRowNum;
IRow row = sheet.GetRow(0); //读取当前行数据
#region 读取第一个sheet页面
for (int i = startRow; i <= sheet.LastRowNum & i <= endRow; i++)
{
row = sheet.GetRow(i); //读取当前行数据
if (row == null) continue;
//Console.WriteLine(row.GetCell(1).ToString());
for (int j = startColumn; j < row.Cells.Count & j <= endColumn; j++)
{
ICell cell = row.GetCell(j);
double val = 0;
if (cell.CellType == CellType.Formula)
{
val = cell.NumericCellValue;
}
else if (cell.CellType == CellType.Numeric)
{
val = cell.NumericCellValue;
}
else if (cell.CellType == CellType.String || cell.CellType == CellType.Blank)
{
Double.TryParse(cell.StringCellValue, out val);
}
else
{
Console.WriteLine("單元格格式錯誤：" + i + "," + j);
Console.WriteLine("單元格的值：" + i + "," + j + " : " + val);
}
CellWithPos cp = Get(i, j);
if (cp != null)
{
cp.value += val;
}
else
{
AllCells.Add(new CellWithPos() { row = i, column = j, value = val });
}
}
}
#endregion
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
class CellWithPos
{
public int row;
public int column;
public double value = 0;
}
}
}