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QT CLR 调用 C# NPOI读写EXCEL——新建C#库(1/3)

  • 2026-04-03 06:57:49
QT CLR 调用 C# NPOI读写EXCEL——新建C#库(1/3)

一、NPOI 核心概念

什么是 NPOI?

NPOI (.NET version of POI) 是一个开源的 .NET 库,用于读写 Microsoft Office 格式文件,特别是 Excel。它移植自 Java 的 POI 项目,是 .NET 平台下功能最全面的免费 Office 文档操作库。

核心优势

  • ✅ 完全免费开源 (Apache 2.0 协议)
  • ✅ 无需安装 Microsoft Office
  • ✅ 支持 .xls 和 .xlsx 格式
  • ✅ 跨平台 (Windows/Linux/macOS)
  • ✅ 高性能,低内存占用

访问架构:

IWorkbook (工作簿)    // 管理整个 Excel 文件    ↓ISheet (工作表)       // 管理单个工作表    ↓IRow (行)            // 管理单行数据    ↓ICell (单元格)        // 操作单个单元格

二、实现

1.新建C#类库,命名为“ExcelToolLibCSharp”

类库项目

2.添加NPOI库

3.添加一个ExcelOperateObject类

添加状态封装对象:用于封装和管理单个 Excel 文件在整个操作生命周期中的所有状态和资源。它在 NPOI 操作库中扮演着数据中心和资源管理器的角色。

using NPOI.SS.UserModel;using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ExcelToolLibCSharp{  public class ExcelOperateObject  {      ///<summary>      /// 文件流对象      ///</summary>      public FileStream Fs { getset; }       ///<summary>       /// NPOI 工作簿对象      ///</summary>      public IWorkbook WorkBook { getset; }      ///<summary>     /// 文件存在状态标志     ///</summary>      public bool FileExists { getset; }      ///<summary>      /// Excel 文件完整路径      ///</summary>      public string FilePath { getset; }      publicvoidDispose()      {          WorkBook?.Close();          Fs?.Close();          Fs?.Dispose();      }         }}

4.添加一个ExcelHelper类

(1)实例化excel状态对象字典,使用 Handle 机制管理多个 Excel 文件,后续根据key查找对应的excel操作对象

using NPOI.HSSF.UserModel;using NPOI.SS.UserModel;using NPOI.XSSF.UserModel;using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ExcelToolLibCSharp{     public classExcelHelper     {         private Dictionary<int, ExcelOperateObject> excelOperateDictionary;         public ExcelHelper()         {             excelOperateDictionary = new Dictionary<int, ExcelOperateObject>();         }    }}

(2)每个 Excel 文件分配唯一句柄

///<summary>///  自动句柄分配算法///</summary>///<param name="keys"></param>///<returns></returns>privateintFindMinMissingKey(List<int> keys){     keys.Sort(); // 排序现有键值     int minMissing = 1;     foreach (int key in keys)     {         if (key > minMissing) return minMissing;         minMissing = key + 1;      }      return minMissing; // 返回最小的可用整数              }         

(3)实例化excel操作对象,.xlsx对应XSSFWorkbook,.xls对应XSSFWorkbookHSSFWorkbook

///<summary>/// 根据文件路径自动判断excel文件格式,如果存在则打开,否则则新建excel文档///</summary>///<param name="filePath"></param>///<returns>返回句柄</returns>public ExecuteResult<intCreateOrOpenFile(string filePath){     ExcelOperateObject excelOperateObject = new ExcelOperateObject();     List<int> keys = excelOperateDictionary.Keys.ToList();     int handle = FindMinMissingKey(keys);     try     {         if (!File.Exists(filePath))         {             excelOperateObject.Fs = new FileStream(filePath, FileMode.CreateNew, FileAccess.ReadWrite);             if (filePath.IndexOf(".xlsx") > 0)             {                  excelOperateObject.WorkBook = new XSSFWorkbook() as IWorkbook;             }             else if (filePath.IndexOf(".xls") > 0)             {                   excelOperateObject.WorkBook = new HSSFWorkbook() as IWorkbook;             }              excelOperateObject.FileExists = false;              excelOperateObject.FilePath = filePath;          }          else          {              var fs = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite);               if (filePath.IndexOf(".xlsx") > 0)               {                    excelOperateObject.WorkBook = new XSSFWorkbook(fs) as IWorkbook;               }               else if (filePath.IndexOf(".xls") > 0)                {                    excelOperateObject.WorkBook = new HSSFWorkbook(fs) as IWorkbook;                }                excelOperateObject.FileExists = true;                excelOperateObject.FilePath = filePath;                excelOperateObject.Fs = fs;           }           excelOperateDictionary.Add(handle, excelOperateObject);           return ExecuteResult<int>.Success(handle);       }       catch (Exception ex)       {             string logPath = "excelToolLog.txt";             using (StreamWriter writer = new StreamWriter(logPath))             {                 writer.WriteLine($"ex.Message:{ex.Message}");             }             return ExecuteResult<int>.Error($"ex.Message:{ex.Message}");        } }

(4)根据句柄,查找Excel操作对象,设置单元格值

///<summary>/// 单元格值设置///</summary>///<param name="sheetName">表格名称</param>///<param name="rowIndex">行数</param>///<param name="columnIndex">列数</param>///<param name="value">设置值</param>///<returns></returns>public ExecuteResult SetCellValue(int handle, string sheetName, int rowIndex, int columnIndex, stringvalue){    try    {        ISheet sheet;        IRow row;        ICell cell;        if (!excelOperateDictionary.ContainsKey(handle)) return ExecuteResult.Error($"handle:{handle}不存在!");         ExcelOperateObject excelOperateObject = excelOperateDictionary[handle];          sheet = excelOperateObject.WorkBook.GetSheet(sheetName) == null ? excelOperateObject.WorkBook.CreateSheet(sheetName) : excelOperateObject.WorkBook.GetSheet(sheetName);           row = sheet.GetRow(rowIndex) == null ? sheet.CreateRow(rowIndex) : sheet.GetRow(rowIndex);           cell = row.GetCell(columnIndex) == null ? row.CreateCell(columnIndex) : row.GetCell(columnIndex);           cell.SetCellValue(value);           return ExecuteResult.Success();      }      catch (Exception ex)      {           return ExecuteResult.Error(ex.Message);      }}

(5)根据句柄,查找Excel操作对象,读取单元格值

///<summary>/// 文本单元格值获取///</summary>///<param name="sheetName">表格名称</param> ///<param name="rowIndex">行数</param>///<param name="columnIndex">列数</param>///<returns>获取结果值</returns>public ExecuteResult<stringGetCellValue(int handle, string sheetName, int rowIndex, int columnIndex){     try     {        ISheet sheet;        IRow row;        ICell cell;         if (!excelOperateDictionary.ContainsKey(handle)) return ExecuteResult<string>.Error($"handle:{handle}不存在!");         ExcelOperateObject excelOperateObject = excelOperateDictionary[handle];         if (!File.Exists(excelOperateObject.FilePath)) return ExecuteResult<string>.Error("文件不存在");          sheet = excelOperateObject.WorkBook.GetSheet(sheetName);          if (sheet == nullreturn ExecuteResult<string>.Error($"表格名称{sheetName},不存在");          row = sheet.GetRow(rowIndex);          if (row == nullreturn ExecuteResult<string>.Error($"行{rowIndex},不存在");          cell = row.GetCell(columnIndex);           if (cell == nullreturn ExecuteResult<string>.Error($"列{cell},不存在");            return ExecuteResult<string>.Success(cell.StringCellValue);      }     catch (Exception ex)     {          return ExecuteResult<string>.Error(ex.Message);     }}

(6)根据句柄,把值写入文档

public ExecuteResult WriteToFile(int handle){       try       {           if (!excelOperateDictionary.ContainsKey(handle)) return ExecuteResult.Error($"handle:{handle}不存在!");           ExcelOperateObject excelOperateObject = excelOperateDictionary[handle];           excelOperateObject.WorkBook.Write(excelOperateObject.Fs);           return ExecuteResult.Success();      }      catch (Exception ex)      {           return ExecuteResult.Error(ex.Message);      }}

(7)注销相关资源,避免内存泄漏

public void Dispose(int handle){    if (!excelOperateDictionary.ContainsKey(handle)) return;    ExcelOperateObject excelOperateObject = excelOperateDictionary[handle];    excelOperateObject.Dispose();    excelOperateDictionary.Remove(handle);}

三、使用

 using ExcelToolLibCSharp;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApp2{    internal class Program    {       staticvoidMain(string[] args)       {            ExcelHelper excelHelper = new ExcelHelper();            var handle = excelHelper.CreateOrOpenFile("D:\\test.xlsx");            excelHelper.SetCellValue(handle.RetT, "Sheet1"11,"excel test");            excelHelper.SetCellValue(handle.RetT, "Sheet1"11,"excel test");            excelHelper.WriteToFile(handle.RetT);            var res = excelHelper.GetCellValue(handle.RetT, "Sheet1"11);            Console.WriteLine($"excel 读取数值:{res.RetT}");             while (true) ;        }   }}

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  1. CONNECT:[ UseTime:0.001003s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001679s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000784s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000675s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001478s ]
  6. SELECT * FROM `set` [ RunTime:0.000553s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001526s ]
  8. SELECT * FROM `article` WHERE `id` = 473941 LIMIT 1 [ RunTime:0.001386s ]
  9. UPDATE `article` SET `lasttime` = 1775295042 WHERE `id` = 473941 [ RunTime:0.004595s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000719s ]
  11. SELECT * FROM `article` WHERE `id` < 473941 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001250s ]
  12. SELECT * FROM `article` WHERE `id` > 473941 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002267s ]
  13. SELECT * FROM `article` WHERE `id` < 473941 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001954s ]
  14. SELECT * FROM `article` WHERE `id` < 473941 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001808s ]
  15. SELECT * FROM `article` WHERE `id` < 473941 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005418s ]
0.190529s