莞深喷涂杨生 发表于 2024-2-11 02:34:19

C#使用MiniExcel导入导出数据到Excel/CSV文件

MiniExcel简介
简单、高效避免OOM的.NET处理Excel查、写、填充数据工具。
目前主流框架大多需要将数据全载入到内存方便操作,但这会导致内存消耗问题,MiniExcel 尝试以 Stream 角度写底层算法逻辑,能让原本1000多MB占用降低到几MB,避免内存不够情况。

特点:

[*]低内存耗用,避免OOM、频繁 Full GC 情况
[*]支持即时操作每行数据
[*]兼具搭配 LINQ 延迟查询特性,能办到低消耗、快速分页等复杂查询
[*]轻量,不需要安装 Microsoft Office、COM+,DLL小于150KB
[*]简便操作的 API 风格
项目地址:mini-software/MiniExcel: Fast, Low-Memory, Easy Excel .NET helper to import/export/template spreadsheet (support Linux, Mac) (github.com)

安装 MiniExcel

导出数据
public class Student
{
      public string? Name { get; set; }
      public string? Home { get; set; }
      public int? Age {get; set; }   
}

//获得当前目录的路径
string currentDirectory = Directory.GetCurrentDirectory();

//合并当前目录与Excel文件名
var path = Path.Combine(currentDirectory, $"{Guid.NewGuid()}.xlsx");

List<Student> studentList = new List<Student>()
{
      new Student { Name = "小东", Home = "New York", Age = 25 },
      new Student { Name = "小西", Home = "London", Age = 22 },
      new Student { Name = "小南", Home = "Paris", Age = 28 },
      new Student { Name = "小北", Home = "Tokyo", Age = 24 },
      new Student { Name = "小王", Home = "Berlin", Age = 26 }
};

MiniExcel.SaveAs(path, studentList);导入Excel中如下图所示:

但是目前还不支持Excel的插入:

因此如果遇到不仅仅只是生成Excel,后续还要向Excel添加数据的需求,可以用csv代替:
//获得当前目录的路径
string currentDirectory = Directory.GetCurrentDirectory();

//合并当前目录与CSV文件名
var path = Path.Combine(currentDirectory, $"{Guid.NewGuid()}.csv");

List<Student> studentList = new List<Student>()
{
      new Student { Name = "小东", Home = "New York", Age = 25 },
      new Student { Name = "小西", Home = "London", Age = 22 },
      new Student { Name = "小南", Home = "Paris", Age = 28 },
      new Student { Name = "小北", Home = "Tokyo", Age = 24 },
      new Student { Name = "小王", Home = "Berlin", Age = 26 }
};

MiniExcel.SaveAs(path, studentList);生成的CSV文件如下图所示:

向CSV文件继续添加数据:
//获得当前目录的路径
string currentDirectory = Directory.GetCurrentDirectory();

//合并当前目录与Excel文件名
//var path = Path.Combine(currentDirectory, $"{Guid.NewGuid()}.csv");
var path = Path.Combine(currentDirectory, "10de09bb-ad8c-4430-b717-5f24117a11a6.csv");

List<Student> studentList = new List<Student>()
   {
       new Student { Name = "小东", Home = "New York", Age = 25 },
       new Student { Name = "小西", Home = "London", Age = 22 },
       new Student { Name = "小南", Home = "Paris", Age = 28 },
       new Student { Name = "小北", Home = "Tokyo", Age = 24 },
       new Student { Name = "小王", Home = "Berlin", Age = 26 }
};

//MiniExcel.SaveAs(path, studentList);
MiniExcel.Insert(path, studentList);继续添加数据后的CSV文件如下图所示:

导入数据
var path = "你的文件路径";
var rows = MiniExcel.Query<Student>(path);实现效果如下所示:


来源:https://www.cnblogs.com/mingupupu/p/18013077
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