Netcoreapi operation excel table

One 、 Open source framework MiniExcel

MiniExcel（ Recommended ）

MiniExcel Simple 、 Efficient avoidance OOM Of .NET Handle Excel check 、 Write 、 Fill data tool .

The current mainstream framework (EPPlus ,NPIO) Most of them need to load all data into memory for easy operation , But this can lead to memory consumption problems ,MiniExcel Try to Stream Write the underlying algorithmic logic from an angle , Can make the original 1000 many MB The occupancy is reduced to a few MB, Avoid out of memory situations .

Two 、 introduce MiniExce Of Nuget package

Install-Package MiniExcel -Version 1.26.5

3、 ... and 、 operation Excel Example

1. Prepare two Excel form

Two data formats

2. establish Student class

because MiniExcel Generated is strongly typed data , So we need a class to accept data

using System.ComponentModel.DataAnnotations;

namespace _02_EFWithOptionExcel
{
    
    public class Student
    {
    
        public int ID {
     get; set; }
        [StringLength(50)]
        public string Name {
     get; set; }
        [StringLength(2)]
        public string Sex {
     get; set; }
        [StringLength(11)]
        public string Phone {
     get; set; }
        [StringLength(200)]
        public string Address {
     get; set; }
    }
}

3. Use EFCore To manipulate data

establish Excel controller

using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using MiniExcelLibs;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace _02_EFWithOptionExcel.Controllers
{
    
   
    [Route("api/[controller]")]
    [ApiController]
    public class MinExcelController : ControllerBase
    {
    
        private readonly StudentDbContext _studentDbContext;
        private readonly IWebHostEnvironment _webHostingEnvironment;
        public MinExcelController(IWebHostEnvironment hostingEnvironment,StudentDbContext studentDbContext)
        {
    
            _webHostingEnvironment = hostingEnvironment;
            _studentDbContext = studentDbContext;
        }

        [HttpPost]
       public List<Student>  Get([FromForm] IFormCollection formCollection)
        {
    
            // File set 
            FormFileCollection fileCollection = (FormFileCollection)formCollection.Files;
            // Students gather 
            List<Student> lists = new List<Student>();
            // Traverse the files in the collection 
            foreach (IFormFile file in fileCollection)
            {
    
                // Open file stream
                Stream stream = file.OpenReadStream();
                // manipulation stream, Generate sets 
                var rows = stream.Query<Student>().ToList();
                // Put two excel Merge into a collection 
                lists = lists.Union(rows).ToList();
            }
            // Batch add data 
            _studentDbContext.Student.AddRange(lists);
            // Save the data 
            _studentDbContext.SaveChanges();

            return lists;
        }
    }
}

Four 、 test Api