Asp .Net Core Excel導入和導出

ASP .Net Core使用EPPlus實現Api導入導出，這里使用是EPPlus 4.5.2.1版本，.Net Core 2.2。在linux上運行的時候需要安裝libgdiplus 。

下面我們看下如何實現導出導入的功能。

新建項目ASP.NET Core Web Api 、添加Test類

public class Test
{
   public int Id { get; set; }
   public string Name { get; set; }
   public int Age { get; set; }
}

 

導出Excel文件

新建控制器ExecelController

 

using System;

using System.Collections.Generic;

using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using OfficeOpenXml;

namespace WebApplication5.Controllers
{
[ApiController]
    public class ExecelController : ControllerBase
    {

        [Route("api/Execel/TOExecel")]
        public IActionResult TOExecel()
        {
            var list = new List<Test>();

            list.Add(new Test()
            {
                Id = 1,
                Name = "Test",
                Age = 22,

            });

            byte[] fileContents;
            using (ExcelPackage package = new ExcelPackage())
            {

                 
                ExcelWorksheet worksheet = package.Workbook.Worksheets.Add(".Net Core 導出");

                 
                worksheet.Cells[1, 1].Value = "序號";
                worksheet.Cells[1, 2].Value = "Id";
                worksheet.Cells[1, 3].Value = "名稱";
                worksheet.Cells[1, 4].Value = "年齡";

                int i = 2;

                foreach (var item in list)
                {
                    worksheet.Cells["A" + i].Value = i - 1;
                   worksheet.Cells["B" + i].Value = item.Id;
                    worksheet.Cells["C" + i].Value = item.Name;
                    worksheet.Cells["D" + i].Value = item.Age;
                    i = i + 1;
                }

                fileContents = package.GetAsByteArray();
                if (fileContents == null || fileContents.Length == 0)
                {
                    return NotFound();
                }
            }
            return File(fileContents, "application/ms-excel", $"{Guid.NewGuid().ToString()}.xlsx");
        }
}
}

 

 

導入Excel文件

[Route("api/Execel/Import")]
        public async Task<IActionResult> Import(IFormFile excelFile)
        {

            var msg = "";
            if (excelFile == null || excelFile.Length <= 0)
            {
                msg = "請選擇導入文件!";
                return Ok(msg);
            }

 
            if (!Path.GetExtension(excelFile.FileName).Equals(".xlsx", StringComparison.OrdinalIgnoreCase))
            {
                msg = "請選擇導入文件為.xlsx的后綴名!";
                return Ok(msg);
            }

            try
            {
                using (var stream = new MemoryStream())
                {
                    await excelFile.CopyToAsync(stream);

                     using (var package = new ExcelPackage(stream))
                    {

                        StringBuilder sb = new StringBuilder();
                        ExcelWorksheet worksheet = package.Workbook.Worksheets[0];
                        int rowCount = worksheet.Dimension.Rows;
                        int ColCount = worksheet.Dimension.Columns;
                        bool bHeaderRow = true;

 
                        for (int row = 2; row <= rowCount; row++)
                        {
                            Test model = new Test();
                            for (int col = 1; col <= ColCount; col++)
                            {
                                if (bHeaderRow)
                                {
                                    switch (col)
                                    {
                                        case 1:
                                            model.Id = int.Parse(worksheet.Cells[row, col].Value.ToString());
                                            break;
                                        case 2:
                                            model.Name = worksheet.Cells[row, col].Value.ToString();
                                            break;
                                         case 3:
                                            model.Age = int.Parse(worksheet.Cells[row, col].Value.ToString());
                                            break;
                                    }
                                }

                                else
                                {
                                    switch (col)
                                    {
                                        case 1:
                                            model.Id = int.Parse(worksheet.Cells[row, col].Value.ToString());
                                            break;
                                        case 2:
                                            model.Name = worksheet.Cells[row, col].Value.ToString();
                                            break;

                                         case 3:
                                            model.Age = int.Parse(worksheet.Cells[row, col].Value.ToString());
                                           break;
                                    }
                                }
                            }

                            //插入model即可
                        }
                    }
                }
                msg = "導入成功!";
                return Ok(msg);
            }

            catch (Exception ex)
            {
                msg = ex.Message;
                return Ok(msg);
            }
        }

 

　　按照格式導入即可完成導入功能。

　　這里導出是通過流的方式進行導出的，一般來說也可以先把Excel保存到服務器，然后直接通過Url訪問服務器的文件的地址就可以實現在線下載。通過流導出的話就不需要去訪問服務器文件了，訪問接口查詢數據就直接導出了。

在導入的時候目前測試僅僅支持.xlsx格式的，.xls格式的Excel在基於流創建ExcelPackage類的新實例的時候會報為空的錯誤。var package = new ExcelPackage(stream)還有待修改。

 

 

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