ASP.NET Core导入导出Excel文件
希望在ASP.NET Core中导入导出Excel文件，在网上搜了一遍，基本都是使用EPPlus插件，EPPlus挺好用，但商用需要授权，各位码友若有好的工具包推荐，请给我留言，谢谢！
本文利用Asp.net core Razor页面实现Excel文件的导入导出，参考大神的文章：ASP.NET Core 导入导出Excel xlsx 文件 - LineZero - 博客园 (cnblogs.com)
下面为详细步骤。
1，创建Razor项目
2，在Nuget包管理器中搜索EPPlus, 安装依赖包。EPPlus.Core已经弃用，EPPlus是支持Net Core的最新版本。
3，修改pages/Index.cshtml文件，创建基本导入导出页面。
@page
@model IndexModel
@{
ViewData["Title"] = "Home page";
} <div class="text-center">
<h1 class="display-4">ASP.NET Core导入导出Excel文件</h1>
</div> <h2></h2>
<hr />
<div>
<h4>导入Excel</h4>
<hr />
<form enctype="multipart/form-data" method="post" asp-page-handler="Import">
<input type="file" name="excelFile"/>
<input type="submit" value="导入"/>
</form>
<hr /> </div>
<hr />
<div>
<h4>导出Excel</h4>
<form enctype="multipart/form-data" method="post"asp-page-handler="Export">
<input type="submit" value="导出"/>
</form>
</div>
<hr />
4，修改Index.cshtml.cs文件中的代码，增加OnPostImport 和OnPostExport方法，分别用于导入、导出文件。
首先在构造函数中注入webHostEnvironment
private readonly IWebHostEnvironment _webHostEnvironment;
public IndexModel(IWebHostEnvironment webHostEnvironment)
{
_webHostEnvironment = webHostEnvironment;
}
OnPostImport代码：
public IActionResult OnPostImport(IFormFile excelFile)
{
ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
string sWebRootFolder = _webHostEnvironment.WebRootPath;
string sFileName = $"{Guid.NewGuid()}.xlsx";
FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
try
{
using (FileStream fs = new FileStream(file.ToString(), FileMode.Create))
{
excelFile.CopyTo(fs);
fs.Flush();
}
using(ExcelPackage package = new ExcelPackage(file))
{
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 = 1; row <= rowCount; row++)
{
for(int col = 1; col <= colCount; col++)
{
if (bheaderRow)
{
if(worksheet.Cells[row, col].Value != null)
{
sb.Append(worksheet.Cells[row, col].Value.ToString() + "\t");
}
else
{
sb.Append("\t");
}
}
else
{
if(worksheet.Cells[row, col].Value != null)
{
sb.Append(worksheet.Cells[row, col].Value.ToString() + "\t");
}
else
{
sb.Append("\t");
}
}
}
sb.Append(Environment.NewLine);
if (bheaderRow)
{
sb.Append("-----------------------------------------");
sb.Append(Environment.NewLine);
}
bheaderRow = false;
}
return Content(sb.ToString());
}
}
catch(Exception ex)
{
return Content(ex.Message);
}
}
其中必须添加
ExcelPackage.LicenseContext = LicenseContext.NonCommercial 用于指定EPPlus的使用授权为非商用。缺少会报错。
OnPostExport代码：
public IActionResult OnPostExport()
{
string sWebRootFolder = _webHostEnvironment.WebRootPath;
string sFileName = $"{Guid.NewGuid()}.xlsx";
FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
using (ExcelPackage package=new ExcelPackage(file))
{
//add worksheet
ExcelWorksheet workSheet = package.Workbook.Worksheets.Add("AspNetCore");
//add table header
workSheet.Cells[1, 1].Value = "ID";
workSheet.Cells[1, 2].Value = "Name";
workSheet.Cells[1, 3].Value = "Gender";
workSheet.Cells[1, 4].Value = "Age";
workSheet.Cells[1, 5].Value = "Remark"; //Add value
workSheet.Cells["A2"].Value = 1000;
workSheet.Cells["B2"].Value = "张三";
workSheet.Cells["C2"].Value = "男";
workSheet.Cells["D2"].Value = 25;
workSheet.Cells["E2"].Value = "ABCD"; workSheet.Cells["A3"].Value = 1001;
workSheet.Cells["B3"].Value = "李四";
workSheet.Cells["C3"].Value = "女";
workSheet.Cells["D3"].Value = 35;
workSheet.Cells["D3"].Style.Font.Bold = true; workSheet.Cells["A4"].Value = 1003;
workSheet.Cells["B4"].Value = "Amy";
workSheet.Cells["C4"].Value = "Female";
workSheet.Cells["D4"].Value = 22;
workSheet.Cells["E4"].Value = "Hello world"; workSheet.Cells["A5"].Value = 1004;
workSheet.Cells["B5"].Value = "Jim";
workSheet.Cells["C5"].Value = "Male";
workSheet.Cells["D5"].Value = 35;
workSheet.Cells["E5"].Value = 500; package.Save();
} return File(sFileName, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
}
Index.cshtml.cs的完整代码如下：
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;
using OfficeOpenXml;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WebAppTest.Models; namespace WebAppTest.Pages
{
public class IndexModel : PageModel
{
private readonly ILogger<IndexModel> _logger;
private readonly IWebHostEnvironment _webHostEnvironment; public IndexModel(ILogger<IndexModel> logger,IWebHostEnvironment webHostEnvironment)
{
_logger = logger;
_context = context;
_webHostEnvironment = webHostEnvironment;
} public void OnGet()
{ } public IActionResult OnPostImport(IFormFile excelFile)
{
ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
string sWebRootFolder = _webHostEnvironment.WebRootPath;
string sFileName = $"{Guid.NewGuid()}.xlsx";
FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
try
{
using (FileStream fs = new FileStream(file.ToString(), FileMode.Create))
{
excelFile.CopyTo(fs);
fs.Flush();
}
using(ExcelPackage package = new ExcelPackage(file))
{
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 = 1; row <= rowCount; row++)
{
for(int col = 1; col <= colCount; col++)
{
if (bheaderRow)
{
if(worksheet.Cells[row, col].Value != null)
{
sb.Append(worksheet.Cells[row, col].Value.ToString() + "\t");
}
else
{
sb.Append("\t");
}
}
else
{
if(worksheet.Cells[row, col].Value != null)
{
sb.Append(worksheet.Cells[row, col].Value.ToString() + "\t");
}
else
{
sb.Append("\t");
}
}
}
sb.Append(Environment.NewLine);
if (bheaderRow)
{
sb.Append("-----------------------------------------");
sb.Append(Environment.NewLine);
}
bheaderRow = false;
}
return Content(sb.ToString());
}
}
catch(Exception ex)
{
return Content(ex.Message);
}
} public IActionResult OnPostExport()
{
string sWebRootFolder = _webHostEnvironment.WebRootPath;
string sFileName = $"{Guid.NewGuid()}.xlsx";
FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
using (ExcelPackage package=new ExcelPackage(file))
{
//add worksheet
ExcelWorksheet workSheet = package.Workbook.Worksheets.Add("AspNetCore");
//add table header
workSheet.Cells[1, 1].Value = "ID";
workSheet.Cells[1, 2].Value = "Name";
workSheet.Cells[1, 3].Value = "Gender";
workSheet.Cells[1, 4].Value = "Age";
workSheet.Cells[1, 5].Value = "Remark"; //Add value
workSheet.Cells["A2"].Value = 1000;
workSheet.Cells["B2"].Value = "张三";
workSheet.Cells["C2"].Value = "男";
workSheet.Cells["D2"].Value = 25;
workSheet.Cells["E2"].Value = "ABCD"; workSheet.Cells["A3"].Value = 1001;
workSheet.Cells["B3"].Value = "李四";
workSheet.Cells["C3"].Value = "女";
workSheet.Cells["D3"].Value = 35;
workSheet.Cells["D3"].Style.Font.Bold = true; workSheet.Cells["A4"].Value = 1003;
workSheet.Cells["B4"].Value = "Amy";
workSheet.Cells["C4"].Value = "Female";
workSheet.Cells["D4"].Value = 22;
workSheet.Cells["E4"].Value = "Hello world"; workSheet.Cells["A5"].Value = 1004;
workSheet.Cells["B5"].Value = "Jim";
workSheet.Cells["C5"].Value = "Male";
workSheet.Cells["D5"].Value = 35;
workSheet.Cells["E5"].Value = 500; package.Save();
} return File(sFileName, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
}
}
}
5，运行项目，测试导入导出功能。
导出功能，单击导出按钮，浏览器会下载excel文件，
导入功能，点击选择文件按钮，选择刚下载的excel文件，点击导入按钮，跳转到导入结果页面。
------------------------ 完成---------------------