我正在尝试将名为UploadedFileEntities的SQL表中的数据导出到excel文件中,我在前端使用了angular,在后端使用了.NET Core(ASP.Net Core样板框架)。问题是由于File是Controller Base类的一个类,我无法按Application类返回文件,那么如何从ApplicationService基类返回File?
这是我的代码
using Abp.Application.Services;
using Abp.Application.Services.Dto;
using Abp.Domain.Repositories;
using Abp.Domain.Uow;
using Abp.EntityFrameworkCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using OfficeOpenXml;
using PHC.Entities;
using PHC.EntityFrameworkCore;
using PHC.MySystemServices.MyApplicationServices.DTO;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using IdentityModel.Client;
using Ninject.Activation;
using DocumentFormat.OpenXml.ExtendedProperties;
namespace PHC.MySystemServices.MyApplicationServices
{
public class MyApplicationAppService : AsyncCrudAppService<MyApplication, MyApplicationDto, int, PagedAndSortedResultRequestDto, MyApplicationDto>
{
private readonly IDbContextProvider<PHCDbContext> _dbContextProvider;
private PHCDbContext db => _dbContextProvider.GetDbContext();
private readonly IRepository<MyApplication,int> _repository;
private IHostingEnvironment _env;
public MyApplicationAppService(IDbContextProvider<PHCDbContext> dbContextProvider, IRepository<MyApplication, int> repository, IHostingEnvironment hostingEnvironment) :base(repository)
{
_repository = repository;
_dbContextProvider = dbContextProvider;
this._env = hostingEnvironment;
}
public async Task<IActionResult> ExportV2(CancellationToken cancellationToken)
{
// query data from database
await Task.Yield();
var list = db.UploadedFileEntities.ToList();
var stream = new MemoryStream();
ExcelPackage.LicenseContext = LicenseContext.NonCommercial; // this is important
using (var package = new ExcelPackage(stream))
{
var workSheet = package.Workbook.Worksheets.Add("Sheet1");
workSheet.Cells.LoadFromCollection(list, true);
package.Save();
}
stream.Position = 0;
string excelName = $"UserList-{DateTime.Now.ToString("yyyyMMddHHmmssfff")}.xlsx";
//return File(stream, "application/octet-stream", excelName);
return new File(stream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", excelName); //it doesn't work
}
}
如果我返回File Visual Studio,请告诉我
不可说话的成员'File'不能像方法一样使用
如果我返回新的File Visual Studio,请告诉我:
无法创建静态类'File'的实例]]
我正在尝试将名为UploadedFileEntities的SQL表中的数据导出到excel文件中,我在前端使用了angular,在后端使用了.NET Core(ASP.Net Core样板框架)。问题是我不能...
文件方法是从ControllerBase.File
派生而未继承的。