server/aspnetapp/Controllers/WebUI/PublicController.cs

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using aspnetapp.Helper;
using aspnetapp.Models;
using Microsoft.AspNetCore.Mvc;

namespace aspnetapp.Controllers
{
    public class PublicController : Controller
    {
        private readonly CounterContext _context;

        public PublicController(CounterContext context)
        {
            _context = context;
        }
        public IActionResult DownloadFj(string id)
        {
            var att = _context.Templates.FirstOrDefault(m => m.Unid == id);
            if (att != null && att.Filecon != null)
            {
                return File(att.Filecon.ToArray(), MimeMapping.GetMimeMapping(att.Filename), att.Filename);
            }
            else
            {
                return Content("");
            }
        }

        public async Task<IActionResult> MCExcelAsync([FromForm(Name = "filecon")] IFormFile filecon)
        {

            if (filecon.Length > 0)
            {
                using (MemoryStream memoryStream = new MemoryStream())
                {
                    await filecon.CopyToAsync(memoryStream);
                    byte[] con = memoryStream.ToArray();
                    var q = _context.Templates.FirstOrDefault(s => s.Type == (int)EnumCode.ExportFill.早餐模板Excel);
                    if (q == null)
                    {
                        var t = new TemplateEntity();
                        t.Unid = Guid.NewGuid().ToString();
                        t.Bz = filecon.FileName.Substring(0, filecon.FileName.LastIndexOf("."));
                        t.Filename = filecon.FileName;
                        t.Createdate = DateTime.Now;
                        t.Filecon = con;
                        t.Type = (int)EnumCode.ExportFill.早餐模板Excel;
                        _context.Templates.Add(t);
                    }
                    else
                    {
                        q.Bz = filecon.FileName.Substring(0, filecon.FileName.LastIndexOf("."));
                        q.Filename = filecon.FileName;
                        q.Createdate = DateTime.Now;
                        q.Filecon = con;
                    }
                    _context.SaveChanges();
                }
            }
            return Json(new { state = "ok" });
        }