描述：Microsoft.AspNetCore.Http.IFormFileCollection 实现附件快速上传功能代码。

上传附件代码

        [Route("myUploadFile")][HttpPost]public ActionResult MyUploadFile([FromForm] upLoadFile rfile){string newFileName = Guid.NewGuid().ToString("N") + rfile.mingcheng;string dirPath = Path.Combine(new string[] { Environment.CurrentDirectory, "wwwroot", "File", "FileUpload", newFileName });if (System.IO.Directory.Exists(dirPath)){System.IO.Directory.CreateDirectory(dirPath);System.Threading.Thread.Sleep(0);}string filePath = Path.Combine(new string[] { dirPath, newFileName });var t = Request.Form.Files[0];using (FileStream fs = System.IO.File.Open(filePath, FileMode.OpenOrCreate)){string fileName = rfile.files[0].FileName;byte[] bs = new byte[rfile.files[0].Length];GetPicThumbnail(rfile.files[0].OpenReadStream()).Read(bs, 0, bs.Length);fs.Write(bs, 0, bs.Length);fs.Close();}return new ObjectResult(new { code = "1", msg = "文件上传成功" });}

upLoadFile Model类定义

    public class upLoadFile{public string mingcheng { get; set; }public Microsoft.AspNetCore.Http.IFormFileCollection files { get; set; }public string miaoshu { get; set; }}

附件下载代码：

      [Route("myGetFile")][HttpGet]public ActionResult MyGetFile(string id){PhysicalFileResult f = new PhysicalFileResult(@"E:\work\codes\技术积累\临时\weixinshare\weixinshare\weixinshare\wwwroot\File\weixinimg\2edf0b9324cb44edaa7d73ea46ab0b15.jpg", "application/file");f.FileDownloadName = "ddd.jpg";f.EnableRangeProcessing = true;f.LastModified = DateTimeOffset.Now;return f;}