public async Task <IActionResult> UploadSingleFile([FromForm] FileResource fileResource) { if (fileResource.File == null) { ProblemDetails problem = new ProblemDetails { Title = "Failed posting file.", Detail = "File is null.", Instance = "ACD46F17-A239-4353-92A5-0B81AA0A96E9" }; return(BadRequest(problem)); } try { DateTime uploadDateTime = DateTime.Now; int fileExtPos = fileResource.File.FileName.LastIndexOf("."); string extension = fileResource.File.FileName.Substring(fileExtPos); string newFileName = Guid.NewGuid() + extension; User user = await HttpContext.GetContextUser(userService) .ConfigureAwait(false); File file = new File(newFileName, newFileName, user, uploadDateTime); await fileUploader.CopyFileToDirectory(fileResource.File, newFileName); await fileService.AddAsync(file); fileService.Save(); return(Ok(mapper.Map <File, FileResourceResult>(file))); } catch (FileExistException fileExistException) { ProblemDetails problem = new ProblemDetails { Title = fileExistException.Message, Detail = "Please rename filename.", Instance = "D902F8C6-23FF-4506-B272-C757BD709464" }; return(BadRequest(problem)); } }