javascript - 尝试上传文件时无法读取未定义的属性 'length'

Question

我正在尝试上传任何文件扩展名的文件。我正在上传帖子，但是当运行该函数时，它崩溃并出现错误:“无法准备未定义的属性‘长度’”

upload(fileToUpload: File): Promise<FileResponse[]> {
    const formData: FormData = new FormData();

    formData.append('fileKey', fileToUpload, fileToUpload.name);
    return this.http
        .post<FileResponse[]>(this.baseUrl + this.urlUpload, formData, { headers: {'Content-Type': undefined }})
        .toPromise().then((response) => {
          console.log(response);
          return response;
        }).catch((e) => {
          console.log(e);
          return e;
        });
  }

这是我的后端 C#:

        [HttpPost]
        [Route("upload")]
        [DisableFormValueModelBinding]
        [RequestSizeLimit(104857600)]
        public async Task<IActionResult> Upload()
        {

            var fileUploaded = await _fileService.UploadFile(FormOptions, reader);
            return Json(new StandardResult<List<FileResponse>>(HttpStatusCode.Created, fileUploaded).Reply);
        }

有什么解决办法吗？

Answer 1

我认为这是针对这一行的:

{'Content-Type': undefined }

或者删除此行或放置通用“类型”，例如application/octet-stream

更多信息:https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types