使用添加个人表单数据从MVC上传到Web Api的文件

Question

我正在尝试上传带有其他表单数据的文件,并通过MVC发布到Web API,但我无法完成.

MVC Side

首先,我在MVC收到了提交的表格.这是对此的行动.

    [HttpPost]
            public async Task<ActionResult> Edit(BrandInfo entity) {

                try {
                    byte[] logoData = null;
                    if(Request.Files.Count > 0) {
                        HttpPostedFileBase logo = Request.Files[0];
                        logoData = new byte[logo.ContentLength];
                        logo.InputStream.Read(logoData, 0, logo.ContentLength);
                        entity.Logo = logo.FileName;
                        entity = await _repo.Update(entity.BrandID, entity, logoData);
                    }
                    else
                        entity = await _repo.Update(entity,entity.BrandID);
                    return RedirectToAction("Index", "Brand");
                }
                catch(HttpApiRequestException e) {
// logging, etc                   
                    return RedirectToAction("Index", "Brand");
                }
            }

下面的代码将Multipartform发布到Web API

string requestUri = UriUtil.BuildRequestUri(_baseUri, uriTemplate, uriParameters: uriParameters);
            MultipartFormDataContent formData = new MultipartFormDataContent();
            StreamContent streamContent = null;
            streamContent = new StreamContent(new MemoryStream(byteData));            
            streamContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data") {
                FileName = "\"" + fileName + "\"",
                Name = "\"filename\""
            };
            streamContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            formData.Add(streamContent);
            formData.Add(new ObjectContent<TRequestModel>(requestModel, _writerMediaTypeFormatter), "entity");
            return _httpClient.PutAsync(requestUri, formData).GetHttpApiResponseAsync<TResult>(_formatters);

正如您所看到的,我正在尝试使用相同的方式发送文件数据和对象MultipartFormDataContent.我找不到更好的方式来发送我的实体ObjectContent.我也在使用JSON.Net Serializer

关于小提琴手,帖子看起来很成功.

PUT http://localhost:12836/api/brand/updatewithlogo/13 HTTP/1.1
Content-Type: multipart/form-data; boundary="10255239-d2a3-449d-8fad-2f31b1d00d2a"
Host: localhost:12836
Content-Length: 4341
Expect: 100-continue

--10255239-d2a3-449d-8fad-2f31b1d00d2a
Content-Disposition: form-data; filename="web-host-logo.gif"; name="filename"
Content-Type: application/octet-stream

GIF89a??L??????X???????wW??????????xH?U?)?-?k6???????v6?????????v?J?????????7????V:?=#???I(?xf?$???????
// byte data
// byte data
'pf?Y??y?????(?;
--10255239-d2a3-449d-8fad-2f31b1d00d2a
Content-Type: application/json; charset=utf-8
Content-Disposition: form-data; name=entity

{"BrandID":13,"AssetType":null,"AssetTypeID":2,"Logo":"web-host-logo.gif","Name":"Geçici Brand","Models":null,"SupplierBrands":null}
--10255239-d2a3-449d-8fad-2f31b1d00d2a--

Web API端

最后我在Web API端发帖并试图解析但我不能.由于MultipartFormDataStreamProvider的FileData和FormData集合是百达空.

[HttpPut]
        public void UpdateWithLogo(int id) {
            if(Request.Content.IsMimeMultipartContent()) {
                var x = 1; // this code has no sense, only here to check IsMimeMultipartContent
            }  

            string root = HttpContext.Current.Server.MapPath("~/App_Data");
            var provider = new MultipartFormDataStreamProvider(root);

            try {
                // Read the form data.
                 Request.Content.ReadAsMultipartAsync(provider);

                 foreach(var key in provider.FormData.AllKeys) {
                     foreach(var val in provider.FormData.GetValues(key)) {
                         _logger.Info(string.Format("{0}: {1}", key, val));
                     }
                 }

                // This illustrates how to get the file names.
                foreach(MultipartFileData file in provider.FileData) {
                    _logger.Info(file.Headers.ContentDisposition.FileName);
                    _logger.Info("Server file path: " + file.LocalFileName);
                }               
            }
            catch(Exception e) {
                throw new HttpApiRequestException("Error", HttpStatusCode.InternalServerError, null);
            }              
        }

我希望你能找到我的错误.

UPDATE

我也意识到,如果我注释掉StreamContent或ObjectContent只添加StringContent,我仍然无法得到任何东西MultipartFormDataStreamProvider.

Answer 1

最后我解决了我的问题,这是关于异步 :)

正如你在API动作方法中看到的那样,我已经ReadAsMultipartAsync同步地调用了方法,但这是一个错误.我不得不用它来调用它,ContinueWith所以我改变了我的代码后,我的问题解决了.

var files = Request.Content.ReadAsMultipartAsync(provider).ContinueWith<HttpResponseMessage>(task => {
                    if(task.IsFaulted)
                        throw task.Exception;
// do additional stuff
});