如何在 mvc4 中创建图像优化(获取错误)

Question

嗨，我在为图像优化内容编写代码时正在使用 mvc4 显示我需要这样做的错误，任何机构请帮助我解决这个问题 我收到此错误

这是我的代码：控制器

 public ActionResult Uploading(ImageModel model)
        {
            var uploadFolder = HostingEnvironment.MapPath("~/App_Data");
            uploadFolder = Path.Combine(uploadFolder, DateTime.Now.ToString("yyyy/MM/dd/hh/mm/ss/fff"));
            Directory.CreateDirectory(uploadFolder);
            var streamProvider = new PreserveFilenameMultipartFileStreamProvider(uploadFolder);
             Request.Content.ReadAsMultipartAsync(streamProvider).ContinueWith(t =>
            {
                foreach (var uploadedFile in Directory.GetFiles(uploadFolder))
                {
                    var medium = Path.Combine(uploadFolder, "medium-" + Path.GetFileName(uploadedFile));
                    var thumbnail = Path.Combine(uploadFolder, "thumb-" + Path.GetFileName(uploadedFile));
                    ImageTools.Resize(uploadedFile, thumbnail, 100, 100);
                    ImageTools.Resize(uploadedFile, medium, 50, 50);
                }
                return new HttpResponseMessage()
                {
                    Content = new StringContent("File uploaded.")
                };
            });
           return View("Upload", model);
        } 

这是我的索引页：

@using (Html.BeginForm("Uploading", "Upload", FormMethod.Post, new { enctype = "multipart/form-data" }))
 {
     <input type="file" name="ImageUploaded" id="btnUpload" multiple="multiple" accept="image/*"  />
 <button type="submit"  id="Upload">Upload</button>
     <br />
     //@Html.DisplayForModel(@ViewData["Time"]);        
     <label>@ViewData["Time"]</label>
 }

在这里我在内容：HTTPRequestBase上收到错误不包含对内容的defnation

       Request.Content.ReadAsMultipartAsync(streamProvider).ContinueWith(t =>

任何人都可以帮助我解决问题吗，提前谢谢

Answer 1

请在您的视图中使用以下行：

@using (Html.BeginForm("Action Name", "Controller Name", FormMethod.Post, new { enctype = "multipart/form-data" }))

由于您正在上传文件，因此需要定义上述代码行。