-1

我有以下方法可以调整给定图像的大小并将其缓存

[OutputCache(Duration = 3600, VaryByParam = "id")]

    public ActionResult UserFace(int id)
    {
        var cacheKey = String.Format("userPhotoURICacheKey_{0}", id);
        var defaultFileCacheKey = String.Format("userPhotoDefaultCacheKey");

        HttpContext.Cache[cacheKey] = HttpContext.Cache[cacheKey] ?? UserService.GetPhotoURI(id) ?? string.Empty;
        var userPhoto = (String)HttpContext.Cache[cacheKey];

        if (!string.IsNullOrEmpty(userPhoto))
        {
            var filename = id + ".jpg";


            //crop and resize
            var image = Image.FromFile(new Uri(userPhoto).LocalPath);

            const int resW = 200;
            const int resH = 200;

            var minEdge = Math.Min(image.Width, image.Height);
            var scaleFactor =(float) minEdge/Math.Min(resH, resW);

            var newImage = new Bitmap(resW, resH);
            var sufrace = Graphics.FromImage(newImage);
            sufrace.InterpolationMode = InterpolationMode.HighQualityBicubic;

            sufrace.DrawImage(image, 0, 0, image.Width / scaleFactor, image.Height / scaleFactor);

            var stream = new MemoryStream();
            newImage.Save(stream, ImageFormat.Jpeg);

            stream.Position = 0;
            var file = File(stream, "image/jpg", filename);

            return file;

        }
        HttpContext.Cache[defaultFileCacheKey] = HttpContext.Cache[defaultFileCacheKey] ?? File("~/Content/images/no_photo.jpg", "image/jpg", "nophoto.jpg");
        return (FileResult)HttpContext.Cache[defaultFileCacheKey];
    }

在另一种方法中，我正在尝试使用新图像更新缓存图像

public void UploadUserImage(byte[] arr, int userId)
    {
        Stream stream = new MemoryStream();
        stream.Write(arr, 0, arr.Length);
        using (var dataManager = factory.GetDataManager())
        {
            var userRepository = dataManager.GetRepository<IUserRepository>();
            var user = GetByID(userId);
            user.PhotoURI =
                        storageFactory.CreateFileStorageSender()
                            .Send(storageConfig.UsersPhotoPath, user.Id.ToString(), stream);
            user.PhotoSize = stream.Length;

            userRepository.Save(user);
            dataManager.Commit();
        }
    }

而且我收到“该进程无法访问该文件，因为它正在被另一个进程使用”错误。

4

2 回答 2

2

完成调整大小后处理图像以再次使用它。

于 2015-06-09T10:10:44.670 回答
0

您需要从代码中处理“file”、“image”和“newImage”对象。我认为文件对象的句柄给你这个错误。

于 2015-06-09T10:14:05.273 回答