当我使用缩略图加载加载图像时内存不足

Question

当我尝试从我的文件夹中加载图像时，我得到一个： OutOfMemory

我在使用 MemoryStream 时遇到以下错误：

 public ImageSource ThumbnailLoadAsync()
        {
            var imageTemp = File.Exists(Image) ? Image : string.Format("{0}\\img\\unknow.png", ImageFolderRoot);

            MemoryStream ms = new MemoryStream(File.ReadAllBytes(imageTemp));
            ImageSourceConverter imageSourceConverter = new ImageSourceConverter();
            Thumbnail = (ImageSource)imageSourceConverter.ConvertFrom(ms);
            this.NotifyPropertyChanged("Thumbnail");
            return Thumbnail;
        }

然后，我看到了一个更好的 MemoryStream 版本，它是 RecyclableMemoryStreamManager，但我也遇到了同样的错误。也许我用错了。

这是我的代码：

 private RecyclableMemoryStreamManager _imageRecyclableMemoryStream;
        public ImageSource ThumbnailLoad()
        {
            var imageTemp = File.Exists(Image) ? Image : string.Format("{0}\\img\\unknow.png", ImageFolderRoot);
            _imageRecyclableMemoryStream = new RecyclableMemoryStreamManager();
            ImageSourceConverter imageSourceConverter = new ImageSourceConverter();
            Thumbnail = (ImageSource)imageSourceConverter.ConvertFrom((RecyclableMemoryStream)_imageRecyclableMemoryStream.GetStream(File.ReadAllBytes(imageTemp)));
            this.NotifyPropertyChanged("Thumbnail");
            return Thumbnail;
        }

Answer 1

我认为您只需要分配一次内存流并使用 using 块...类似于...

private static readonly RecyclableMemoryStreamManager recyclableMemoryStreamManager = new RecyclableMemoryStreamManager();

static void Main(string[] args)
{
    string data = "This is a sample text message.";
    var buffer = Encoding.ASCII.GetBytes(data);

    using (var memoryStream = recyclableMemoryStreamManager.GetStream())
    {
        memoryStream.Write(buffer, 0, buffer.Length);
    }
}