SkAndroidCodec :: NewFromStream返回null System.IO.Stream Xamarin Android

Question

我对BitmapFactory有疑问。我正在使用Xamarin，并且尝试对从内部存储中检索到的流进行解码，但是每当我尝试使用位图工厂解码时，它都不会返回位图。但是，如果我从URL检索完全相同的图像并使用Bitmap Factory进行解码，则效果很好。这没有任何意义，请帮忙！

public static async Task<Bitmap> HandleContentImage(Post post)
    {

        var charsToRemove = new string[] { "/", ".com", ":", "-", ".", "_", ";" };
        var ContentImageUri = post.image_url;
        foreach (var c in charsToRemove)
        {
            ContentImageUri = ContentImageUri.Replace(c, string.Empty);
        }
        HomeService homeService = new HomeService();
        try
        {
            Stream CachedContentImageStream = await homeService.LoadImageFromCache(ContentImageUri + ".jpg");

            if (CachedContentImageStream != null)
            {
                Bitmap ContentImageBitmap = await BitmapFactory.DecodeStreamAsync(CachedContentImageStream);
                return ContentImageBitmap;
            }
            else
            {
                byte[] ContentImageArray = await homeService.DownloadImageBytesAsync(post.image_url);
                Stream ContentImageStream = new MemoryStream(ContentImageArray);
                await homeService.SaveImageToCache(ContentImageStream, ContentImageUri + ".jpg");
                Bitmap ContentImageBitmap = await BitmapFactory.DecodeStreamAsync(ContentImageStream);

                return ContentImageBitmap;
            }
        }
        catch (Exception e)
        {
            Console.WriteLine("Error: " + e.Message);
            return null;
        }
    }