从独立存储中的图像设置辅助平铺背景图像

Question

这就是我从图像 url 获取流的方式：

        using (var httpClient = new HttpClient())
        {
            response = await httpClient.GetStreamAsync(new Uri(IMAGEURL_HERE, UriKind.Absolute));
        }

        SaveImage(response);

这就是我将它保存到 IsoloatedStorage 的方式：

    private void SaveImage(Stream result)
    {
        using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
        {
            BitmapImage bitmap = new BitmapImage();
            bitmap.SetSource(result);
            var wb = new WriteableBitmap(bitmap);

            using (IsolatedStorageFileStream fileStream = file.CreateFile("FILENAME.jpg"))
            {
                int width = wb.PixelWidth;
                int height = wb.PixelHeight;
                if (wb.PixelWidth > 336)
                {
                    width = 336;
                }
                if (wb.PixelHeight > 336)
                {
                    height = 336;
                }
                Extensions.SaveJpeg(wb, fileStream, width, height, 0, 100);
            }
        }
    }

假设文件是​​ FILENAME.jpg，我想我可以将它设置为 BackgroundImage 到这样的辅助磁贴：

var tileData = new FlipTileData()
{
...
BackgroundImage = new Uri("isostore:/Shared/ShellContent/FILENAME.jpg", UriKind.Absolute),
...

这行不通。它不会抛出异常，只有图像不会显示。我想念什么？当然，如果我将 Image Url 作为 Uri 放到 BackgroundImage 中，它可以工作，但这不是我想要的。

编辑：我在这里看到了类似的问题，但它对我的代码没有帮助。

Answer 1

试试这个。可能是它的帮助。

string imageFolder = @"\Shared\ShellContent"; 
string shareJPEG = "FILENAME.jpg";

private void SaveImage(Stream result)
{
    using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
    {
        if(!myIsolatedStorage.DirectoryExists(imageFolder))
        {
            myIsolatedStorage.CreateDirectory(imageFolder);
        }

        if (myIsolatedStorage.FileExists(shareJPEG))
        {
            myIsolatedStorage.DeleteFile(shareJPEG);
        }

        string filePath = System.IO.Path.Combine(imageFolder, shareJPEG);
        IsolatedStorageFileStream fileStream = myIsolatedStorage.CreateFile(filePath);
        BitmapImage bitmap = new BitmapImage();
        bitmap.SetSource(result);
        WriteableBitmap wb = new WriteableBitmap(bitmap);

        // Encode WriteableBitmap object to a JPEG stream. 
        int width = wb.PixelWidth;
        int height = wb.PixelHeight;
        if (wb.PixelWidth > 336)
        {
            width = 336;
        }
        if (wb.PixelHeight > 336)
        {
            height = 336;
        }
        Extensions.SaveJpeg(wb, fileStream, width, height, 0, 100);

        fileStream.Close();


    }
} 

private void CreateTile()
{
    var tileData = new FlipTileData()
    {
         ....
         string filePath = System.IO.Path.Combine(imageFolder, shareJPEG);                
         BackgroundImage = new Uri(@"isostore:" + filePath, UriKind.Absolute);
         ....
    } 
}