How to save images from web in Isolated Storage?

Question

In my application I have list of urls to images. And what I need to do is download this images and save them in Isolated Storage.

What I already have:

using (IsolatedStorageFile localFile = IsolatedStorageFile.GetUserStoreForApplication()) {
...
foreach (var item in MyList)
{
    Uri uri = new Uri(item.url, UriKind.Absolute);

    BitmapImage bitmap = new BitmapImage(uri);
    WriteableBitmap wb = new WriteableBitmap(bitmap);

    using (IsolatedStorageFileStream fs = localFile.CreateFile(GetFileName(item.url)))//escape file name
    {
        wb.SaveJpeg(fs, wb.PixelWidth, wb.PixelHeight, 0, 85);
    }
}
...
}

This code have place inside function in my App.xaml.cs file. I have tried many solutions, in this one the problem is "Invalid cross-thread access".

How can I make it work?

Answer 1

Solution for this problem is:

foreach (var item in MyList)
{
    Uri uri = new Uri(item.url, UriKind.Absolute);
    HttpWebRequest request = HttpWebRequest.Create(uri) as HttpWebRequest;
    request.BeginGetResponse((ar) =>
    {
        var response = request.EndGetResponse(ar);
        Deployment.Current.Dispatcher.BeginInvoke(() =>
        {
            using (var stream = response.GetResponseStream())
            {
                var name = GetFileName(item.url);
                if (localFile.FileExists(name))
                {
                    localFile.DeleteFile(name);
                }
                using (IsolatedStorageFileStream fs = localFile.CreateFile(name))
                {
                    stream.CopyTo(fs);
                }
            }
        });
    }, null);
}