如何在Windows Phone中保存和检索来自隔离存储的图像？

   我在windows phone中使用隔离存储。我想保存图像并从隔离存储中检索图像。我尝试了一些但是我无法保存图像

    I am Using Isolated Storage in windows phone.I want save image and retrieve image from isolated storage. I tried some come but i can't save image

private void Watchlist_Click_1(object sender, RoutedEventArgs e)
        {
            XmlWriterSettings x_W_Settings = new XmlWriterSettings();
            x_W_Settings.Indent = true;

            using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (IsolatedStorageFileStream stream = ISF.OpenFile("People.xml", FileMode.Create))
                {
                   // var imageSource = PictureDecoder.DecodeJpeg(stream);

                   // BitmapImage bi = new BitmapImage();

                    XmlSerializer serializer = new XmlSerializer(typeof(List<StoreProduct>));
                    using (XmlWriter xmlWriter = XmlWriter.Create(stream, x_W_Settings))
                    {
                        //bi.SetSource(imageStream);
                        serializer.Serialize(xmlWriter, GeneratePersonData());
                        MessageBox.Show("Data Save!!!!");
                    }
                }
            }
            this.NavigationService.Navigate(new Uri(string.Format("/LoginPage.xaml?selectedItem="), UriKind.Relative));
        }

private List<StoreProduct> GeneratePersonData()
        {
            List<StoreProduct> l1 = new List<StoreProduct>();
            StoreProduct p = new StoreProduct();
            p.Title = App.CurrentArticle.Titles;
            p.ProductName = App.ProductList.ProductName;
            p.Price = App.ProductList.Price;
            p.Description = App.ProductList.Shortdescription;
           // p.ProductImage = App.ProductLists.ProductImage;
            l1.Add(p);
            return l1;
        }