this.Init();
        }

        private void Init()
        {
            Uri address = new Uri(HtmlPage.Document.DocumentUri, "ClientBin/showcase.xap");
            WebClient webClient = new WebClient();
            webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
            webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);
            webClient.OpenReadAsync(address);

        }

        void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            //在这里实现你的loading动画
            double per = Convert.ToDouble(e.ProgressPercentage) / Convert.ToDouble(100);
            loadBar.Height = (App.Current.Host.Content.ActualHeight - 16) * per;
        }

        void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
        {
            Assembly assembly = LoadAssemblyFromXap(e.Result, "showcase.dll");
            UIElement element = assembly.CreateInstance("showcase.Page") as UIElement;
            this.LayoutRoot.Children.Clear();
            this.LayoutRoot.Children.Add(element);
        }

        Assembly LoadAssemblyFromXap(Stream packageStream, String assemblyName)
        {
            Stream stream = Application.GetResourceStream(
                    new StreamResourceInfo(packageStream, null),
                    new Uri("AppManifest.xaml", UriKind.Relative)).Stream;

            String appManifestString = new StreamReader(stream).ReadToEnd();

            Deployment deployment = (Deployment)XamlReader.Load(appManifestString);

            Assembly assembly = null;
            foreach (AssemblyPart assemblyPart in deployment.Parts)
            {
                if (assemblyPart.Source == assemblyName)
                {
                    String source = assemblyPart.Source;

                    StreamResourceInfo streamInfo = Application.GetResourceStream(
                        new StreamResourceInfo(packageStream,
                        "application/binary"),
                        new Uri(source, UriKind.Relative));

                    assembly = assemblyPart.Load(streamInfo.Stream);
                    break;
                }
            }
            return assembly;
        }

        void Content_FullScreenChanged(object sender, EventArgs e)
        {
            this.ResizeFrame();
        }

        void Content_Resized(object sender, EventArgs e)
        {
            this.ResizeFrame();
        }

        void ResizeFrame()
        {
            (this as UserControl).Width = App.Current.Host.Content.ActualWidth;
            (this as UserControl).Height = App.Current.Host.Content.ActualHeight;
        }

        void FullScreenMode()
        {
            App.Current.Host.Content.IsFullScreen = !App.Current.Host.Content.IsFullScreen;

        }
    }