WP 图片加载时显示加载中

private BitmapImage srcimage = new BitmapImage();

        public MainPage()

        {

            InitializeComponent();



            progressBar1.IsIndeterminate = false; //进度条



            srcimage.CreateOptions = BitmapCreateOptions.None; //不延时加载

            
            srcimage.ImageOpened += new EventHandler<RoutedEventArgs>((sender, e) =>

            {

                progressBar1.IsIndeterminate = false;

                image1.Source = srcimage;

            });

        }

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        private void wc_picOpenReadImg(string url)

        {

            if (DeviceNetworkInformation.IsNetworkAvailable)

            {

                //中断下载过程

                srcimage.UriSource = new Uri("nopic.png", UriKind.Relative);



                image1.Source = new BitmapImage(new Uri("/Images/appbar.sync.rest.png", UriKind.Relative));



                progressBar1.IsIndeterminate = true;



                srcimage.UriSource = new Uri(url, UriKind.Absolute);

            }

            else

            {

                MessageBox.Show("网络未打开，请检查wifi或数据是否已开启。");

            }

        }