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
     
      ((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。");            }        }