private void Worker_DoWork(object sender, DoWorkEventArgs e)
{
try
{
using (WebClient client = new WebClient()
{
CachePolicy = new RequestCachePolicy(RequestCacheLevel.CacheIfAvailable)
})
{
ImageLoaderOptions options = e.Argument as ImageLoaderOptions;
BitmapImage bmp = new BitmapImage();
bmp.BeginInit();
bmp.StreamSource = new MemoryStream(client.DownloadData(options.Uri));
bmp.CacheOption = BitmapCacheOption.OnLoad;
if (options.DecodePixelWidth != -1)
{
bmp.DecodePixelWidth = options.DecodePixelWidth;
}
bmp.EndInit();
bmp.Freeze();
e.Result = bmp;
}
}
catch
{
e.Result = null;
}
}
/// <summary>
/// Updates the UriSource.
/// </summary>
/// <param name="oldValue">The old value.</param>
private void UpdateUriSource(Uri oldValue)
{
if (_image == null || !IsLoaded)
{
return;
}
if (DesignerProperties.GetIsInDesignMode(this))
{
_image.Opacity = 1;
return;
}
if (oldValue != null && UriSource != null && oldValue.OriginalString == UriSource.OriginalString)
{
return;
}
IsImageLoading = true;
_image.Source = null;
if (UriSource == null)
{
return;
}
if (_worker != null)
{
_worker.DoWork -= Worker_DoWork;
_worker.RunWorkerCompleted -= Worker_RunWorkerCompleted;
}
_worker = new BackgroundWorker();
_worker.DoWork += Worker_DoWork;
_worker.RunWorkerCompleted += Worker_RunWorkerCompleted;
ImageLoaderOptions options = new ImageLoaderOptions {
Uri = UriSource, DecodePixelWidth = -1
};
if (RenderAtSize)
{
UpdateLayout();
options.DecodePixelWidth = (int)Math.Max(ActualWidth, ActualHeight);
}
_worker.RunWorkerAsync(options);
}
