Usually when you try to use BitmapImage, Image, WriteableImage in other than UI thread, you'll get exception. This is because these classes are derived from System.Windows.Threading.DispatcherObject, which is blocked access from other than UI thread. There exists an extension to WriteableBitmap, LoadJpeg, which is works fine in thread, but you have to create WriteableBitmap object on main UI thread.
- using System.Windows;
- using System.Windows.Media.Imaging;
- using System.IO;
- using System.Threading;
- namespace ImageHelpers
- {
- public delegate void ImageLoadedDelegate(WriteableBitmap wb, object argument);
- public class ImageThread
- {
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- public ImageThread()
- {
- }
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- {
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- {
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- {
- Deployment.Current.Dispatcher.BeginInvoke(() =>
- {
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- });
- }
- });
- }
- }
- }
Using scenario:
- ImageThread imageThread = new ImageThread();
- private void Init()
- {
- imageThread.ImageLoaded += LoadFinished;
- }
- void LoadFinished(WriteableBitmap bmp, object arg)
- {
- Imgage1.Source = bmp;
- }
- void DeferImageLoading( Stream imgStream )
- {
- // we have to give size
- var bmp = new WriteableBitmap(80, 80);
- imageThread.LoadThumbAsync(imgStream, bmp, this);
- }
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