private void Window_Loaded(object sender, RoutedEventArgs e)
{
// Instantiate the data service context.
context = new PhotoDataContainer(svcUri);
// Call the method to get photos from the data service.
GetPhotosFromService(MergeOption.AppendOnly);
}
// Provides data to the ViewModel with the provided objects,
// which enables us to restore the ViewModel after reactivation.
public void LoadData(PhotoDataContainer context,
DataServiceCollection <PhotoInfo> photos)
{
this._context = context;
this.Photos = photos;
IsDataLoaded = true;
}
// Loads data from the data service for the first time.
public void LoadData()
{
// Instantiate the context and binding collection.
_context = new PhotoDataContainer(svcRootUri);
Photos = new DataServiceCollection <PhotoInfo>(_context);
// Load the data from the PhotoInfo feed.
Photos.LoadAsync(new Uri("/PhotoInfo", UriKind.Relative));
}
// Restores the ViewModel state from the supplied state dictionary.
public void RestoreState(IDictionary <string, object> dictionary)
{
// Create a dictionary to hold any stored binding collections.
Dictionary <string, object> collections;
// Get the stored DataServiceState object from the dictionary.
var state = dictionary["DataServiceState"] as DataServiceState;
if (state != null)
{
// Restore the context and binding collections.
PhotoDataContainer context
= state.Restore(out collections) as PhotoDataContainer;
// Get the binding collection of Title objects.
DataServiceCollection <PhotoInfo> photos
= collections["Photos"] as DataServiceCollection <PhotoInfo>;
// Initialize the application with stored data.
App.ViewModel.LoadData(context, photos);
dictionary.Remove("DataServiceState");
}
}
