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Question[Problem] Why can not Pass Image between 2 Views by using the same ViewModel (MVVM) Pin
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AnswerRe: [Problem] Why can not Pass Image between 2 Views by using the same ViewModel (MVVM) Pin
Richard Deeming20-Jun-21 23:37
mveRichard Deeming20-Jun-21 23:37 
Quote:
DisplayView.xaml
XAML
<Page.DataContext>
    <vm:DisplayViewModel/>
</Page.DataContext>
...
<Image x:Name="imgDisplayView" Source="{Binding ImagePath}">
	<Image.RenderTransform>
		<TransformGroup>
			<TranslateTransform/>
			<RotateTransform/>
			<ScaleTransform/>
		</TransformGroup>
	</Image.RenderTransform>
</Image>
...
The problem is that your DisplayPanelView is setting its DataContext to a new instance of your viewmodel. The image path you set on the DataContext of the DisplayControlView will have no effect on the property of the separate viewmodel instance used as the DataContext for DisplayPanelView.

You need both controls to use the same viewmodel instance for their DataContext. Depending on how your ReviewView viewmodel is set up, you probably want to expose a single DisplayViewModel instance as a property on that viewmodel, and have both Display... views bound to that.

For example:
C#
public class ReviewViewModel : ViewModelBase
{
    private DisplayViewModel _display = new DisplayViewModel();
    
    public DisplayViewModel
    {
        get { return _display; }
        set { SetValue(ref _display, value); }
    }
}
ReviewView.xaml:
XAML
<views:DisplayControlView DataContext="{Binding Path=DisplayViewModel}" />
<views:DisplayPanelView DataContext="{Binding Path=DisplayPanelView}" />
Remove the <Page.DataContext> from both DisplayControlView and DisplayPanelView pages.



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