I needed a trivial example of how INotifyPropertyChanged is useful, but my demo app is going totally against my expectations.
namespace WpfApp2CS
{
public class ViewModel
{
public double Value { get; set; }
}
}
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApp2CS"
Title="MainWindow" Width="300" Height="150"
x:Class="WpfApp2CS.MainWindow">
<Window.DataContext>
<local:ViewModel />
</Window.DataContext>
<StackPanel>
<Slider Value="{Binding Value, Mode=OneWayToSource}" />
<TextBlock Text="{Binding Value, Mode=OneWay}" />
</StackPanel>
</Window>
I was under the impression that the setter of Value would be hit every time the slider moves, but the getter would only be hit once because ViewModel doesn't raise INotifyPropertyChanged.PropertyChanged. This is not the case; the text updates with every movement of the slider.
