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| Guest | Binding to a custom dependency property When the source's "MyColor" property is changed, the GraphPanel's "AxisColor" is not changed. This binding works fine if I use one of GraphPanel's built-in dependency properties, such as Tag. ----------------------------------------------- public class MySource : INotifyPropertyChanged { .... public SolidColorBrush MyColor {...} .... } ----------------------------------------------- <Grid> <!-- DataContext set in code to MySource --> .... <GraphPanel : DockPanel> <Binding Path="MyColor"> </GraphPanel> .... </Grid> ------------------------------------------------ public class GraphPanel { .... public static readonly DependencyProperty AxisColorProperty = DependencyProperty.Register( "AxisColor", typeof(SolidColorBrush), typeof(GraphPanel), new PropertyMetadata(Brushes.Black)); public SolidColorBrush AxisColor { get { return (SolidColorBrush)this.GetValue(AxisColorProperty); } set { this.SetValue(AxisColorProperty, value); } } .... } |
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| Guest | Mystery Solved I found the following at http://www.quepublishing.com/article...seqNum=2&rl=1: WARNING: .NET property wrappers are bypassed at run-time when setting dependency properties in XAML! Although the XAML compiler depends on the property wrapper at compile-time, at run-time WPF calls the underlying GetValue and SetValue methods directly! Therefore, to maintain parity between setting a property in XAML and procedural code, it's crucial that property wrappers do not contain any logic in addition to the GetValue/SetValue calls. If you want to add custom logic, that's what the registered callbacks are for. All of WPF's built-in property wrappers abide by this rule, so this warning is for anyone writing a custom class with its own dependency properties. "diffeq" wrote: > When the source's "MyColor" property is changed, the GraphPanel's "AxisColor" > is not changed. > > This binding works fine if I use one of GraphPanel's built-in dependency > properties, such as Tag. > > ----------------------------------------------- > > public class MySource : INotifyPropertyChanged > { > ... > public SolidColorBrush MyColor {...} > ... > } > > ----------------------------------------------- > > <Grid> <!-- DataContext set in code to MySource --> > ... > <GraphPanel : DockPanel> > <Binding Path="MyColor"> > </GraphPanel> > ... > </Grid> > > ------------------------------------------------ > > public class GraphPanel > { > ... > public static readonly DependencyProperty AxisColorProperty = > DependencyProperty.Register( > "AxisColor", > typeof(SolidColorBrush), > typeof(GraphPanel), > new PropertyMetadata(Brushes.Black)); > > public SolidColorBrush AxisColor > { > get { return (SolidColorBrush)this.GetValue(AxisColorProperty); } > set { this.SetValue(AxisColorProperty, value); } > } > ... > } |
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