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POWPF Unable to get commands and dependency properties to work together, or am i just using them wrong?
 

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  1. POWPF Unable to get commands and dependency properties to work together, or am i just using them wrong?
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    <p>I have created a wpf application into which I have added a user control and a custom control. The custom control is used within the user control (planned to be used in many other Types of user controls). </p> <p>For a quick example, the custom control has a dependency property of type <code>Brush</code> titled backgroundcolour, This is then set in the defualt template for the custom control as the background for the border. My thinking was that I would be able to set this value from the user control using the <code>Command</code> and <code>CommandParameter</code> properties. As i tried to do below</p> <p>User Control xaml (TestControl is the custom control)</p> <pre><code>&lt;Grid&gt; &lt;Grid.Resources&gt; &lt;MyNamespace:EditColourCommand x:Key="EditColour"/&gt; &lt;/Grid.Resources&gt; &lt;Grid.ContextMenu&gt; &lt;ContextMenu&gt; &lt;MenuItem Name="Test" Header="Test" Command="{StaticResource EditColour}" CommandParameter="{Binding ElementName=testControl1, Path=BackgroundColour, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /&gt; &lt;/ContextMenu&gt; &lt;/Grid.ContextMenu&gt; &lt;MyNamespace:TestControl HorizontalAlignment="Left" Margin="213,90,0,0" x:Name="testControl1" VerticalAlignment="Top" Height="77" Width="230"/&gt; &lt;/Grid&gt; </code></pre> <p>My custom Control Code Behind:</p> <pre><code>public class TestControl : Control { static TestControl() { DefaultStyleKeyProperty.OverrideMetadata(typeof(TestControl), new FrameworkPropertyMetadata(typeof(TestControl))); } public static DependencyProperty BackgroundColourProperty = DependencyProperty.Register("BackgroundColour", typeof(Brush), typeof(TestControl), new PropertyMetadata(Brushes.Blue, BackgroundColourPropertyChangedHandler)); public Brush BackgroundColour { get { return (Brush)GetValue(BackgroundColourProperty); } set { SetValue(BackgroundColourProperty, value); } } public static void BackgroundColourPropertyChangedHandler(DependencyObject sender, DependencyPropertyChangedEventArgs e) { } } </code></pre> <p>Finally, The Command</p> <pre><code>public class EditColourCommand : ICommand { public bool CanExecute(object parameter) { return true; } public event EventHandler CanExecuteChanged; public void Execute(object parameter) { parameter = Brushes.Black; } } </code></pre> <p>The command gets fired and it has the defualt value in this case blue as a parameter but it never sets the value to black. Can someone push me in the right direction please?</p>
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    1. USBenjamin Gale
    1. USE.L Dunn
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    1. COSimilar question: http://stackoverflow.com/questions/2985547/xaml-namescope-and-template-question-concerning-wpf-contextmenu
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      1. USLuke Woodward
    2. COAlthough they are dealing with the same sort of things, menuitems and binding. He, from what i can gather is trying to have mutliple menu items depending on style. i on the other hand am trying to set a dependency property held by the custom control that could be set on any object in the custom control template. so that someone can re-template the control and still get the same effect if they bind to the dependency property. as dowhilefor showed below i can send the actual object as a parementer and change it that way so there are no scoping issues. i was just hoping for a general command.
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      1. USE.L Dunn
    3. COAnother similar question: http://stackoverflow.com/questions/1013558/elementname-binding-from-menuitem-in-contextmenu
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      1. USLuke Woodward
 

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