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DependencyPropert not set from XAML with DynamicResource as parameter

I am trying to develop a custom custom three state control and so far I have been using CTF to set properties.

But I would like to change this to use the WPF property system with PropertiesDependencies.

Unfortunately I am unable to get it to work, when I set a property from my xaml (father) with DynamicResource, no value is set.

<common:StateImageButton x:Name="story_buttonRecord"  BackTest="{DynamicResource backTest}" />

Here is the code I have in my button controller:

public ImageSource BackTest
    {
        get { return (ImageSource)this.GetValue(BackProp); }
        set { this.SetValue(WidthProp,value); }
    }

    public static readonly DependencyProperty BackProp =
        DependencyProperty.Register(
            "BackTest",
            typeof(ImageSource),
            typeof(StateImageButton),
            new FrameworkPropertyMetadata());

I am not yet using the property in my xaml button, but apparently it is not even included in Setter. I have searched a lot online with no success. So maybe I missed something.

Thanks in advance for your help, Boris

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1 answer


Also, WPF doesn't use a setter to set a property, it does it directly.

The way to debug when WPF sets a property is to add a callback when the property is set like this.



public static readonly DependencyProperty BackProp =
    DependencyProperty.Register(
        "BackTest",
        typeof(ImageSource),
        typeof(StateImageButton),
        new FrameworkPropertyMetadata(OnBackChanged));

private static void OnBackChanged(
    DependencyObject d, 
    DependencyPropertyChangedEventArgs e)
{
    var sender = (StateImageButton)d; // Put a breakpoint here
}
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