DependencyProperty data binding

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5.00/5 (1 vote)

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Hello!

I try to bind my UI to custom DependencyProperty:

C#

...

<window.resources>
    <local:localization x:key="Localization" xmlns:x="#unknown" xmlns:local="#unknown"></local:localization>
</window.resources>
    <grid name="mainStack" datacontext="{StaticResource Localization}">
         <Button Padding="10,3" Margin="5" Content="{Binding Path=BtnAdd}"   Command="New"/>
    </grid>

Also I have class "Localization":

C#

class Localization : DependencyObject, INotifyPropertyChanged
    {
        public static DependencyProperty BtnAddProperty;
        
        static Localization()
        {
            BtnAddProperty = DependencyProperty.Register("BtnAdd", typeof(string), typeof(Localization));
            
        }

        public string BtnAdd
        {
            set
            {
                SetValue(BtnAddProperty, value);
            }
            get
            {
                return (string)GetValue(BtnAddProperty);
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = this.PropertyChanged;
            if (handler != null)
            {
                PropertyChangedEventArgs e = new PropertyChangedEventArgs(propertyName);
                handler.Invoke(this, e);
            }
        }

        public Localization()
        {
            BtnAdd = MainWindowRes.BtnAdd;
        }

        public void SwitchLanguage()
        {
            BtnAdd = MainWindowRes.BtnAdd;
            OnPropertyChanged("BtnAdd");
        }
       
    }

First time my UI element gets my property value. But when I use my method SwitchLanguage(), property gets new data, and UI still have first value.

Can someone help me please?

P.S.
Sorry, for my English.

Eugene

Posted 4-Aug-11 22:41pm

Member 7826605

Updated 4-Aug-11 22:51pm

v2

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Comments

Herman<T>.Instance 5-Aug-11 4:47am

have you done a debug?

Member 7826605 5-Aug-11 4:51am

Yes, When calling OnPropertyChanged(), handler PropertyChanged is null

Herman<T>.Instance 5-Aug-11 4:58am

what if you match to the documentation: http://msdn.microsoft.com/en-us/library/5z57dxz2.aspx ?

Member 7826605 5-Aug-11 5:16am

Thank you, but it did not help.

Sir.Ixildore 5-Aug-11 14:36pm

Can you supply a third parameter(FrameworkPropertyMetadata object) to your call to Register and supply it a PropertyChangedCallback object?

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Sir.Ixildore · Answer 1 · 2011-08-05T08:46:00

 BtnAddProperty = DependencyProperty.Register("BtnAdd", typeof(string), typeof(Localization),new FrameworkPropertyMetadata(new PropertyChangedCallback(OnBtnAddPropertyChanged)));
...
private static void OnBtnAddPropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
Button btn = o as Button;
... //some localization on button content
btn.OnPropertyChanged(e.Property.Name);
...
}

hope this works.