Dependency property not working, trying to set through style setter

Question

I am trying to set up a custom style for my newly made usercontrol, however i am getting the error : "Cannot convert the value in attribute 'Property' to object of type 'System.Windows.DependencyProperty'." I thought i had set up Dependency properties but it seemed this was not the case, so i did some research and added: ``` public static readonly DependencyProperty ImageSourceProperty = DependencyProperty.Register("ImageSource", typeof(BitmapSource), typeof(Image)); ``` to make this: -- MyButton.Xaml.Cs -- ``` namespace Client.Usercontrols { public partial class MyButton : UserControl { public static readonly DependencyProperty ImageSourceProperty = DependencyProperty.Register("ImageSource", typeof(BitmapSource), typeof(Image)); public MyButton() { InitializeComponent(); } public event RoutedEventHandler Click; void onButtonClick(object sender, RoutedEventArgs e) { if (this.Click != null) this.Click(this, e); } BitmapSource _imageSource; public BitmapSource ImageSource { get { return…

Accepted Answer

The standard form for a dependency property is (i've added in your information):

```
public BitmapSource ImageSource
{
    get { return (BitmapSource)GetValue(ImageSourceProperty); }
    set { SetValue(ImageSourceProperty, value); }
}

/* Using a DependencyProperty as the backing store for ImageSource. 
   This enables animation, styling, binding, etc... */

public static readonly DependencyProperty ImageSourceProperty =
        DependencyProperty.Register("ImageSource", 
            typeof(BitmapSource), 
            typeof(MyButton), 
            new UIPropertyMetadata(null)
        );
```

it seems like your also trying to pass through the dependency property to the ImageSource of the object called "tehImage". You can set this up to automatically update using the PropertyChangedCallback... this means that whenever the property is updated, this will call the update automatically.

thus the property code becomes:

```
public BitmapSource ImageSource
{
    get { return (BitmapSource)GetValue(ImageSourceProperty); }
    set { SetValue(ImageSourceProperty, value); }
}

/* Using a DependencyProperty as the backing store for ImageSource.  
   This enables animation, styling, binding, etc... */

public static readonly DependencyProperty ImageSourceProperty =
        DependencyProperty.Register("ImageSource", 
            typeof(BitmapSource), typeof(MyButton), 
            new UIPropertyMetadata(null, 
                ImageSource_PropertyChanged
            )
        );

private static void ImageSource_PropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs e)
{
    ((MyButton)source).tehImage.ImageSource = (ImageSource)e.NewValue
}
```

Hopefully with the correctly registered dependency property, this will help you narrow down the issue (or even fix it)

Dependency property not working, trying to set through style setter

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