Question

I searched the forum and did everything as advised to create dependancy property and bind it to checkbox, but for some reason it doesn’t bind.

<CheckBox IsChecked="{Binding ElementName=MainWindow, Path=isLoop}" Content="" Height="22" HorizontalAlignment="Left" Margin="250,208,0,0" x:Name="checkBox1" VerticalAlignment="Top" Width="22" />

C#

  public bool isLoop
    {
        get { return (bool)GetValue(isLoopProperty); }
        set { SetValue(isLoopProperty, value); }
    }

    public static readonly DependencyProperty isLoopProperty =
        DependencyProperty.Register("isLoop", typeof(bool), typeof(MainWindow), new UIPropertyMetadata(true));

Answer 1

You’ve made some key mistakes in your sample.

First, you are not binding to an object that supports your “isLoop” property (unless “MainWindow” is a custom control that has that property). Somewhere in that CheckBox’s hierarchy, you need to set the DataContext to an object that supports it, or bind to an element that has that property.

Second, you should rarely, if ever, create a dependency property in your business object. For business objects, follow the INotifyPropertyChanged pattern. Typically, you should create dependency properties in visual UI elements, such as custom controls in order to be able to bind data to them (a target, not the source).

So, to fix your problem, you should probably create an object that implements INotifyPropertyChanged, create an IsLoop property that throws the NotifyPropertyChanged event in the setter, and set this object as the DataContext to the CheckBox’s parent container (or further up the hierarchy if appropriate).

HTH