WPF unable to bind rectangle background image-CodePudding

I want to create rectangle with dynamic background image but it somehow wont work. I am not sure if its problem with some types or bindings as its my first binding in life.

Crete new instance of my custom control

        BitmapImage image = new(new Uri(@filePath));
        ImageBrush imageBrush = new ImageBrush(image);
        InputBlock inputBlock = new()
        {
            Height= image.Height   20,
            Width= image.Width,
            ImageBrush = imageBrush
        };

my cs

    public partial class InputBlock : UserControl
    {
            public static readonly DependencyProperty ImageBrushProperty =
         DependencyProperty.Register("ImageBrush", typeof(ImageBrush), 
         typeof(InputBlock),
         new PropertyMetadata(null));

    public ImageBrush ImageBrush
    {
        get { return (ImageBrush)GetValue(ImageBrushProperty); }
        set { SetValue(ImageBrushProperty, value); }
    }


        public InputBlock()
        {
            InitializeComponent();
        }

    }

in xaml

    <Rectangle x:Name="ImageRectangle" Grid.Column="0" Grid.Row="0" Fill="{Binding ImageBrush}" Width="500" Height="500">
    </Rectangle>

It works when I use color like red but it wont work with my ImagePath please what I am doing wrong?

CodePudding user response：

You have to specify the source object of the Binding, i.e. the object that owns the source property.

Because that is the UserControl instance, write

Fill="{Binding ImageBrush,
               RelativeSource={RelativeSource AncestorType=UserControl}}"

People may tell you to set the DataContext of the UserControl instance to itself, e.g. by setting DataContext = this; in the constructor. This is however a big mistake, because it prevents that you can use standard DataContext-based Bindings of the properties of your UserControl.