How do I bind a Polygon to an existing PointCollection in WPF?

Question

My current implementation doesn\'t show anything on the form even though the collections I thought bounded have data (I checked in debug).

Here\'s some code:

Answer 1

I'm not sure why you are getting binding errors, but on first sight the code you have looks fine.

I have written a small piece of code that works, so you can check that out and see if you have missed something. I guess it must be kinda similar to yours..

Relevant part of the XAML:

Code-behind for the window:

public partial class Window1 : Window, INotifyPropertyChanged
{
    public Window1()
    {
        InitializeComponent();

        this.ImagePoints = new PointCollection
            (new [] { new Point(1, 2), new Point(34, 12), new Point(12, 99) });

        //Important - maybe you missed this?
        this.DataContext = this;
    }

    public event PropertyChangedEventHandler PropertyChanged;
    PointCollection imagePoints;
    public PointCollection ImagePoints
    {
        get
        {
            return this.imagePoints;
        }
        set
        {
            if (this.imagePoints != value)
            {
                this.imagePoints = value;
                if (this.PropertyChanged != null)
                {
                    PropertyChanged(this, new PropertyChangedEventArgs("ImagePoints"));
                }
            }
        }
    }

    private void btnSetNew(object sender, RoutedEventArgs e)
    {
        this.ImagePoints = new PointCollection(
            new[] { new Point(23, 2), new Point(12, 556), new Point(4, 89) });
    }
}