Hello all,
I have a problem updating the WPF Designer when binding to custom dependency properties.
In the following example, I create a simple Ellipse that I would like to fill with my custom MyAwesomeFill property. The MyAwesomeFill has a default value of a Yellow SolidColor brush.
The problem is that in the control form of the designer I cannot see the default fill of the ellipse (Yellow), instead the ellipse is filled with SolidColor (#00000000). However, when I run the application everything works PERFECTLY.
Do you have any ideas why this may be happenning?
Thanks.
Here's the code that I use:
XAML:
<UserControl x:Class="TestApplication.MyEllipse"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="300" Width="300">
<Grid>
<Ellipse Stroke="Black" StrokeThickness="5" Fill="{Binding MyAwesomeFill}"></Ellipse>
</Grid>
</UserControl>
C#:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace TestApplication
{
public partial class MyEllipse : UserControl
{
#region Dependency property MyAwesomeFill
//Define and register dependency property
public static readonly DependencyProperty MyAwesomeFillProperty = DependencyProperty.Register(
"MyAwesomeFill",
typeof(Brush),
typeof(MyEllipse),
new PropertyMetadata(new SolidColorBrush(Colors.Yellow), new PropertyChangedCallback(OnMyAwesomeFillChanged))
);
//property wrapper
public Brush MyAwesomeFill
{
get { return (Brush)GetValue(MyAwesomeFillProperty); }
set { SetValue(MyAwesomeFillProperty, value); }
}
//callback
private static void OnMyAwesomeFillChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
MyEllipse m = (MyEllipse)obj;
m.OnMyAwesomeFillChanged(e);
}
#endregion
//callback
protected virtual void OnMyAwesomeFillChanged(DependencyPropertyChangedEventArgs e)
{
}
public MyEllipse()
{
InitializeComponent();
DataContext = this;
}
}
}