Question

I have a custom usercontrol with DataContext="{Binding RelativeSource={RelativeSource self}}"

On the code behind i’ve made a dependency property like:

    public static DependencyProperty ElementNameProperty = DependencyProperty.Register("ElementName",
        typeof(string),
        typeof(ElementControl),
        new PropertyMetadata(new PropertyChangedCallback((s, e) => { new Base().OnPropertyChanged("ElementName"); })));

    public string ElementName
    {
        get
        {
            return (string)base.GetValue(ElementNameProperty);
        }
        set
        {
            base.SetValue(ElementNameProperty, value);

        }
    }

Now when I try to use this usercontrol in my mainpage.xaml and use the following binding: <test.TestControl ElementName="{Binding name}" />, it keeps searching for ‘name’ property in my custom usercontrol instead of where it should come from?

What am I doing wrong ?

Answer 1

I eventually solved it this way. Not the way I wanted, but it’s a (in my eyes) pretty neat solution.

CustomUserControl.xaml

<UserControl x:Class="TestApp.Controls.CustomUserControl"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         mc:Ignorable="d"
         Width="75"
         Height="75">
  <Canvas x:Name="LayoutRoot"
      Background="Black">
    <StackPanel Orientation="Vertical">
      <Image x:Name="UCImage"
         Width="50"
         Height="50"
         HorizontalAlignment="Center" />
      <TextBlock x:Name="UCText"
             HorizontalAlignment="Center" />
    </StackPanel>
  </Canvas>
</UserControl>

CustomUserControl.xaml.cs

public partial class ElementControl : UserControl
{
    #region DependencyProperty ElementNameProperty
    public static DependencyProperty ElementNameProperty = DependencyProperty.Register("ElementName",
        typeof(string),
        typeof(ElementControl),
        new PropertyMetadata(new PropertyChangedCallback((s, e) => 
    { 
    //See Here
    ((ElementControl)s).UCText.Text = e.NewValue as string; 
    })));

    public string ElementName
    {
        get
        {
            return (string)base.GetValue(ElementNameProperty);
        }
        set
        {
            base.SetValue(ElementNameProperty, value);
        }
    }
    #endregion
}