How to get Dependency-Object and -Property for Usercontrol in VB and WPF?

Question

With VB and WPF I build a Usercontrol "ToggleSwitch". Want to bind it's IsChecked-Property to another signal as I did with Checkbox.
How to get Dependency-Object and Dependency-Property for that in VB and WPF?

Thanks

Answer 1

Hi,
you can register static (shared) property like in following demo:

XAML UserControl:

<UserControl x:Class="Window088ToggleSwitch"  
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"   
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"   
             xmlns:local="clr-namespace:WpfControlLibrary1"  
             mc:Ignorable="d"   
             d:DesignHeight="450" d:DesignWidth="800">  
  <StackPanel x:Name="stp">  
    <CheckBox Content="Binded IsChecked" IsChecked="{Binding IsChecked}" IsEnabled="False"/>  
  </StackPanel>  
</UserControl>  

CodeBehind UserControl:

Public Class Window088ToggleSwitch  
  
  Public Sub New()  
  
    ' This call is required by the designer.  
    InitializeComponent()  
  
    ' Add any initialization after the InitializeComponent() call.  
    stp.DataContext = Me  
  End Sub  
  
  Public Shared ReadOnly IsCheckedProperty As DependencyProperty =  
          DependencyProperty.RegisterAttached("IsChecked", GetType(Boolean),  
            GetType(Window088ToggleSwitch), New PropertyMetadata(Nothing))  
  
  Public Shared Function GetIsChecked(obj As DependencyObject) As Boolean  
    Return CType(obj.GetValue(IsCheckedProperty), Boolean)  
  End Function  
  
  Public Shared Sub SetIsChecked(obj As DependencyObject, value As Boolean)  
    obj.SetValue(IsCheckedProperty, value)  
  End Sub  
  
End Class  

XAML MainWindow:

<Window x:Class="Window088"  
        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"  
        xmlns:local="clr-namespace:WpfApp1"  
        xmlns:controls="clr-namespace:WpfControlLibrary1;assembly=WpfControlLibrary1"  
        mc:Ignorable="d"  
        Title="MainWindow" Height="450" Width="800">  
  <StackPanel>  
    <CheckBox x:Name="cb" Content="Main CheckBox"/>  
    <controls:Window088ToggleSwitch IsChecked="{Binding ElementName=cb, Path=IsChecked}" />  
  </StackPanel>  
</Window>  

Result:

Answer 2

Peter Fleischer thank you for the Demo. Got it run on my PC.
Thanks a lot!