How to access parent's DataContext from a UserControl

Question

I need to access the container\'s DataContext from a UserControl (a grid containing textboxes and a listbox: I need to insert items in this list box) that I created in WPF:

Answer 1

Add this BindingProxy class to your project:

using System.Windows;

namespace YourNameSpace
{
    /// 

    /// Add Proxy  to Resources
    /// Bind like    
    /// 
    public class BindingProxy : Freezable
    {
        protected override Freezable CreateInstanceCore()
        {
            return new BindingProxy();
        }

        public object Data
        {
            get { return (object)GetValue(DataProperty); }
            set { SetValue(DataProperty, value); }
        }

        public static readonly DependencyProperty DataProperty = DependencyProperty.Register("Data", typeof(object), typeof(BindingProxy));
    }
}

1. Add the BindingProxy to your UserControl's resources.
2. Set the 'Data' property of the BindingProxy to whatever you need, e.g. search for a parent Window. Data="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}},Path=DataContext}" If you needed something more complex you could use a custom converter.

Now you have access to that parent's DataContext: {Binding Data.MyCommand, Source={StaticResource BindingProxy}}

    
        
    
    
        Execute My Command