Question

My XAML:

<TextBox x:Name='myTextBox' .../> <MyExtender TargetTextBox=? .../> 

My C#:

MyExtender : UserControl {     public TargetTextBox { get; set; } } 

How do I set the TargetTextBox property in XAML?

Answer 1

You should be able to do:

<TextBox Name='tb'>Something</TextBox> <my:MyExtender TargetTextBox='{Binding ElementName=tb}' /> 

but this requires TargetTextBox to be a DependencyProperty. Change MyExtender.xaml.cs to:

 public partial class MyExtender : System.Windows.Controls.UserControl {     public MyExtender()     {         InitializeComponent();     }     public static readonly DependencyProperty TargetTextBoxPropery =          DependencyProperty.Register('TargetTextBox', typeof(TextBox), typeof(MyExtender));      public TextBox TargetTextBox     {         get { return (TextBox)GetValue(TargetTextBoxPropery); }         set { SetValue(TargetTextBoxPropery, value); }     }  } 

And you should be set.