Binding not working

Question

I have two textboxes, the first of them I've bound to a tabControl's Item's Header. I did it in the code behind.

The problem is that the binding succeeds only in the first time.

XAML:

  <StackPanel>
    <TabControl x:Name="tabcontrol">
        <TabControl.Items>
            <TabItem>
            </TabItem>
        </TabControl.Items>
    </TabControl>
    <TextBox Text="5" x:Name="txtbox"></TextBox>
    <TextBox Text="dsfdf"></TextBox>
</StackPanel>

Code Behind:

 public partial class Window4 : Window 
 {
      public Window4() 
      {
         InitializeComponent();
         var b = new Binding { Mode = BindingMode.OneWay, Source = txtbox.Text };
         ((TabItem)tabcontrol.Items[0]).SetBinding(HeaderedContentControl.HeaderProperty, b);
      }
   }

Kent Boogaart Kent Boogaart · Accepted Answer · 2010-11-07T15:56:46

Change the Source to the TextBox, and set the Path to Text:

var b = new Binding { Mode = BindingMode.OneWay, Source = txtbox, Path = "Text" };
((TabItem)tabcontrol.Items[0]).SetBinding(HeaderedContentControl.HeaderProperty, b);

Otherwise, you've set the source to the current value of txtbox.Text, and any changes to it won't be picked up because the source (the string) does not support change notifications.

Binding not working

1 Answers