WPF: How do I bind with this behavior?

Question

Here is an image to help clarify my question.

Three TextBoxes and a TextBlock. I want the TextBlock to mirror the contents of one TextBox, but, if I mouse over another TextBox the TextBlock will mirror the Text of that TextBox instead. Mousing over a TextBox is just an arbitrary way to choose one TextBox over another. I have one requirement though and that is that the TextBlock be bound to a VM property and never directly to the Text property of a TextBox.

Any help appreciated,
Thanks.

Answer 1

Hi,

Welcome to our Microsoft Q&A platform!

I think you better use MouseEnter event instead of IsMouseOver:

Xaml:

<TextBox  Height="20" Width="100" Margin="20" MouseEnter="TextBox_MouseEnter" />
            <TextBox  Height="20" Width="100" Margin="20" MouseEnter="TextBox_MouseEnter"/>
            <TextBox  Height="20" Width="100" Margin="20" MouseEnter="TextBox_MouseEnter"/>

C# code:

   private void TextBox_MouseEnter(object sender, MouseEventArgs e)
        {
           textBlock1.Text =(sender as TextBox).Text;
        }

Thanks.