WPF-UserControl Binding does not Work when colsing a Dialog

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Hi!

I'm new in WPF, so please sorry about my inexperience, I hope, my Question is not too stupid, but I have a problem:
I wrote a simple WPF-UserControl, which has a Lable, an Icon and a TextBox. And of course, the text of the Textbox should be bindable in both directions. It works fine when loading the control, but not, when closing it. I think I forgot to write a peace of code that sends the entered Text back to the Property Text and forces a Changed Event to outside, but I don't know how.
Can anyone help me?

Here is my Code-Behind File:

C#

public partial class TextCtrl : UserControl
{
...

public static readonly DependencyProperty TextProperty =
         DependencyProperty.Register("Text", typeof(string), typeof(TextCtrl),
         new FrameworkPropertyMetadata("", FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,  OnTextChanged));

       public string Text
       {
           get { return (string)GetValue(TextProperty); }
           set { SetValue(TextProperty, value); }
       }
       private static void OnTextChanged(DependencyObject sender, DependencyPropertyChangedEventArgs eventArgs)
       {
           TextCtrl tx = (TextCtrl)sender;
           tx.txtText.Text = eventArgs.NewValue.ToString();
       }

In the XAML where I use the Control, I Set a Binding to the Property Text:

XML

<src:TextCtrl Text="{Binding Path=.Strasse}"/>

Strasse is a Property from my ViewModel.

Thanks a lot for helping me, br Alex Hahn

Posted 20-Apr-10 5:20am

AlexH Immobilien.net

Updated 20-Apr-10 22:32pm

Tony Richards

v3

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#realJSOP · Answer 1 · 2010-04-21T01:51:00

Solution 1

Looks to me like you forgot to put Mode=TwoWay into your XAML snippet.

Posted 21-Apr-10 1:51am

#realJSOP

Updated 21-Apr-10 1:52am

v2

AlexH Immobilien.net · Answer 2 · 2010-04-21T02:17:00

Hi!

Thanks for your Answer!
The Mode is TwoWay by default, but also when he is set explicit, it does not work!
Of course not, because the Text entered is in TextCtrl.txtText.Text, the binding is set on TextCtrl.Text!
When Loading the Control, TextCtrl.txtText.Text is set in in OnTesxtChange(..).
What i need is a possibility to get the Text from TextCtrl.txtText.Text into TextCtrl.Text.

At the Moment I do this with an EventHandler on OnTextChanged like:

<pre lang="cs">public TextCtrl()
{
InitializeComponent();
txtText.TextChanged += new TextChangedEventHandler(txtText_TextChanged);
}
void txtText_TextChanged(object sender, TextChangedEventArgs e)
{
if (sender is TextBox)
{
if (this.Text.CompareTo((sender as TextBox).Text) != 0)
{
this.Text = (sender as TextBox).Text;
}
}
}</pre>

but I think, there is a better solution. Anny Idea?

br from Austria
Alex

AlexH Immobilien.net · Answer 3 · 2010-04-29T04:30:00

Solution 3

Hi again!

I found the solution: I forgot to set the DataContext of my TextBox ;P !

In the Constructor I added this:
<pre lang="cs">
public TextCtrl()
{
InitializeComponent();
TxtText.DataContext = this;
}
</pre>

Now it works fine!

Good luck with WPF to all and best regards
Alex

Posted 29-Apr-10 4:30am