Binding in TextBoxes do not work

I created a simple TextBox with a binding in a pure WPF-Window

<TextBox Name="MyTextBox"
   开发者_开发百科      Focusable="True" Width="150"
         Text="{Binding MyText, UpdateSourceTrigger=PropertyChanged}"</TextBox>

My problem is, that underlaying string property 'MyText' is not updated in any case. If I type a space character, the property is updated. If I paste text through the clipboard into the TextBox, the property MyText is updated. But if I type in any other character, nothing happens. I registered a event handler for TextChanged for debug purposes. The event only occures for the space character and the paste operation, but for no other characters.

Some words about my enviroment: The WPF-Window can be stripped down to just this TextBox. I open this Window from inside a DLL. The complete project was targeted to .Net2, now, due to WPF, to Framework 3.5. I don't know how to make this more simple to find the problem.

You mentioned Framework 2.0. If your application bases on Windows Forms, you should keep in mind some interop topics. Have you tried the following before opening the window:

System.Windows.Forms.Integration.ElementHost.EnableModelessKeyboardInterop(YourWindowObject)

Otherwise try to open your window from a WPF-Application.

By default, the mode of a binding is one way. This means it loads from a property by default, but won't set. Add "Mode=Twoway" in your binding (see code snippet) and see if this resolves your issue.

<TextBox Name="MyTextBox"
     Focusable="True" Width="150"
     Text="{Binding MyText, Mode=Twoway, UpdateSourceTrigger=PropertyChanged}">
</TextBox>