Binding to double field with validation

Question

I\'m trying to bind TextBox to double property of some object with UpdateSourceTrigger=PropertyChanged. The goal is to immediately dur

Answer 1

The behavior of binding float values to a textbox has been changed from .NET 4 to 4.5. With .NET 4.5 it is no longer possible to enter a separator character (comma or dot) with ‘UpdateSourceTrigger = PropertyChanged’ by default.

Microsoft says, this (is) intended

If you still want to use ‘UpdateSourceTrigger = PropertyChanged’, you can force the .NET 4 behavior in your .NET 4.5 application by adding the following line of code to the constructor of your App.xaml.cs:

public App()  
{
    System.Windows.FrameworkCompatibilityPreferences
               .KeepTextBoxDisplaySynchronizedWithTextProperty = false;   
}

(Sebastian Lux - Copied verbatim from here)