Why does data binding break in OneWay mode?

binding-mode, data-binding, wpf

Solution

Use `mode=TwoWay` and set the `UpdateSourceTrigger=Explicit`.

Problem

Here's a little XAML fragment. You will see ``` <StackPanel> <TextBox x:Name="txtValue">250</TextBox> <Slider x:Name="slide" Value="{Binding ElementName=txtValue, Path=Text, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}" Minimum="0" Maximum="500"></Slider> </StackPanel> ``` - when you change the textbox value, the slider updates - If you change the slider value explicitly, the previous behavior breaks a.k.a. stops working. If I remove the `Mode=OneWay` set directive, (defaults to two-way) everything works perfectly. Why is this happening?

Original source