Set Binding property in Style in XAML C#

Question

I'm searching for a way to set the binding property UpdateSourceTrigger in a Style. Currently I'm setting it on every TextBox manually like this:

<TextBox Text="{Binding boundValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

What I want to do is something like this (But this obviously doesn't work):

<Window.Resources>
    <Style TargetType="{x:Type TextBox}">
        <Setter Property="Binding.UpdateSourceTrigger" Value="PropertyChanged" />
    </Style>
</Window.Resources>
<Grid>
    <TextBox Text="{Binding boundValue, Mode=TwoWay}"/>
</Grid>

score 2 · Accepted Answer · answered Jun 28 '17 at 12:30

Styles are meant for FrameworkElements (and derivated controls).

Binding is not a FrameworkElement.

Anyway you can create your own markup extension for setting Binding's properties that your need:

public class PropertyChangedBinding : Binding
{
    public PropertyChangedBinding(string path)
        : base(path)
    {
        UpdateSourceTrigger = System.Windows.Data.UpdateSourceTrigger.PropertyChanged;
    }

    public PropertyChangedBinding()
        : base()
    {
        UpdateSourceTrigger = System.Windows.Data.UpdateSourceTrigger.PropertyChanged;
    }
}

So in your XAML you can use {local:PropertyChangedBinding ...}.

That works very good. Thank you! – Romano Zumbé Jun 28 '17 at 12:37 — Romano Zumbé, Jun 28 '17 at 12:37
You are welcome @RomanoZumbé – Il Vic Jun 28 '17 at 12:39 — Il Vic, Jun 28 '17 at 12:39

Set Binding property in Style in XAML C#

1 Answers1