Question

I want a textbox which will always applied a Converter on the binding. this way I don’t need to specified the converter, the style will already contains the converter to use.

This is what I already tried:

I have a ViewModel bound to view. I override the datacontext of a textbox within this view using a property of the view model. It allows me to use a generic style for my text box

I have the following Style:

<Style x:Key="DateTimeTextBox" TargetType="TextBox">
    <Setter Property="ToolTipService.ShowDuration" Value ="40000"/>
    <Setter Property="Text" Value ="{Binding Path=.,Converter={StaticResource myConverter},UpdateSourceTrigger=PropertyChanged}"/> 
    <Style.Triggers>
      <Trigger Property="Validation.HasError" Value="true">
        <Setter Property="ToolTip" Value="Unknown date format"/>
      </Trigger>
    </Style.Triggers>
</Style>

In the view I want to have the following text box bound on the porperty DateTimeValueToBind instead of the whole view model:

<TextBox Style="{StaticResource DateTimeTextBox}" DataContext="{Binding DateTimeValueToBind}"/>

The property DateTimeValueToBind is displayed properly in the textbox however it’s not bound anymore (when I modified it, the viewmodel property is not changed)

I tried to add the Mode=TwoWay in the binding options but It did not change anything.

Could explain why the DateTimeValueToBind property is not bound anymore in this context?

Thanks in advance

Answer 1

Leave the DataContext, bind the Text to DateTimeValueToBind (move the binding from the DataContext to Text). You should never set such a binding in a style; if the path is . you cannot bind TwoWay. (And what did you save anyway? You even have more to write as "DataContext" is longer than "Text".)