Set or change Converter using a trigger? - wpf

Question

Here is my TextBox with a converter:
<TextBox Text="{Binding TimbraturaSelezionata.OrarioMinuti, Converter={StaticResource Minuti2HHmmConverter}}" Margin="5,0"/>
I searched for a way to set or change the converter only when it is effectively needed.
In fact I would like to put that TextBox inside a general purpose User Control and apply the converter only when a specific condition is met.
The only solution that came to my mind is to use a ContentControl and use two DataTrigger to set its template, one with the Converter inside the TextBox, and one without. I would hope finding a clearer way to achieve my goal.
Thanks for any suggestions.

Answer 1

Since you're set on a trigger. Here's an example. Hope it helps;
<TextBox x:Name="MyTextBox" Text="{Binding TimbraturaSelezionata.OrarioMinuti}" Margin="5,0">
<i:Interaction.Triggers>
<ei:DataTrigger Value="False"
Binding="{Binding YourCondition, ElementName=MyTextBox}">
<ei:ChangePropertyAction PropertyName="Text"
Value="{Binding TimbraturaSelezionata.OrarioMinuti}" />
</ei:DataTrigger>
<ei:DataTrigger Value="True"
Binding="{Binding YourCondition, ElementName=MyTextBox}">
<ei:ChangePropertyAction PropertyName="Text"
Value="{Binding TimbraturaSelezionata.OrarioMinuti, Converter={StaticResource Minuti2HHmmConverter}}" />
</ei:DataTrigger>
</i:Interaction.Triggers>
</TextBox>

Answer 2

Another working solution is the folowing:
<TextBox Width="100">
<TextBox.Style>
<Style TargetType="{x:Type TextBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding ValoreInMinuti}" Value="True">
<Setter Property="Background" Value="Red" />
<Setter Property="Text" Value="{Binding Quantita, Converter={StaticResource Minuti2HHmmConverter}}" />
</DataTrigger>
<DataTrigger Binding="{Binding ValoreInMinuti}" Value="False">
<Setter Property="Background" Value="Yellow" />
<Setter Property="Text" Value="{Binding Quantita}" />
</DataTrigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
Note that the Text property is set only via DataTrigger. In my specific case I had only two possibilities, one with the converter and one without it.