Mastering Visual Studio 2017

Data trigger

As the name suggests, the data trigger applies a property value to perform a set of actions on the data that has been bound to the UI element. This is represented by the <DataTrigger> element.

Here's an example of writing a data trigger to a UI element:

<StackPanel Orientation="Horizontal"  
   HorizontalAlignment="Center"  
   VerticalAlignment="Center"> 
   <CheckBox Name="chkError" Content="Error"  
     VerticalAlignment="Center"/> 
     <TextBlock Margin="20, 0" FontSize="50"> 
       <TextBlock.Style> 
         <Style TargetType="TextBlock"> 
           <Setter Property="Text" Value="Pass" /> 
           <Setter Property="Foreground" Value="Green" /> 
           <Style.Triggers> 
             <DataTrigger Binding="{Binding ElementName=chkError,  Path=IsChecked}" Value="True"> <Setter Property="Text" Value="Fail" ...