How to get DataTemplate.DataTrigger to check for greater than or less than?

Question

The following DataTemplate.DataTrigger makes the age display red if it is equal to 30.

How do I make the age display red if it is greater than 30?

<DataTemplate DataType="{x:Type local:Customer}">     <Grid x:Name="MainGrid" Style="{StaticResource customerGridMainStyle}">         <Grid.ColumnDefinitions>             <ColumnDefinition Width="100"/>             <ColumnDefinition Width="150"/>         </Grid.ColumnDefinitions>         <Grid.RowDefinitions>             <RowDefinition/>             <RowDefinition/>             <RowDefinition/>         </Grid.RowDefinitions>         <TextBlock Grid.Column="0" Grid.Row="0" Text="First Name" Margin="5"/>         <TextBlock Grid.Column="1" Grid.Row="0" Text="{Binding FirstName}" Margin="5"/>         <TextBlock Grid.Column="0" Grid.Row="1" Text="Last Name" Margin="5"/>         <TextBlock Grid.Column="1" Grid.Row="1" Text="{Binding LastName}" Margin="5"/>         <TextBlock Grid.Column="0" Grid.Row="2" Text="Age" Margin="5"/>         <TextBlock x:Name="Age" Grid.Column="1" Grid.Row="2" Text="{Binding Age}" Margin="5"/>     </Grid>      <DataTemplate.Triggers>         <DataTrigger Binding="{Binding Path=Age}">             <DataTrigger.Value>30</DataTrigger.Value>             <Setter TargetName="Age" Property="Foreground" Value="Red"/>          </DataTrigger>     </DataTemplate.Triggers>  </DataTemplate> 

Answer 1

You could create an IValueConverter, which converts an integer to a boolean based on the CutOff. Then use DataTrigger.Value of True (or False, depending on what you are returning).

WPF DataTriggers are strictly equality comparers if I remember correctly.

So something similar to:

public class CutoffConverter : IValueConverter {     public object Convert(object value, Type targetType, object parameter, CultureInfo culture) {         return ((int)value) > Cutoff;     }      public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) {         throw new NotImplementedException();     }      public int Cutoff { get; set; } } 

Then use the following XAML.

<Window.Resources>     <myNamespace:CutoffConverter x:Key="AgeConverter" Cutoff="30" /> </Window.Resources>  <DataTemplate.Triggers>     <DataTrigger Binding="{Binding Path=Age,                                    Converter={StaticResource AgeConverter}}">         <DataTrigger.Value>true</DataTrigger.Value>         <Setter TargetName="Age" Property="Foreground" Value="Red"/>      </DataTrigger> </DataTemplate.Triggers>