Попробуйте этот код
конвертер
/// <summary>
/// The actual implementation of InverseBooleanVisibilityConverter
/// </summary>
internal class RangeConverter : IValueConverter
{
/// <summary>
/// Converters the Boolean value to Visibility inversely
/// </summary>
/// <param name="value">The Boolean value</param>
/// <param name="targetType">The target value</param>
/// <param name="parameter">The parameter</param>
/// <param name="culture">The culture of the value</param>
/// <returns>Returns the a Visibility Type Value</returns>
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
int j;
Int32.TryParse(value as string, out j);
if (j <= 10)
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// Converters the Visibility value to Boolean inversely
/// </summary>
/// <param name="value">The Boolean value</param>
/// <param name="targetType">The target value</param>
/// <param name="parameter">The parameter</param>
/// <param name="culture">The culture of the value</param>
/// <returns>Returns the a Visibility Type Value</returns>
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
XAML
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:cef="clr-namespace:WpfApplication1"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
Title="Window1" x:Name="testWindow" Height="500" Loaded="Window_Loaded" Width="300" >
<Window.Resources>
<cef:RangeConverter x:Key="rangeConv"></cef:RangeConverter>
</Window.Resources>
<Grid >
<StackPanel x:Name="stk">
<TextBlock Text="1" Width="100">
<TextBlock.Style>
<Style TargetType="{x:Type TextBlock}">
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Text, Converter={StaticResource ResourceKey=rangeConv}}" Value="True">
<Setter Property="TextBlock.Foreground" Value="LimeGreen" />
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>
</StackPanel>
</Grid>
</Window>