<Window
x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:WpfApplication1="clr-namespace:WpfApplication1"
Title="WPF" Height="100" Width="280">
<Window.Resources>
<Style
x:Key="textBoxInErrorStyle"
TargetType="{x:Type TextBox}" >
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="true">
<Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static
RelativeSource.Self},
Path=(Validation.Errors)[0].ErrorContent}"/>
</Trigger>
</Style.Triggers>
<Setter Property="Validation.ErrorTemplate">
<Setter.Value>
<ControlTemplate>
<DockPanel DockPanel.Dock="Right">
<AdornedElementPlaceholder/>
<Image Source="Error.png" Width="16" Height="16"
ToolTip="{Binding Path=AdornedElement.ToolTip, RelativeSource={RelativeSource
Mode=FindAncestor,
AncestorType={x:Type Adorner}}}"/>
</DockPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<StackPanel>
<Slider Name="slider" Margin="4" Interval="1" TickFrequency="1" IsSnapToTickEnabled="True" Minimum="0" Maximum="100"/>
<StackPanel Orientation="Horizontal" >
<TextBox Style="{StaticResource textBoxInErrorStyle}" HorizontalAlignment="Center" >
<TextBox.Text>
<Binding ElementName="slider" Path="Value" Mode="TwoWay"
UpdateSourceTrigger="PropertyChanged" >
<Binding.ValidationRules>
<WpfApplication1:PercentageRule/>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
</StackPanel>
</StackPanel>
</Window>
//File:Window.xaml.cs
using System.Globalization;
using System.Windows.Controls;
namespace WpfApplication1
{
public class PercentageRule : ValidationRule
{
public override ValidationResult Validate(object value,CultureInfo cultureInfo)
{
string stringValue = value as string;
if(!string.IsNullOrEmpty(stringValue))
{
double doubleValue;
if(double.TryParse(stringValue, out doubleValue))
{
if(doubleValue >= 0 && doubleValue <= 100)
{
return new ValidationResult(true, null);
}
}
}
return new ValidationResult(false, "Must be a number between 0 and 100");
}
}
}
