如何在WPF中使用IValidatableObject显示错误信息？

public class MyModel : IValidatableObject
{
    public string Name { get; set; }
    public int Age { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        if (string.IsNullOrEmpty(Name))
        {
            yield return new ValidationResult("Name不能为空", new[] { "Name" });
        }

        if (Age < 18)
        {
            yield return new ValidationResult("年龄必须大于18", new[] { "Age" });
        }
    }
}

<Window.Resources>
    <ControlTemplate x:Key="ErrorTemplate">
        <DockPanel>
            <Border BorderBrush="Red" BorderThickness="1">
                <AdornedElementPlaceholder/>
            </Border>
            <TextBlock Foreground="Red" Margin="5,0,0,0" Text="{Binding [0].ErrorContent}"/>
        </DockPanel>
    </ControlTemplate>
</Window.Resources>

<TextBox Text="{Binding Name, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True, NotifyOnValidationError=True}">
    <Validation.ErrorTemplate>
        <ControlTemplate>
            <Border BorderBrush="Red" BorderThickness="1">
                <AdornedElementPlaceholder/>
            </Border>
        </ControlTemplate>
    </Validation.ErrorTemplate>
</TextBox>
<TextBlock Text="{Binding ElementName=myTextBox, Path=(Validation.Errors)[0].ErrorContent}"/>

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new MyModel();
    }
}