WPF( 数据验证）

<Window x:Class="TestOfValidationRules.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel >
        <TextBox x:Name="textBox1" Margin="5" />
        <Slider x:Name="slider1" Minimum="-10" Maximum="110" Margin="5" />
        
    </StackPanel>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace TestOfValidationRules
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            Binding binding = new Binding("Value")
            {
                 Source = this.slider1
            };

            binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
            
            RangeValidateRule rvr = new RangeValidateRule();
            rvr.ValidatesOnTargetUpdated = true;
            binding.ValidationRules.Add(rvr);

            binding.NotifyOnValidationError = true;
            this.textBox1.SetBinding(TextBox.TextProperty, binding);
            this.textBox1.AddHandler(Validation.ErrorEvent,new RoutedEventHandler(this.ValidationError));
        }

        void ValidationError(object sender, RoutedEventArgs e)
        {
            if (Validation.GetErrors(this.textBox1).Count > 0)
            {
                this.textBox1.ToolTip = Validation.GetErrors(this.textBox1)[0].ErrorContent.ToString();
            }
        }

        
    }

    public class RangeValidateRule:ValidationRule
    {
        public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
        {
            double d = 0;
            if (double.TryParse(value.ToString(),out d))
            {
                if(d >= 0 && d <= 100)
                {
                    return new ValidationResult(true,null);
                }
            }

            return new ValidationResult(false,"Validation Failed !!!");
        }
    }
}