依赖属性的强制转换加回调，后期自己再改

using System;
using System.Collections.Generic;
using System.Diagnostics;
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.Shapes;namespace WpfWebBrowser
{/// <summary>/// Interaction logic for UriWindow.xaml/// </summary>public partial class UriWindow : Window{#region UriFrameworkPropertyMetadata frmate = new FrameworkPropertyMetadata();/// <summary>/// Uri Dependency Property/// </summary>public static readonly DependencyProperty UriProperty =DependencyProperty.Register ("Uri", typeof (Uri), typeof (UriWindow),new FrameworkPropertyMetadata (new Uri("http://www.baidu.com"), PropertyChanged, CoerceValue), ValidateValue);/// <summary>/// Gets or sets the Uri property.  This dependency property/// indicates ..../// </summary>public Uri Uri{get { return (Uri) GetValue (UriProperty); }set{SetValue (UriProperty, value);}}//属性改变static void PropertyChanged(DependencyObject dobj, DependencyPropertyChangedEventArgs e){Debug.WriteLine(String.Format("PropertyChanged - 属性：{0} 新值：{1} 旧值：{2}", e.Property.Name, e.NewValue, e.OldValue));}//强制转换static object CoerceValue(DependencyObject dobj, object newValue){Debug.WriteLine(String.Format("CoerceValue - {0}", newValue));if (newValue.ToString().StartsWith("http://")){return newValue;}else{return new Uri(@"http://" + newValue.ToString());}// return newValue;}//验证static bool ValidateValue(object obj){Debug.WriteLine(String.Format("ValidateValue - {0}", obj));return true;}#endregionpublic UriWindow(){InitializeComponent();frmate.CoerceValueCallback = new CoerceValueCallback(CoerceValue);}private void btn_Ok_Click (object sender, RoutedEventArgs e){this.DialogResult = true;this.Close();}private void btn_Cancel_Click (object sender, RoutedEventArgs e){this.Close();}}
}