WPFS数据绑定（要是后台类对象的属性值发生改变，通知在“client界面与之绑定的控件值”也发生改变须要实现INotitypropertyChanged接口）

MainWindow.xaml

<Window x:Class="WpfApplication1.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" Loaded="Window_Loaded">

    <Grid>

        <TextBox Text="{Binding Name}"  Height="23" HorizontalAlignment="Left" Margin="122,68,0,0" Name="txtName" VerticalAlignment="Top" Width="120" />

        <TextBox Text="{Binding Age}" Height="23" HorizontalAlignment="Left" Margin="122,124,0,0" Name="txtAge" VerticalAlignment="Top" Width="120" />

        <TextBlock Height="23" HorizontalAlignment="Left" Margin="82,71,0,0" Name="textBlock1" Text="姓名" VerticalAlignment="Top" />

        <TextBlock Height="23" HorizontalAlignment="Left" Margin="82,127,0,0" Name="textBlock2" Text="年龄" VerticalAlignment="Top" />

        <Button Content="Age++" Height="23" HorizontalAlignment="Left" Margin="262,71,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />

        <Button Content="显示Age" Height="23" HorizontalAlignment="Left" Margin="262,124,0,0" Name="button2" VerticalAlignment="Top" Width="75" Click="button2_Click" />

    </Grid>

</Window>

MainWindow.xaml.cs

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 WpfApplication1

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class MainWindow : Window

    {

        Person p1 = new Person();

        public MainWindow()

        {

            InitializeComponent();

        }

        private void Window_Loaded(object sender, RoutedEventArgs e)

        {

            p1.Name = "李大钊";

            p1.Age = 28;

            txtName.DataContext = p1;

            txtAge.DataContext = p1;

        }

        private void button1_Click(object sender, RoutedEventArgs e)

        {

            p1.Age++;

        }

        private void button2_Click(object sender, RoutedEventArgs e)

        {

            MessageBox.Show((p1.Age).ToString());

        }

    }

}

Model

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ComponentModel;

namespace WpfApplication1

{

    /// <summary>

    /// INotifyPropertyChanged接口是向client发出某一属性值已经更改的通知

    /// INotifyPropertyChanged是.net内置的接口，数据绑定DataContext是否实现了INotityPropertyChanged接口，假设实现了，就会监听PropertyChanged得知属性的变化

    /// 假设要求后台对象的值发送改变，界面的值也跟着变，则须要实现INotityPropertyChanged接口。而且在对象属性值变化后触发事件

    /// 假设说后台对象的值会不变，则没有必要实现这个接口

    /// </summary>

    public class Person:INotifyPropertyChanged

    {

        private string name;

        public string Name

        {

            get

            {

                return name;

            }

            set

            {

               this.name = value;

               if (PropertyChanged != null)

               {   //假设Name属性发生了改变，则触发这个事件

                   PropertyChanged(this, new PropertyChangedEventArgs("Name"));

               }

            }

        }

        private int age;

        public int Age

        {

            get

            {

                return age;

            }

            set

            {

                this.age = value;

                //假设有人（数据绑定的对象来监听的）监听这个事件（假设有人监听就是不等于null,假设没人监听这个事件就等于null）

                if (PropertyChanged != null)

                {

                    //假设Age属性发生了改变，则触发这个事件

                    PropertyChanged(this,new PropertyChangedEventArgs("Age"));

                }

            }

        }

        public event PropertyChangedEventHandler PropertyChanged;

    }

}