C#_wpf_userinput_数据绑定_后台对象改变，界面数据也变化

<!--MainWindow.xaml-->
    <Window x:Class="UserStore.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>
        <!--数据绑定 Text-->
        <TextBox Height="23" Text="{Binding Name}" HorizontalAlignment="Left" Margin="50,22,0,0" Name="txtName" VerticalAlignment="Top" Width="155" />
        <TextBox Height="23" Text="{Binding Age}" HorizontalAlignment="Left" Margin="50,70,0,0" Name="txtAge" VerticalAlignment="Top" Width="155" />
        <Button Content="年龄自增" Height="23" HorizontalAlignment="Left" Margin="50,164,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_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 UserStore
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private Person p1 = new Person();

        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            p1.Name = "Lee";
            p1.Age = 26;

            txtName.DataContext = p1;
            txtAge.DataContext = p1;
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            p1.Age++;
        }
    }
}

//Person.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;

namespace UserStore
{
    //class Person
    //{
    //    public int Age
    //    {
    //        get;
    //        set;
    //    }
    //    public string Name
    //    {
    //        get;
    //        set;
    //    }
    //}

    //内置的类，会监测INotifyPropertyChanged是否实现了，得知属性变化
    class Person : INotifyPropertyChanged
    {
        private int age;

        public int Age
        {
            get { return age; }
            set
            {
                this.age = value;
                if (PropertyChanged != null)
                {
                    //触发事件
                    PropertyChanged(this, new PropertyChangedEventArgs("Age"));
                }
            }
        }
        public string Name
        {
            get;
            set;
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }
}