WPF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

 

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{    /// 
    /// MainWindow.xaml 的交互逻辑    /// 
    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{    /// 
    /// 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    /// 
    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;            }}