传智播客--数据绑定--INotifyPropertyChanged（小白内容）

INotifyPropertyChanged一般在数据绑定的时候使用。

InotifyPropertyChanged是.net内置的接口，数据绑定时会检测DataContext是否实现了InotifyPropertyChanged，如果实现了，就会监听PropertyChanged，得知属性变化。

可以理解为InotifyPropertyChanged接口用于向客户端发出某一属性值已更改的通知。

类

class Person:INotifyPropertyChanged

    {

        private int age;

        public int Age

        {

            get

            {

                return age;

            }

            set

            {

                this.age = value;

                if (PropertyChanged != null)

                {

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

                }

            }

        }

        public event PropertyChangedEventHandler PropertyChanged;

    }

.cs文件

 public partial class MainWindow : Window

    {

        private Person p = new Person();

        public MainWindow()

        {

            InitializeComponent();

        }

        private void Button_Click(object sender, RoutedEventArgs e)

        {

            p.Age++;

        }

        private void Window_Loaded(object sender, RoutedEventArgs e)

        {

            p.Age = ;

            txtAge.DataContext = p;

        }

    }

xaml文件

<TextBox Name="txtAge" HorizontalAlignment="Left" Height="" Margin="82,39,0,0" TextWrapping="Wrap" Text="{Binding Age}" VerticalAlignment="Top" Width=""/>

<Button Content="Age++" HorizontalAlignment="Left" Margin="271,39,0,0" VerticalAlignment="Top" Width="" Click="Button_Click"/>

这样点击button可以实现textbox里的数字自增。