class Student
{private string name;public string Name{get{return name;}set{name = value;}}
}

System.ComponentModel下的INotifyPropertyChanged接口就行了

class Student：INotifyPropertyChanged
{public event PropertyChangedEventHandler PropertyChanged;private string name;public string Name{get{return name;}set{name = value;//在set中激发 PropertyChanged事件if(this.PropertyChanged!=null){this.PropertyChanged.Invoke(this,new PropertyChangedEventArgs("Name"));}}}}

<Window x:Class="Binding1.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"><StackPanel><TextBox x:Name="txtBoxName" BorderBrush="Black" Margin="5"></TextBox><Button Content="AddAge" Margin="5" Click="Button_Click"></Button></StackPanel>
</Window>

public partial class MainWindow : Window{Student stu;public MainWindow(){InitializeComponent();//准备数据源stu = new Student();//把stu.Name作为Binding的数据源Binding binding = new Binding();binding.Source = stu;binding.Path = new PropertyPath("Name");//使用Binding连接源和目标，把stu的Name属性值联系到一个叫做"txtBoxName"的TextBox上去BindingOperations.SetBinding(this.txtBoxName, TextBox.TextProperty, binding);}private void Button_Click(object sender, RoutedEventArgs e){stu.Name += "屎兔子";}}

public Window1()
{InitializeComponent();this.txtBoxName.SetBinding(TextBox.TextProperty,new Binding("Name"){Source = stu = new Student()});
}

private void Button_Click(object sender, RoutedEventArgs e)
{stu.Name += "屎兔子";
}