XMAL代码

<StackPanel Margin="5" Background="LightBlue">

<TextBox Margin="5" Height="50" x:Name="txtone"/>

<Button Margin="5" Height="40" Content="累计" Click="btn_Click"/>

</StackPanel>

User类

//继承通知事件这个接口

class User:INotifyPropertyChanged

{

//声明一个属性改变事件

public event PropertyChangedEventHandler PropertyChanged;

private double chengji;

public double ChengJi

{

get { return chengji; }

set

{

chengji = value;

if (PropertyChanged != null)

{

this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs("ChengJi"));

}

}

}

}

CS代码

public partial class MainWindow : Window

{

User u = new User();

public MainWindow()

{

InitializeComponent();

//----------------------------------写法1-------------------------------------------

//Binding binding = new Binding();

//数据源是User类

//binding.Source = u;

//路径是Chengji这个属性

//binding.Path=new PropertyPath("ChengJi");

//进行绑定，第一个参数是绑定的目标，就是你要往哪绑定，第二个参数三你要往目标的哪个属性上绑，第三个参数就就是说你要与哪个实例关联

//BindingOperations.SetBinding(this.txtone, TextBox.TextProperty, binding);

//----------------------------------写法2-------------------------------------------

this.txtone.SetBinding(TextBox.TextProperty, new Binding("ChengJi") { Source = u });

}

private void btn_Click(object sender, RoutedEventArgs e)

{

u.ChengJi += 1;

}

}