wpf 自定义依赖性属性 作用之一 对数据绑定的支持

依赖属性：定义，声明，注册 

依赖属性，在数据绑定中，数据绑定，分为源对象（数据源）和目标对象（显示数据）。

只有源对象为依赖对象，属性为依赖属性时，该属性才会在属性发生变化时，通知目标对象进行数据更改。

依赖属性，具有对目标对象更改通知的功能。

XAML

<StackPanel>
<TextBox Style="{StaticResource textStyle}" Height="37" Name="textBox1" FontSize="26" Margin="5" Width="439" />
<TextBox Style="{StaticResource textStyle}" Height="37" Name="textBox2" FontSize="26" Margin="5" Width="439" />
<Button Content="Button" Height="39" Name="button1" Width="131" Click="button1_Click" />
</StackPanel>

.CS

namespace WPF_VIP_Characters
{
/// <summary>
/// Interaction logic for DependProperty.xaml
/// </summary>
public partial class DependProperty : Window
{
public DependProperty()
{
InitializeComponent();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
//Student stu = new Student();
//stu.SetValue(Student.NameProperty, textBox1.Text);
//textBox2.Text = (string)stu.GetValue(Student.NameProperty);

Student stu = new Student();

Binding binding = new Binding("Text") { Source = textBox1 };
BindingOperations.SetBinding(stu, Student.NameProperty, binding);

Binding binding2 = new Binding("Name") { Source = stu };
BindingOperations.SetBinding(textBox2, TextBox.TextProperty, binding2);

}
}

class Student:DependencyObject
{
//CLR属性进行封装
public string Name
{
get { return (string)GetValue(NameProperty); }
set { SetValue(NameProperty, value); }
}
//定义依赖属性/注册
public static readonly DependencyProperty NameProperty = DependencyProperty.Register("Name", typeof(string), typeof(Student));
}

}