【WPF】自定义类作为UserControl的依赖属性的binding有关问题！

【WPF】自定义类作为UserControl的依赖属性的binding问题！！！
定义一个类：

C# code

 public class Student : DependencyObject    {        public string Name        {            get { return (string)GetValue(NameProperty); }            set { SetValue(NameProperty, value); }        }        // Using a DependencyProperty as the backing store for Name.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty NameProperty =            DependencyProperty.Register("Name", typeof(string), typeof(Student));    }

定义一个UserControl：

C# code

public partial class UsercontrolBinding : UserControl    {        public UsercontrolBinding()        {            InitializeComponent();            stu = new Student();            stu.Name = "ABC";            tb1.SetBinding(TextBox.TextProperty, new Binding("Name") { Source = stu });            tb2.SetBinding(TextBlock.TextProperty, new Binding("TecName") { Source = this });        }        public Student stu        {            get { return (Student)GetValue(stuProperty); }            set { SetValue(stuProperty, value); }        }        // Using a DependencyProperty as the backing store for stu.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty stuProperty =            DependencyProperty.Register("stu", typeof(Student), typeof(UsercontrolBinding));        public string TecName        {            get { return (string)GetValue(TecNameProperty); }            set { SetValue(TecNameProperty, value); }        }        // Using a DependencyProperty as the backing store for TecName.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty TecNameProperty =            DependencyProperty.Register("TecName", typeof(string), typeof(UsercontrolBinding));                    }

界面XAML：

XML code

<StackPanel>        <TextBox  x:Name="tb1" Text="demo"/>              <TextBlock x:Name="tb2" Text="demo"/>    </StackPanel>

然后在主程序中使用：
<l:UsercontrolBinding x:Name="ub1" />

主程序对应代码：

C# code

  public MainWindow()        {            InitializeComponent();stuB = new Student()            {                Name="Zhang",            }; TecName = "TecYang"; ub1.SetBinding(UsercontrolBinding.TecNameProperty, new Binding("TecName") { Source = this });ub1.SetBinding(UsercontrolBinding.stuProperty, new Binding("stuB") { Source = this });}public string TecName        {            get { return (string)GetValue(TecNameProperty); }            set { SetValue(TecNameProperty, value); }        }        // Using a DependencyProperty as the backing store for TecName.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty TecNameProperty =            DependencyProperty.Register("TecName", typeof(string), typeof(MainWindow));public Student stuB        {            get { return (Student)GetValue(stuBProperty); }            set { SetValue(stuBProperty, value); }        }        // Using a DependencyProperty as the backing store for stuB.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty stuBProperty =            DependencyProperty.Register("stuB", typeof(Student), typeof(MainWindow)); 
 

TecName 是string类型，可以binding成功，而Student 类型的stuB却不可以binding成功？ 这是为什么呢？应该怎么做！

[解决办法]
问题解决？
[解决办法]
LZ，神马意思，代码看不明白呢

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