一、概述

依赖属性指属性没有值，通过Binding从数据源中获取值

二、使用

2.1 依赖属性 Register

    public class Student0:DependencyObject
    {
        public string Name
        {
            get {
                return (string)GetValue(NameProperty);
            }
            set
            {
                SetValue(NameProperty, value);
            }
        }

        public static readonly DependencyProperty NameProperty = DependencyProperty.Register("Name", typeof(string), typeof(Student0));
        public BindingExpressionBase SetBinding(DependencyProperty dp, BindingBase bind)
        {
            return BindingOperations.SetBinding(this,dp,bind);
        }
    }

  stu = new Student0();
            Binding bind = new Binding("Text") { Source=textBox1};

            stu.SetBinding(Student0.NameProperty, bind);
           
            textBox2.SetBinding(TextBox.TextProperty, new Binding("Name") { Source=stu});

2.2 附加属性 RegisterAttached

    public class Human:DependencyObject
    {
       
    }

    public class School : DependencyObject
    {

        public static int GetGrade(DependencyObject obj)
        { 
            return (int)obj.GetValue(GradeProperty);
        }

        public static void SetGrade(DependencyObject obj, int value)
        {
            obj.SetValue(GradeProperty, value);
        }

        // Using a DependencyProperty as the backing store for Grade.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty GradeProperty =
            DependencyProperty.RegisterAttached("Grade", typeof(int), typeof(School), new UIPropertyMetadata(0));
        
    }

            Human human = new Human();
            School.SetGrade(human, 15);
            int grade = School.GetGrade(human);
            MessageBox.Show(grade.ToString());