1：项目结构图
2：控件SilverlightControl1
前台：
后台：
public partial class SilverlightControl1 : UserControl{ public SilverlightControl1() { InitializeComponent(); } public static readonly DependencyProperty StudentProperty = DependencyProperty.Register("Student", typeof(Student), typeof(SilverlightControl1), new PropertyMetadata(new PropertyChangedCallback(xxx))); public Student Student { get { return (Student)GetValue(StudentProperty); } set { SetValue(StudentProperty, value); } } static void xxx(DependencyObject d, DependencyPropertyChangedEventArgs e) { MessageBox.Show("sss"); }} |
3：调用方
前台：
后台：
public partial class MainPage : UserControl{ public MainPage() { InitializeComponent(); } Student student1 = new Student() { StudentName = "hzh" + DateTime.Now.ToFileTime(), Age = 99 }; Student student2 = new Student() { StudentName = "lmj" + DateTime.Now.ToFileTime(), Age = 99 }; Student student3 = new Student() { StudentName = "lh" + DateTime.Now.ToFileTime(), Age = 99 }; //初始化 private void Button_Click(object sender, RoutedEventArgs e) { //采用非绑定机制 uc1.Student = student1; //采用非绑定机制，对DataContext赋值 uc2.DataContext = student2; //采用绑定机制 uc3.DataContext = student3; } //改Model值 private void Button_Click1(object sender, RoutedEventArgs e) { student1.StudentName = "lmj" + DateTime.Now.ToString(); student1.Age = 90; student2.StudentName = "hzh" + DateTime.Now.ToString(); student2.Age = 90; student3.StudentName = "hzh" + DateTime.Now.ToString(); student3.Age = 90; } //更换Model private void Button_Click_1(object sender, RoutedEventArgs e) { student1 = new Student() { StudentName = "hzh" + DateTime.Now.ToFileTime(), Age = 99 }; student2 = new Student() { StudentName = "lmj" + DateTime.Now.ToFileTime(), Age = 99 }; student3 = new Student() { StudentName = "lh" + DateTime.Now.ToFileTime(), Age = 99 }; }} |
4：结论
无论是第一种方式，还是第三种方式，都能触发PropertyChangedCallback，而如果调用采用第二种方式，则不会触发PropertyChangedCallback。
