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。