1:項目結構圖
2:控件SilverlightControl1
前臺:
后臺:
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:調用方
前臺:
后臺:
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) { //采用非綁定機制 uc1.Student = student1; //采用非綁定機制,對DataContext賦值 uc2.DataContext = student2; //采用綁定機制 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; } //更換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:結論
無論是第一種方式,還是第三種方式,都能觸發PropertyChangedCallback,而如果調用采用第二種方式,則不會觸發PropertyChangedCallback。
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