WPF自定义DependencyProperty通知更改

Question

我有一个名为MyComponent的类,它有一个DependencyProperty caled BackgroundProperty.

public class MyComponent
{
    public MyBackground Background
    {
        get { return (MyBackground)GetValue(BackgroundProperty); }
        set { SetValue(BackgroundProperty, value); }
    }
    public static readonly DependencyProperty BackgroundProperty =
        DependencyProperty.Register("Background", typeof(MyBackground),
            typeof(MyComponent), new FrameworkPropertyMetadata(default(MyBackground), new PropertyChangedCallback(OnPropertyChanged)));
}

MyBackground是一个派生自DependencyObject的类,它有一些DependencyProperties.

public class MyBackground : DependencyObject
{
    public Color BaseColor
    {
        set { SetValue(BaseColorProperty, value); }
        get { return (Color)GetValue(BaseColorProperty); }
    }
    public static readonly DependencyProperty BaseColorProperty =
        DependencyProperty.Register("BaseColor", typeof(Color),
            typeof(MyBackground ), new UIPropertyMetadata(Colors.White));

    [...]
}

现在,我想要的是当MyBackground中的属性发生更改时,MyComponent将被通知MyBackground已更改,并且名为OnPropertyChanged的PropertyChangedCallback将被调用.

Answer 1

听起来您想使用 DependencyPropertyDescriptor 和 AddValueChanged。

这是一篇关于它的文章：http://www.codeproject.com/Articles/34741/Change-Notification-for-Dependency-Properties.aspx

..可能还有更好的实现：http://agsmith.wordpress.com/2008/04/07/propertydescriptor-addvaluechanged-alternative/