小编mar*_*yxl的帖子

我有一个使用DependencyProperties(或INotifyPropertyChanged)的ViewModel,它具有非常简单的复合类型的属性,如System.Windows.Point.简单的复合类型不使用DependencyProperties或INotifyPropertyChanged,它意图保持这种方式(它不受我的控制).

我现在要做的是创建与Point的X和Y属性绑定的双向数据,但是当其中一个被更改时,我希望替换整个Point类,而不是只更新成员.

代码示例仅用于说明:

<Window ...>
    <StackPanel>
        <TextBox Text="{Binding TestPoint.X, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:MainWindow}}, StringFormat=\{0:F\}}"/>
        <TextBox Text="{Binding TestPoint.Y, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:MainWindow}}, StringFormat=\{0:F\}}"/>
        <!-- make following label update based on textbox changes above -->
        <Label Content="{Binding TestPoint, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:MainWindow}}}"/>
    </StackPanel>
</Window>

代码隐藏:

public partial class MainWindow : Window
{
    public Point TestPoint
    {
        get { return (Point)GetValue(TestPointProperty); }
        set { SetValue(TestPointProperty, value); }
    }
    public static readonly DependencyProperty TestPointProperty = DependencyProperty.Register("TestPoint", typeof(Point), typeof(MainWindow), new PropertyMetadata(new Point(1.0, 1.0))); …