给定一个非常简单的自定义容器控件 CustomDock,带有两个附加属性 IsFooBar1 和 IsFooBar2。如果设置 IsFooBar2 在更改 IsFooBar1 的值时更新了 IsFooBar1 的值,我如何确保 Visual Studio 将为 IsFooBar1 的值更新生成的 xaml。
自定义控件:
public class CustomDock : DockPanel
{
public static readonly DependencyProperty IsFooBarProperty1 = DependencyProperty.RegisterAttached(
"IsFooBar1",
typeof(Boolean),
typeof(CustomDock),
new FrameworkPropertyMetadata(true, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault)
);
public static void SetIsFooBar1(UIElement element, Boolean value)
{
element.SetValue(IsFooBarProperty1, value);
}
public static Boolean GetIsFooBar1(UIElement element)
{
return (Boolean)element.GetValue(IsFooBarProperty1);
}
public static readonly DependencyProperty IsFooBarProperty2 = DependencyProperty.RegisterAttached(
"IsFooBar2",
typeof(Boolean),
typeof(CustomDock),
new PropertyMetadata(false)
);
public static void SetIsFooBar2(UIElement element, Boolean value)
{
element.SetValue(IsFooBarProperty2, value);
element.SetValue(IsFooBarProperty1, value);
}
public static Boolean GetIsFooBar2(UIElement element)
{
return (Boolean)element.GetValue(IsFooBarProperty2);
}
}
及其在 xaml 中的使用:
<Window x:Class="TestAttachedIndirectProperties.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" xmlns:my="clr-namespace:TestAttachedIndirectProperties">
<Grid>
<my:CustomDock Height="100" HorizontalAlignment="Left" Margin="138,123,0,0" x:Name="customDock1" VerticalAlignment="Top" Width="200">
<Button Content="Button" Height="23" Name="button1" Width="75" my:CustomDock.IsFooBar1="True" my:CustomDock.IsFooBar2="True" />
</my:CustomDock>
</Grid>
在 Visual Studio 设计期间,如果 IsFooBar2 更改为 false,则 IsFooBar1 也应该被赋予一个 false 值,但在属性窗格或 xaml 代码中都不是。