我有一个MyUserControl类,它扩展了UserControl,参数如下:
namespace MyNameSpace
{
public partial class MyUserControl: UserControl
{
public MyUserControl()
{
InitializeComponent();
}
private Control _owner;
public Control Owner
{
set { _owner = value; }
get { return _owner; }
}
}
}
例如,如何将 XAML 中的网格作为该参数传递?
<Window x:Class="MyNameSpace.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:MyNameSpace">
<Grid x:Name="grid1">
<my:MyUserControl x:Name="myUserControl1" Parent="*grid1?*" />
</Grid>
</Window>
您需要将 Owner 属性实现为 DependencyProperty。 这是用户控件所需的代码:
public static readonly DependencyProperty OwnerProperty =
DependencyProperty.Register("Owner", typeof(Control), typeof(MyUserControl),
new FrameworkPropertyMetadata(null, OnOwnerPropertyChanged)
);
private static void OnOwnerPropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs e)
{
((MyUserControl)source).Owner = (Control)e.NewValue;
}
public Control Owner
{
set { SetValue(OwnerProperty, value); }
get { return (Control)GetValue(OwnerProperty); }
}
然后在 XAML 中,您将能够按预期设置属性:
<Button x:Name="Button1" Content="A button" />
<my:MyUserControl Owner="{Binding ElementName=Button1}" x:Name="myUserControl1" />
(请注意,您的示例不起作用,因为 grid1 继承自 FrameworkElement 类型,而不是 Control。 您需要将 Owner 属性更改为 FrameworkElement 类型,以便能够将其设置为 grid1。
有关依赖项属性的详细信息,请参阅此优秀教程:http://www.wpftutorial.net/dependencyproperties.html
U 应该使用 DependancyProperty 进行绑定,如前所述,你也可以使用 RelativeSource
Parent={Binding RelativeSource={RelativeSource AncestorType=Grid}}