绑定到UserControl中的依赖项属性XAML
问题描述:
我想重用控件,但其中一个方案需要上下文菜单,而其他方案则不需要。这是我的尝试。绑定到UserControl中的依赖项属性XAML
public partial class RP8Grid : UserControl {
public bool UseContextMenu {
get { return (bool)GetValue(UseContextMenuProperty); }
set { SetValue(UseContextMenuProperty, value); }
}
// Using a DependencyProperty as the backing store for UseContextMenu. This enables animation, styling, binding, etc...
public static readonly DependencyProperty UseContextMenuProperty =
DependencyProperty.Register("UseContextMenu", typeof(bool), typeof(RP8Grid), new PropertyMetadata(false));
public RP8Grid() {
InitializeComponent();
}
}
而在XAML使用属性:
<ctls:RP8Grid UseContextMenu="False"/>
现在我不能离开广场的一部分,我怎么访问UseContextMenu的用户控件里面? 我曾尝试以下:
<DataGrid>
<DataGrid.ContextMenu>
<ContextMenu IsEnabled="{Binding UseContextMenu,RelativeSource={RelativeSource AncestorType=UserControl, Mode=FindAncestor}}">
</DataGrid.ContextMenu>
</DataGrid>
与结果:
无法为参照 '的RelativeSource FindAncestor,AncestorType =' System.Windows.Controls.UserControl结合找到源”, AncestorLevel ='1'
答
A disabled ContextMenu
打开,但其项目被禁用。那么很难让它结束。如果这就是你想要的,我怀疑,binding proxy会让你在那里(见下面的完整版本)。
如果你想要的是刚刚摆脱ContextMenu
的时代,这将工作:
<DataGrid
>
<DataGrid.Style>
<Style TargetType="DataGrid" BasedOn="{StaticResource {x:Type DataGrid}}">
<Style.Triggers>
<DataTrigger
Binding="{Binding UseContextMenu, RelativeSource={RelativeSource AncestorType=UserControl}}"
Value="True"
>
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu
>
<MenuItem Header="Test Item" />
<MenuItem Header="Test Item" />
<MenuItem Header="Test Item" />
<MenuItem Header="Test Item" />
</ContextMenu>
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.Style>
</DataGrid>
这里的绑定代理版本:
public class BindingProxy : Freezable
{
#region Overrides of Freezable
protected override Freezable CreateInstanceCore()
{
return new BindingProxy();
}
#endregion
public object Data
{
get { return (object)GetValue(DataProperty); }
set { SetValue(DataProperty, value); }
}
// Using a DependencyProperty as the backing store for Data. This enables animation, styling, binding, etc...
public static readonly DependencyProperty DataProperty =
DependencyProperty.Register("Data", typeof(object), typeof(BindingProxy), new UIPropertyMetadata(null));
}
XAML:
<DataGrid
>
<DataGrid.Resources>
<local:BindingProxy
x:Key="UserControlBindingProxy"
Data="{Binding RelativeSource={RelativeSource AncestorType=UserControl}}"
/>
</DataGrid.Resources>
<DataGrid.ContextMenu>
<ContextMenu
IsEnabled="{Binding Data.UseContextMenu, Source={StaticResource UserControlBindingProxy}}"
>
<MenuItem Header="Test Item" />
<MenuItem Header="Test Item" />
<MenuItem Header="Test Item" />
<MenuItem Header="Test Item" />
</ContextMenu>
</DataGrid.ContextMenu>
</DataGrid>
+0
Yessir,触发魔法!非常感谢你。 – markokstate
你说得对,我觉得我打了普通话propdp的d。我的第一个实现。 RelativeSource,然后通过祖先链? – markokstate
'' –
无法找到,我的尝试更新了这个问题 – markokstate