绑定到 UserControl XAML 内的依赖项属性

Question

我想重用一个控件，但其中一种情况需要上下文菜单，而其他情况则不需要。这是我的尝试。

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();
        }
    }

并在XAML中使用属性：

<ctls:RP8Grid UseContextMenu="False"/>

现在我无法解决的问题是，如何访问 UserControl 中的 UseContextMenu？ 我试过以下方法：

<DataGrid>
  <DataGrid.ContextMenu>
    <ContextMenu IsEnabled="{Binding UseContextMenu,RelativeSource={RelativeSource AncestorType=UserControl, Mode=FindAncestor}}">
  </DataGrid.ContextMenu>
</DataGrid>

结果：

Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.UserControl', AncestorLevel='1'

Answer 1

如果您只是偶尔摆脱 ContextMenu，这会起作用：

<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>

绑定到 UserControl XAML 内的依赖项属性

Binding to a Dependency Property inside UserControl XAML

c#

wpf

xaml

user-controls

dependency-properties

绑定到 UserControl XAML 内的依赖项 属性

Binding to a Dependency Property inside UserControl XAML

c#

wpf

xaml

user-controls

dependency-properties

绑定到 UserControl XAML 内的依赖项属性