Question

我有一个WPF树视图，节点可见性取决于他们的＆＃34;删除＆＃34;绑定属性：

    <Style x:Name="SelectedTreeItem" TargetType="TreeViewItem">
    <EventSetter Event="MouseRightButtonDown" Handler="TreeSetup_MouseRightButtonDown"/>
          <Setter Property="IsSelected" Value="{Binding Path=IsSelected, Mode=TwoWay}" />
          <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}"/>
          <Setter Property="Visibility" Value="Visible" />
          <Style.Triggers>
            <DataTrigger Binding="{Binding Deleted}" Value="True">
               <Setter Property="Visibility" Value="Collapsed" />
            </DataTrigger>
          </Style.Triggers>
   </Style>

我想添加一些方法来忽略这个已删除的属性值。这可以通过按钮＆＃34;显示已删除的项目＆＃34;来实现。我不想改变＆＃34;删除＆＃34;值，而是添加一个全局条件，强制此绑定忽略，直到再次按下该按钮。

Answer 1

您可以通过MultiDataTrigger.Conditions来实现。以下是可见性的示例：

<Style>
            <Setter Property="Control.Visibility" Value="Visible" />
            <Style.Triggers>
                <MultiDataTrigger>
                    <MultiDataTrigger.Conditions>
                        <Condition Binding="{Binding Path=IsPropA}" Value="false" />
                        <Condition Binding="{Binding Path=IsPropB}" Value="false" />
                    </MultiDataTrigger.Conditions>
                    <Setter Property="Control.Visibility" Value="Hidden" />
                </MultiDataTrigger>
            </Style.Triggers>
        </Style>

Answer 2

我将另一个答案与静态资源结合使用

<Style>
        <Setter Property="Control.Visibility" Value="Visible" />
        <Style.Triggers>
            <MultiDataTrigger>
                <MultiDataTrigger.Conditions>
                    <Condition Binding="{Binding Path=IsPropA}" Value="false" />
                    <Condition Binding="{Binding Source={StaticResource ClassName},Path=PropertyName}" Value="False"/>                                    
                </MultiDataTrigger.Conditions>
                <Setter Property="Control.Visibility" Value="Hidden" />
            </MultiDataTrigger>
        </Style.Triggers>
    </Style>

只需在Window资源下创建本地资源：

    <Window.Resources>
    <local:ClassName x:Key="ClassName"/>

然后用于显示删除的按钮：

     private void btnApply_Click(object sender, RoutedEventArgs e)
    {
        //ApplyGeneralChanges();
        var item = this.FindResource("ClassName") as ClassName;
        item.DisplayDeleted = !item.DisplayDeleted;
    }

WPF树视图项可见性绑定到属性+静态变量

2 个答案: