MultiDataTrigger不遵守所有条件

Question

我创建了一个"On“"Off”开关，但我无法让MultiDataTrigger遵守所有条件。

<UserControl.Resources>
   <Style TargetType="Button" BasedOn="{StaticResource NoDevExpressStyle}">
      <Setter Property="Template">
         <Setter.Value>
            <ControlTemplate>
               <Border Height="30" Width="81" CornerRadius="15" BorderThickness="1" Background="White">
                  <Border.Style>
                     <Style TargetType="Border">
                        <Style.Triggers>

                           <!-- On Not Selected -->
                           <MultiDataTrigger>
                              <MultiDataTrigger.Conditions>
                                 <Condition Binding="{ Binding Path=State}" Value="{x:Static models:ExperimentState.On}" />
                                 <Condition Binding="{Binding SwitchClicked, RelativeSource={RelativeSource AncestorType=UserControl, Mode=FindAncestor}}" Value="False"></Condition>
                              </MultiDataTrigger.Conditions>
                              <Setter Property="BorderBrush" Value="{StaticResource OnInactiveColorBrush}"></Setter>
                           </MultiDataTrigger>

                           <!-- On Selected -->
                           <MultiDataTrigger>
                              <MultiDataTrigger.Conditions>
                                 <Condition Binding="{ Binding Path=State}" Value="{x:Static models:ExperimentState.On}" />
                                 <Condition Binding="{Binding SwitchClicked, RelativeSource={RelativeSource AncestorType=UserControl, Mode=FindAncestor}}" Value="True"></Condition>
                              </MultiDataTrigger.Conditions>

                              <Setter Property="BorderBrush" Value="{StaticResource OnColorBrush}"></Setter>

                           </MultiDataTrigger>

                           <!-- OFF Not Selected -->
                           <MultiDataTrigger>
                              <MultiDataTrigger.Conditions>
                                 <Condition Binding="{ Binding Path=State}" Value="{x:Static models:ExperimentState.Off}" />
                                 <Condition Binding="{Binding Path=SwitchClicked}" Value="False"></Condition>
                              </MultiDataTrigger.Conditions>
                              <Setter Property="BorderBrush" Value="{StaticResource OffInactiveColorBrush}"></Setter>
                           </MultiDataTrigger>

                           <!-- Off and selected -->
                           <MultiDataTrigger>
                              <MultiDataTrigger.Conditions>
                                 <Condition Binding="{ Binding Path=State}" Value="{x:Static models:ExperimentState.Off}" />
                                 <Condition Binding="{Binding Path=SwitchClicked}" Value="True"></Condition>
                              </MultiDataTrigger.Conditions>

                              <Setter Property="BorderBrush" Value="{StaticResource OffColorBrush}"></Setter>
                           </MultiDataTrigger>
                        </Style.Triggers>
                     </Style>
                  </Border.Style>
               </Border>
               <ControlTemplate.Triggers>
                  <Trigger Property="IsMouseOver" Value="True">
                     <Setter Property="Cursor" Value="Hand"></Setter>
                  </Trigger>
               </ControlTemplate.Triggers>
            </ControlTemplate>
         </Setter.Value>
      </Setter>
   </Style>
</UserControl.Resources>

<Button x:Name="Button" Click="ButtonBase_OnClick" />

它似乎尊重"State“属性，该属性是一个只设置一次且永远不会更改的依赖属性。但是，SwitchClicked不会考虑控件内部的属性。

private bool _switchClicked;
public bool SwitchClicked
{
   get => _switchClicked;
   set => _switchClicked = value;
}


private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
{
   if (Button.Command != null)
   {
      if (Button.Command.CanExecute(Button.CommandParameter))
      {
         SwitchClicked = !SwitchClicked;
         SetValue(IsActiveProperty, !IsActive);
         Button.Command.Execute(null);
      }
   }
}

有人能告诉我如何确保我的所有条件都得到满足吗？

我尝试过将可靠的源代码绑定到自身和用户控件，但是SwitchClicked属性在代码背后，并且没有ViewModel。

Answer 1

你必须在你的视图模型(或者我猜是你的代码隐藏)中实现INotifyPropertyChanged，否则设置你的属性不会通知更改，触发器中的绑定也不会更新。

public event PropertyChangedEventHandler PropertyChanged;

protected virtual void OnPropertyChanged(string propertyName)
{
   PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

public bool SwitchClicked
{
   get => _switchClicked;
   set
   {
      if (_switchClicked != value)
      {
         _switchClicked = value;
         OnPropertyChanged(nameof(SwitchClicked));
      }
   }
}