C# 如何使用布尔值作为触发器
我需要一个VisualStateTrigger,如果ListView.SelectedIndex>-1 我的XAML如下所示:C# 如何使用布尔值作为触发器,c#,visual-studio,xaml,triggers,win-universal-app,C#,Visual Studio,Xaml,Triggers,Win Universal App,我需要一个VisualStateTrigger,如果ListView.SelectedIndex>-1 我的XAML如下所示: <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" EntranceNavigationTransitionInfo.IsTargetElement="True"> <VisualStateManager.VisualStateGroups&g
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
EntranceNavigationTransitionInfo.IsTargetElement="True">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup>
<VisualState x:Name="wideView">
<VisualState.StateTriggers>
<AdaptiveTrigger MinWindowWidth="960"/>
</VisualState.StateTriggers>
<VisualState.Setters>
<Setter Target="ListColumn.Width" Value="420"/>
<Setter Target="DetailColumn.Width" Value="*"/>
</VisualState.Setters>
</VisualState>
<VisualState x:Name="narrowDetailView">
<VisualState.StateTriggers>
<AdaptiveTrigger MinWindowWidth="0"/>
</VisualState.StateTriggers>
<VisualState.Setters>
<Setter Target="ListColumn.Width" Value="0"/>
<Setter Target="DetailColumn.Width" Value="*"/>
</VisualState.Setters>
</VisualState>
<VisualState x:Name="narrowListView">
<VisualState.StateTriggers>
<AdaptiveTrigger MinWindowWidth="0"/>
</VisualState.StateTriggers>
<VisualState.Setters>
<Setter Target="ListColumn.Width" Value="*"/>
<Setter Target="DetailColumn.Width" Value="0"/>
</VisualState.Setters>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="ListColumn" Width="0"/>
<ColumnDefinition x:Name="DetailColumn" Width="*"/>
</Grid.ColumnDefinitions>
<ListView x:Name="SelectionList"
Grid.Column="0"/>
<ListView x:Name="DetailsList"
Grid.Column="1"/>
</Grid>
当SelectionList SelectedIndex==-1时,应选择窄列表视图触发器,否则,窄细节视图触发器是所需的触发器
这是否只有在XAML中才可能(如果可能,最有效的方法是什么),或者我需要在代码隐藏中解决这个问题。库是您的朋友
<VisualState>
<VisualState.StateTriggers>
<triggers:CompareStateTrigger Value="{x:Bind someListView.SelectedIndex, Mode=OneWay}" CompareTo="-1" Comparison="GreaterThan" />
</VisualState.StateTriggers>
<VisualState.Setters>
正确,如果可能的话,我想在xaml中执行此操作。哇!我还没看过那个图书馆。这是一些方便的东西就在那里+1!我试图避免使用一个对我来说有点过分的库,但它很棒,而且很有效。非常感谢。