WPF - 使用ComboBox进行条件可见性

问题描述：

我是WPF（和.Net中的新手）。我有2个组合框，并且想要控制第一个可见视频：WPF - 使用ComboBox进行条件可见性

如果在左侧组合框中选择了“Uno”，则右侧组合框被隐藏。

这是我的XAML：

<Window x:Class="WpfApp1.MainWindow" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:local="clr-namespace:WpfApp1" 
    mc:Ignorable="d" 
    Title="MainWindow" Height="350" Width="525"> 
<Grid> 
    <ComboBox x:Name="Left" HorizontalAlignment="Left" Margin="66,47,0,0" VerticalAlignment="Top" Width="120"> 
     <ComboBoxItem Content="Uno"></ComboBoxItem> 
     <ComboBoxItem Content="Dos"></ComboBoxItem> 
    </ComboBox> 
    <ComboBox x:Name="Right" HorizontalAlignment="Left" Margin="326,47,0,0" VerticalAlignment="Top" Width="120"> 
     <Style TargetType="ComboBox"> 
      <Style.Triggers> 
       <DataTrigger Binding="{Binding ElementName=Left, Path=SelectedItem}" Value="Uno"> 
        <Setter Property="Visibility" Value="Hidden"></Setter> 
       </DataTrigger> 
      </Style.Triggers> 
     </Style> 
    </ComboBox> 

</Grid>

我也试过

<DataTrigger Binding="{Binding ElementName=Left, Path=SelectedIndex}" Value="0"> 
     <Setter Property="Visibility" Value="Hidden"></Setter> 
</DataTrigger>

感谢您的帮助和时间

答

权ComboBox并绑定Style属性正好被设置为SelectedItem.Content：

<ComboBox x:Name="Right" HorizontalAlignment="Left" Margin="326,47,0,0" VerticalAlignment="Top" Width="120"> 
    <ComboBox.Style> 
     <Style TargetType="ComboBox"> 
      <Style.Triggers> 
       <DataTrigger Binding="{Binding ElementName=Left, Path=SelectedItem.Content}" Value="Uno"> 
        <Setter Property="Visibility" Value="Hidden"></Setter> 
       </DataTrigger> 
      </Style.Triggers> 
     </Style> 
    </ComboBox.Style> 
</ComboBox>

答

<Grid> 
    <Grid.Resources> 
     <local:IntToVisibilityConverter x:Key="IntToVisibilityConverter" /> 
    </Grid.Resources> 

    <ComboBox x:Name="Left" HorizontalAlignment="Left" Margin="66,47,0,0" VerticalAlignment="Top" Width="120"> 
     <ComboBoxItem Content="Uno"></ComboBoxItem> 
     <ComboBoxItem Content="Dos"></ComboBoxItem> 
    </ComboBox> 

    <ComboBox x:Name="Right" HorizontalAlignment="Left" Margin="326,47,0,0" VerticalAlignment="Top" Width="120" Visibility="{Binding ElementName=Left, Path=SelectedIndex,Converter={StaticResource IntToVisibilityConverter}}"> 
    </ComboBox> 
</Grid>

public class IntToVisibilityConverter: IValueConverter 
{ 
    /// <summary> 
    /// Used to Convert a value 
    /// </summary> 
    public object Convert(object value, Type targetType, object parameter, string language) 
    { 
     int index= (int)value; 
     return index==0? Visibility.Hidden : Visibility.Visible; 
    } 

    /// <summary> 
    /// Inverse of Convert method 
    /// </summary> 
    public object ConvertBack(object value, Type targetType, object parameter, string language) 
    { 
     throw new NotImplementedException(); 
    } 
}

WPF - 使用ComboBox进行条件可见性

相关推荐