如何將多個元素屬性綁定到wpf中的元素？

Question

<Grid x:Name="LayoutRoot"> 
    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center"> 
     <Button Content="Button" Width="112" Height="50" Visibility="{Binding IsFocused, ElementName=textBox1,Converter={StaticResource MyConverter1}}"/>   
    </StackPanel> 
    <TextBox Height="57" HorizontalAlignment="Left" Margin="144,103,0,0" Name="textBox1" VerticalAlignment="Top" Width="98" /> 
    <TextBox Height="57" HorizontalAlignment="Left" Margin="277,103,0,0" x:Name="textBox2" VerticalAlignment="Top" Width="88" /> 
    <TextBox Height="57" HorizontalAlignment="Left" Margin="390,103,0,0" x:Name="textBox3" VerticalAlignment="Top" Width="87" />   
</Grid> 

以上代碼我可以得到以下結果。

如果點擊textBox1的按鈕將隱藏在同一我點擊TextBox2中和textBox3，該按鈕會隱藏。

我需要的是，每當我點擊textBox1的和texBox3，按鈕應該是隱藏。 我的意思是以上線，

<Button Content="Button" Width="112" Height="50" Visibility="{Binding IsFocused, ElementName=textBox1 or textBox3,Converter={StaticResource MyConverter1}}"/> 

這可能嗎？

Answer 1

一種方法是使用MultiBinding和IMultiValueConverter實現。

轉換器的重要部分將是這個樣子：

public class MultiConverter : IMultiValueConverter 
{ 
    public object Convert(object[] values, Type targetType, object parameter, 
          CultureInfo culture) 
    { 
     return values.Cast<bool>().Any(x => x) ? 
       Visibility.Collapsed : Visibility.Visible; 
    } 

    public object[] ConvertBack(object value, Type[] targetTypes, 
           object parameter, CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 
} 

用法是這樣的：

<Button Content="Button" Width="112" Height="50" 
     Margin="196,186,195,75"> 
    <Button.Visibility> 
    <MultiBinding Converter="{StaticResource MultiConverter}"> 
     <Binding ElementName="textBox1" Path="IsFocused" /> 
     <Binding ElementName="textBox3" Path="IsFocused" /> 
    </MultiBinding> 
    </Button.Visibility> 
</Button>