Question

I am new to WPF. I have this code

<Window x:Class="ElementBinding.MultipleBindings"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MultipleBindings" Height="320" Width="300">
    <Grid>
        <Slider Name="sliderFontSize" Margin="0,12,6,243"
                Minimum="1" Maximum="40" Value="10"
                TickFrequency="1" TickPlacement="TopLeft">
        </Slider>
        <TextBox Name="txtContent" Margin="0,44,0,208">Color should change here</TextBox>
        <TextBlock Margin="3,150,3,3" Name="lblSampleText"
                    FontSize="{Binding ElementName=sliderFontSize, Path=Value}"
                    Text="{Binding ElementName=txtContent, Path=Text,Mode=TwoWay}"
                    Foreground="{Binding ElementName=lstColors, Path=SelectedItem.Tag}" >
        Multiple Bindings
        </TextBlock>
        <ListBox Height="54" HorizontalAlignment="Left" Margin="12,90,0,0" Name="lstColors" VerticalAlignment="Top" Width="120" >
            <ListBoxItem>Green</ListBoxItem>
            <ListBoxItem>Red</ListBoxItem>
            <ListBoxItem>Blue</ListBoxItem>
        </ListBox>
    </Grid>
</Window>

Text block will not appear if I select an item in list box. I think problem is in ‘SelectedItem.Tag’. How can I resolve this?

Answer 1

You are correct. It should be Path=SelectedItem.Content:

<TextBlock Margin="3,150,3,3" Name="lblSampleText"
                FontSize="{Binding ElementName=sliderFontSize, Path=Value}"
                Text="{Binding ElementName=txtContent, Path=Text,Mode=TwoWay}"
                Foreground="{Binding ElementName=lstColors, Path=SelectedItem.Content}" >