String format using MultiBinding?

Question

I'm trying to display a string in XAML using Label control. Following is my XAML code :

<Label Height="28" HorizontalAlignment="Left" Margin="233,68,0,0" Name="label13" VerticalAlignment="Top">
    <Label.Content>
        <MultiBinding StringFormat="{}{0} x {1}">
              <Binding Path="Width" />
              <Binding Path="Height" />
        </MultiBinding>
    </Label.Content>

Width and Height are two properties of my class Movie. I want the label to display : "Width x Height" ex. 800 x 640 However the label control remains empty. Any help is appreciated. I WANT TO DO THIS WITHOUT USING A CONVERTER.

I have modified my xaml by using a TextBlock instead of Label. But still it wont populate display the output.

<TextBlock Height="28" HorizontalAlignment="Left" Margin="233,68,0,0" Name="label13" VerticalAlignment="Top">
                <TextBlock.Text>
                    <MultiBinding StringFormat="{}{0} x {1}">
                        <Binding Path="Width" />
                        <Binding Path="Height" />
                    </MultiBinding>
                </TextBlock.Text>
            </TextBlock>

Did you look at this? http://stackoverflow.com/questions/4010772/binding-stringformat — Paul Matovich, Dec 04 '11 at 19:05
have you implement the INotificationChanged interface for your class movie? is your Binding correct? (look at the vs output window) — punker76, Dec 06 '11 at 06:00

punker76 · Accepted Answer · 2011-12-06T05:58:07.247

you are trying to bind a string to an object. But StringFormat requires its target to be a string type.

try putting a TextBlock in your label content and bind your data to it

<StackPanel>
  <Slider x:Name="sl1" Minimum="10" Maximum="100"/>
  <Slider x:Name="sl2" Minimum="10" Maximum="100"/>
  <Label x:Name="label13" Background="Yellow" Foreground="Black">
    <Label.Content>
        <TextBlock>
          <TextBlock.Text>
            <MultiBinding StringFormat="{}{0} x {1} Test">
              <Binding ElementName="sl1" Path="Value" />
              <Binding ElementName="sl2" Path="Value" />
            </MultiBinding>
          </TextBlock.Text>
        </TextBlock>
    </Label.Content>
  </Label>
</StackPanel>

EDIT your class Movie must implement the INotificationPropertyChanged interface and your two properties must raise the property changed event with their proprty names!

hope this helps

can you elaborate why it works when `TextBlock` is inside `Label` and doesn't work otherwise? — IgorStack, Mar 21 '18 at 19:42
@IgorStack because the target of the binding is a different type. `TextBlock.Text` is a `string`, but `Label.Content` is an `object`. The `StringFormat` property only kicks in for string-typed targets. — Sorensen, Jun 22 '18 at 00:36

String format using MultiBinding?

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