Windows Phone 8.1 XAML StringFormat

Question

I am trying to display some text along with binded data, for example, I have the code:

<TextBlock Text="{Binding Shorthand}"  Style="{ThemeResource ListViewItemTextBlockStyle}" />

I want to add some text before 'Shorthand', from what I have read this would be possible by using StringFormat as a property of the Binding, something along the lines of:

<TextBlock Text="{Binding Path=Shorthand, StringFormat={0} text I want to add}"  Style="{ThemeResource ListViewItemTextBlockStyle}" />

However this doesn't seem to work, is this no longer the way to do things in 8.1?

aren't you missing the ' in StringFormat='{0} text I want to add' ? — Karthik Ganesan, Jun 09 '14 at 19:22
Error I was getting was: "The property 'StringFormat' was not found in type 'Binding'" — blawford, Jun 09 '14 at 19:30

score 30 · Accepted Answer · answered Jun 09 '14 at 19:26

StringFormat isn't supported on WinRT. However, you can easily replace it by creating a custom converter:

public class StringFormatConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        return string.Format(parameter as string, value);
    }  

    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        return null;
    }
}

Then declare it in your page resources:

<Page.Resources>
    <local:StringFormatConverter x:Name="StringFormat"/>
</Page.Resources>

And use it in your bindings:

<TextBlock Text="{Binding Path=SomeText, Converter={StaticResource ResourceKey=StringFormat}, ConverterParameter='Hello {0}'}" />

score 16 · Answer 2 · answered Jun 09 '14 at 19:47

Like @KooKiz pointed out StringFormat at the moment isn't supported, but you could accomplish the same effect just breaking out your lines into inline Runs without a converter like;

<TextBlock>
   <Run Text="Hey I wanted to put this text in front of "/>
   <Run Text="{Binding Path=Shorthand}"/>
   <Run Text=" and I also wanted some text after it. Neato.."/>
</TextBlock>

Hope this helps, cheers.

score 0 · Answer 3 · answered Oct 12 '15 at 18:53

0

I used this approach (Written by Microsoft): https://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.data.ivalueconverter

It works great!

answered Oct 12 '15 at 18:53

deanpodgornik

322
2
7

Windows Phone 8.1 XAML StringFormat

3 Answers3

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