c# - 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?

Answer 1

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}'}" />