Xamarin Forms Cross Platform App Resource File with StringFormat

Question

Is there a way to apply a StringFormat to a value from a Resource file. I basically want something like this:

Text="{localapp:Translate Port, StringFormat='{0}:'}"

Basically I don't want to put punctuation in the Resource file so I can reuse the value in more places in my app. Any help would be appreciated.

Answer 1

First we need to add a further property in our translate MarkupExtension to support StringFormat:

[ContentProperty("Text")]
public class TranslateExtension : IMarkupExtension
{
    public string Text { get; set; }

    public string StringFormat { get; set; }

    public object ProvideValue(IServiceProvider serviceProvider)
    {
        if (string.IsNullOrEmpty(Text))
            return null;

        if (!string.IsNullOrEmpty(StringFormat))
            return string.Format(StringFormat, Resources.ResourceManager.GetString(Text));

        return Resources.ResourceManager.GetString(Text);
    }
}

Now we can use StringFormat in XAML like this:

<Label Text="{utilities:Translate Port, StringFormat='{0}:'}"/>

Now assuming we already defined a resourse such as Port="MyPort" , the output of the label would be:

MyPort: