使用XAML中的枚举字典和字符串中的值进行本地化

Question

I´m trying to databind the current culture with the right enum set in a Dictionary in Xamarin Forms XAML.

I get a list of Events from the server that contain the Dictionary properties containing the languages that I´m going to use to show the right language depending on what Culture is set.

public class Event 
{
  // Having problem binding with the right CultureInfo í the Dictionary
  public Dictionary<Language, string> Title { get; set; }
}

// Types of languages that I could use to pick the right language string
public enum Language
{
    English = 0,
    German
}

// Just a basic view-model
public class EventsViewModel 
{
   public EventsViewModel()
   {
   }

    //James Montemagno´s MVVM Helper https://github.com/jamesmontemagno/mvvm-helpers
    public ObservableRangeCollection<Event> Events { get; } = new ObservableRangeCollection<Event>();
}

// Just a basic Content page public partial class EventsPage : ContentPage { public EventsPage () { InitializeComponent(); BindingContext = new EventsViewModel(Navigation); } }

Now I just need the XAML to bind the right value in the Dictionary based on the enum/culture ...

I have tried doing this "semi-manual" by using a Converter and checking the CultureInfo and picking the right value but for some reason I just can´t get the Converters to fire up.

I also tried to mix up IValueConverter and IMarkupExtension but no good.

Answer 1

Ok I found out what was missing from the Converter method I had been trying to use. I was missing the ConvertParameter and that was the reason the Convert method did´t fire.

So what I did.

1.

I put this line into the App.xaml to be able to access it from anywhere

 <converters:LanguageDictionaryEnumConverter x:Key="LanguageConverter" />

2.

Then I put this one into my page. I do not use the parameter at all. (B ut I would if I could pass in my settings culture object )

<Label Text="{Binding Title,Converter={StaticResource LanguageConverter},ConverterParameter={x:Static dataObjects:Language.English}}" />

3.

And then I implemented a crude dictionary-language-enum converter/picker that chooses the right language string to send back to the page.

    public class LanguageDictionaryEnumConverter : IMarkupExtension, IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var dic = (Dictionary<Language, string>)value;

        var cultInMySettings= Settings.Current.GetCultureInfoOrDefault;
        switch (cultInMySettings.Name)
        {
            case "de-DE":
                return dic[Language.German];
            case "en-US":
                return dic[Language.English];
            default:
                return dic[Language.English]; 
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    public object ProvideValue(IServiceProvider serviceProvider)
    {
        return this;
    }
}

But if you have some better way to databind the values straight to the XAML in some other way I want to hear about it a nd will choose that answer over this one for sure if its more elegant.