Change App language at RunTime on-the-fly

Question

I'm currently developing a metro app in which the user can change current language at runtime and all the custom controls that are loaded must update their text regarding to the new language. Problem is that when I change the language using the following code, the app language changes but it will only update text when I restart my app because the pages and controls that are already rendered are cached.

LocalizationManager.UICulture = new System.Globalization.CultureInfo((string)((ComboBoxItem)e.AddedItems[0]).Tag);
Windows.Globalization.ApplicationLanguages.PrimaryLanguageOverride = ((ComboBoxItem)e.AddedItems[0]).Tag as String;

What should I do to force updating text of all custom controls at runtime without restarting my app?

Answer 1

Use this:

var NewLanguage = (string)((ComboBoxItem)e.AddedItems[0]).Tag;

Windows.Globalization.ApplicationLanguages.PrimaryLanguageOverride = NewLanguage;

Windows.ApplicationModel.Resources.Core.ResourceContext.GetForViewIndependentUse().Reset();
//Windows.ApplicationModel.Resources.Core.ResourceContext.GetForCurrentView().Reset();

Windows.ApplicationModel.Resources.Core.ResourceManager.Current.DefaultContext.Reset();

and then reload your Page, using Navigate method:

if (Frame != null)
    Frame.Navigate(typeof(MyPage));

Answer 2

In order to respond right away, you would need to reset the context of the resource manager.

For Windows 8.1: var resourceContext = Windows.ApplicationModel.Resources.Core.ResourceContext.GetForCurrentView();

resourceContext.Reset();

You will still need to force your page to redraw itself and thus re-request the resources to get the changes to take place. For Windows 8, you can see https://timheuer.com/blog/archive/2013/03/26/howto-refresh-languages-winrt-xaml-windows-store.aspx