windows 10 - C# change app language programmatically UWP realtime

Question

In my application for each language string resources are stored separately and are displayed depending of type of language environment. I want to change the language in the application settings. How do I realize that after the language selection instantly apply it in the user interface?

Answer 1

We can use ApplicationLanguages.PrimaryLanguageOverride to change the language during runtime without restart the app.

For example: I have two languages supported "en" and "fr", localized message will show up in textblock.

1. Add using Windows.Globalization;

2. Change the default language from "en" to "fr" by

   ApplicationLanguages.PrimaryLanguageOverride = "fr";
   

3. Re-navigate to the current page to refresh the UI.

   Frame.Navigate(this.GetType());
   

Note that, you need to compare the PrimaryLanguageOverride with the system culture to set the language for next app launch, because the PrimaryLanguageOverride setting is persisted. And if you have page cache enabled, when you apply a different language on the fly, you need to clear the cache by setting Frame.CacheSize = 0; first then set it back.