var resourceHelper = new ResourceHelper();

// OR

var resourceHelper = new ResourceHelper(new ResourceManager());

GetAllResourcesKeys

var getAllResources = resourceHelper.GetAllResourcesKeys();

SetLanguage

resourceHelper.SetLanguage("fa");

GetString

var value = resourceHelper.GetString("Test");

MVVM Pattern

services.AddSingleton<IResourceHelper, ResourceHelper>();


public MainViewModel(IResourceHelper resourceHelper)
{
    resourceHelper.GetString("Test");
}