WindowsFormsTest/SwitchLanguageTest/LanguageManager.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace SwitchLanguageTest
{
    public static class LanguageManager
    {
        public static void ChangeLanguage(string languageCode)
        {
            var resourceDict = new ResourceDictionary();

            switch (languageCode)
            {
                case "zh-CN":
                    resourceDict.Source = new Uri("/Strings.zh-CN.xaml", UriKind.Relative);
                    break;
                case "en":
                    resourceDict.Source = new Uri("/Strings.en.xaml", UriKind.Relative);
                    break;
            }

            Application.Current.Resources.MergedDictionaries.Clear();
            Application.Current.Resources.MergedDictionaries.Add(resourceDict);
        }
    }
}