Demo adds language switching

HandyControlDemo/UserControl/Main/NoUserContent.xaml.cs

@@ -1,14 +1,43 @@
-// ReSharper disable once CheckNamespace
+using System;
+using System.Diagnostics;
+using System.Reflection;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using HandyControl.Controls;
+using HandyControlDemo.Data;
+
+// ReSharper disable once CheckNamespace
 namespace HandyControlDemo.UserControl
 {
-    /// <summary>
-    /// NoUserContent.xaml 的交互逻辑
-    /// </summary>
     public partial class NoUserContent
     {
         public NoUserContent()
         {
             InitializeComponent();
+
+            ImageLang.Source = BitmapFrame.Create(new Uri($"pack://application:,,,/HandyControlDemo;component/Resources/Img/Flag/{GlobalData.Config.Lang}.png"));
+        }
+
+        private void ButtonLang_OnClick(object sender, RoutedEventArgs e) => PopupLang.IsOpen = true;
+
+        private void ButtonLangs_OnClick(object sender, RoutedEventArgs e)
+        {
+            if (e.OriginalSource is Button button && button.Tag is string tag)
+            {
+                PopupLang.IsOpen = false;
+                if (tag.Equals(GlobalData.Config.Lang)) return;
+                Growl.Ask(Properties.Langs.Lang.ChangeLangAsk, b =>
+                {
+                    if (!b) return true;
+                    GlobalData.Config.Lang = tag;
+                    GlobalData.Save();
+                    Process.Start(Assembly.GetExecutingAssembly().Location);
+                    Environment.Exit(0);
+                    return true;
+                });
+            }
         }
     }
 }