support for .NET framework 3.5

Still have bugs

Net35/HandyControlDemo_Net35/UserControl/Main/NoUserContent.xaml.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Diagnostics;
+using System.Reflection;
+using System.Windows;
+using System.Windows.Controls;
+using GalaSoft.MvvmLight.Messaging;
+using HandyControl.Controls;
+using HandyControl.Data;
+using HandyControlDemo.Data;
+using HandyControlDemo.Tools;
+using HandyControlDemo.Window;
+
+
+namespace HandyControlDemo.UserControl
+{
+    public partial class NoUserContent
+    {
+        public NoUserContent()
+        {
+            InitializeComponent();
+        }
+
+        private void ButtonLangs_OnClick(object sender, RoutedEventArgs e)
+        {
+            if (e.OriginalSource is Button button && button.Tag is string tag)
+            {
+                PopupConfig.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;
+                });
+            }
+        }
+
+        private void ButtonConfig_OnClick(object sender, RoutedEventArgs e) => PopupConfig.IsOpen = true;
+
+        private void ButtonSkins_OnClick(object sender, RoutedEventArgs e)
+        {
+            if (e.OriginalSource is Button button && button.Tag is SkinType tag)
+            {
+                PopupConfig.IsOpen = false;
+                if (tag.Equals(GlobalData.Config.Skin)) return;
+                GlobalData.Config.Skin = tag;
+                GlobalData.Save();
+                ((App)Application.Current).UpdateSkin(tag);
+            }
+        }
+
+        private void MenuItemLinks_OnClick(object sender, RoutedEventArgs e)
+        {
+            if (e.OriginalSource is MenuItem menuItem && menuItem.Tag is string tag)
+            {
+                Process.Start(tag);
+            }
+        }
+
+        private void MenuItemQQGroup_OnClick(object sender, RoutedEventArgs e)
+        {
+            Messenger.Default.Send<object>(null, MessageToken.ClearLeftSelected);
+            Messenger.Default.Send(true, MessageToken.FullSwitch);
+            Messenger.Default.Send(AssemblyHelper.CreateInternalInstance($"UserControl.{MessageToken.QQGroupView}"), MessageToken.LoadShowContent);
+        }
+
+        private void MenuItemContributors_OnClick(object sender, RoutedEventArgs e)
+        {
+            Messenger.Default.Send<object>(null, MessageToken.ClearLeftSelected);
+            Messenger.Default.Send(true, MessageToken.FullSwitch);
+            Messenger.Default.Send(AssemblyHelper.CreateInternalInstance($"UserControl.{MessageToken.ContributorsView}"), MessageToken.LoadShowContent);
+        }
+
+        private void MenuAbout_OnClick(object sender, RoutedEventArgs e)
+        {
+            new AboutWindow
+            {
+                Owner = Application.Current.MainWindow
+            }.ShowDialog();
+        }
+    }
+}