support for .NET framework 3.5

Still have bugs

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

@@ -0,0 +1,79 @@
+using System.ComponentModel;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using HandyControl.Data;
+using HandyControl.Tools.Extension;
+
+
+namespace HandyControlDemo.UserControl
+{
+    /// <summary>
+    ///     左侧主内容
+    /// </summary>
+    public partial class LeftMainContent
+    {
+        public LeftMainContent()
+        {
+            InitializeComponent();
+        }
+
+        private void TabControl_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            if (e.AddedItems.Count == 0) return;
+            if (e.AddedItems[0] is TabItem tabItem && tabItem.Content is ListBox listBox)
+            {
+                if (listBox.SelectedItem != null)
+                {
+                    var item = listBox.SelectedItem;
+                    listBox.SelectedIndex = -1;
+                    listBox.SelectedItem = item;
+                }
+            }
+        }
+
+        private void ButtonStyleAscending_OnClick(object sender, RoutedEventArgs e)
+        {
+            if (ButtonStyleAscending.IsChecked == true)
+            {
+                listStyle.Items.SortDescriptions.Add(new SortDescription("Content", ListSortDirection.Ascending));
+            }
+            else
+            {
+                listStyle.Items.SortDescriptions.Clear();
+            }
+        }
+
+        private void ButtonControlAscending_OnClick(object sender, RoutedEventArgs e)
+        {
+            if (ButtonControlAscending.IsChecked == true)
+            {
+                listControl.Items.SortDescriptions.Add(new SortDescription("Content", ListSortDirection.Ascending));
+            }
+            else
+            {
+                listControl.Items.SortDescriptions.Clear();
+            }
+        }
+
+        private void SearchBarStyle_OnSearchStarted(object sender, FunctionEventArgs<string> e)
+        {
+            if (e.Info == null) return;
+
+            foreach (var listBoxItem in listStyle.Items.OfType<ListBoxItem>())
+            {
+                listBoxItem.Show(listBoxItem.Content.ToString().ToLower().Contains(e.Info.ToLower()));
+            }
+        }
+
+        private void SearchBarControl_OnSearchStarted(object sender, FunctionEventArgs<string> e)
+        {
+            if (e.Info == null) return;
+
+            foreach (var listBoxItem in listControl.Items.OfType<ListBoxItem>())
+            {
+                listBoxItem.Show(listBoxItem.Content.ToString().ToLower().Contains(e.Info.ToLower()));
+            }
+        }
+    }
+}