重写控件

自定义ListBox类
C# code

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 public class myListBox : System.Windows.Controls.ListBox
    {
        protected override DependencyObject GetContainerForItemOverride()
        {
            return new myListBoxItem();
        }

    }
    public class myListBoxItem : System.Windows.Controls.ListBoxItem
    {
        protected override void OnSelected(System.Windows.RoutedEventArgs e)
        {
            DependencyObject dep = (DependencyObject)e.OriginalSource;

            while ((dep != null) && !(dep is ListBoxItem))
            {
                dep = VisualTreeHelper.GetParent(dep);
            }

            if (dep == null)
                return;

            ListBoxItem item = (ListBoxItem)dep;

            if (item.IsSelected)
            {
                item.IsSelected = !item.IsSelected;
                //e.Handled = true;
            }
            base.OnSelected(e);
        }
    }

页面引用
C# code
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  xmlns:control="clr-namespace:wpf.DependencyControl"

// 在Grid 中写
  <control:myListBox x:Name="myListBox" Width="100" Height="100" SelectionMode="Single"
                               SelectionChanged="myListBox_SelectionChanged">

// 后台cs代码
C# code
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 private void myListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            object o = myListBox.SelectedItem;
            if (o == null)
                return;
            MessageBox.Show(o.ToString());
        }