Wpf simple carousel diagram

<UserControl x:Class="CustomControl.UserControl.LbtCtrl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
             xmlns:local="clr-namespace:CustomControl.UserControl"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800" x:Name="me" >
    <UserControl.Resources>
        <SolidColorBrush x:Key="myBrush" Color="Gray" Opacity="0.5" />
        <local:IsVisibilityConverter x:Key="visibilityCvt"/>
        <Style TargetType="RadioButton">
            <Setter Property="IsChecked" Value="False"/>
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="Foreground" Value="#555"/>
            <Setter Property="VerticalAlignment" Value="Bottom"/>
            <Setter Property="Margin" Value="10 10 0 30"/>
            <Setter Property="Cursor" Value="Hand"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="RadioButton">
                        <Grid>
                            <Ellipse x:Name="ellispe" Fill="AliceBlue" Width="15" Height="15" 
                                     HorizontalAlignment="Center" VerticalAlignment="Center"
                                     StrokeThickness="1" Stroke="{StaticResource myBrush}" />
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsChecked" Value="true">
                                <Setter Property="Fill"  TargetName="ellispe" Value="#FF1698E2"/>
                            </Trigger>
                            <Trigger Property="IsChecked" Value="False">
                                <Setter Property="Fill"  TargetName="ellispe" Value="AliceBlue"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="imgKey" TargetType="{x:Type Image}">
            <Setter Property="Cursor" Value="Hand"/>
            <Setter Property="Opacity" Value=".7"/>
            <Setter Property="Visibility" Value="{Binding RelativeSource={RelativeSource 
                     Mode=FindAncestor,AncestorType=Grid},Path=IsMouseOver,FallbackValue=Hidden,Converter=
                {StaticResource visibilityCvt}}"/>
        </Style>
    </UserControl.Resources>
    <Grid Width="600" Height="255">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>
        <Image Grid.ColumnSpan="3"  Stretch="UniformToFill" x:Name="displayImg" />
        <Image  Grid.Column="0" VerticalAlignment="Center"   
                Width="41" Height="69" Cursor="Hand" Source="/CustomControl;component/Images/icon-left.png"
                 Margin="5 5 5 5" Style="{StaticResource imgKey}" MouseDown="PreImg_MouseDown"/>
        <Image  Grid.Column="2" VerticalAlignment="Center"    
                Width="41" Height="69" Cursor="Hand" Source="/CustomControl;component/Images/icon-right.png"
                 Margin="5 5 5 5"  Style="{StaticResource imgKey}" MouseDown="NextImg_MouseDown"/>
        <StackPanel x:Name="stack" Grid.Column="1"  Orientation="Horizontal" HorizontalAlignment="Center"/>
    </Grid>
</UserControl>

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Threading;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media.Imaging;

namespace CustomControl.UserControl
{
    /// <summary>
    /// LbtCtrl.xaml 的交互逻辑   轮播图控件
    /// </summary>
    public partial class LbtCtrl : System.Windows.Controls.UserControl
    {
        public LbtCtrl()
        {
            InitializeComponent();
        }

        private List<BitmapImage> currentListImg = null;

        public List<BitmapImage> CurrentListimg
        {
            set
            {
                initLbtCtrl(value);
            }
        }

        private List<RadioButton> currentListRdtBtn = null;

        private Timer timer = null;
        public void initLbtCtrl(List<BitmapImage> imgList)
        {
            if (imgList == null) { return; }
            bool isChecked = true;
            int rdIndex = 0;
            imgList.ForEach((item)=>{
                RadioButton rdBtn = new RadioButton();
                if (isChecked) { rdBtn.IsChecked = true; isChecked = false; }
                rdBtn.Tag = rdIndex;
                rdIndex++;
                rdBtn.Click += RdBtn_Click;
                stack.Children.Add(rdBtn);
                if (currentListImg == null) { currentListImg = new List<BitmapImage>(); }
                if (currentListRdtBtn == null) { currentListRdtBtn = new List<RadioButton>(); }
                currentListImg.Add(item);
                currentListRdtBtn.Add(rdBtn);
            });
           this.displayImg.Source = currentListImg[0];
            if (timer == null)
            {
                timer = new Timer(new TimerCallback((p)=> 
                       {
                           this.Dispatcher.Invoke(new Action(() =>
                           {
                               NextImg_MouseDown(null, null);
                           }));
                      })
                    ,null,3000,3000);
            }
        }

        private void PreImg_MouseDown(object sender, MouseButtonEventArgs e)
        {
            int count = stack.Children.Count;
            bool  IsFirstEnter = true;
            foreach (RadioButton item in stack.Children)
            {
                if (item.IsChecked==true&& IsFirstEnter)
                {
                    IsFirstEnter = false;
                    item.IsChecked = false;
                    int index =(int) item.Tag;
                    if (index==0)
                    {
                        index = count-1;
                    }
                    else
                    {
                        index--;
                    }
                    this.displayImg.Source = currentListImg[index];
                    currentListRdtBtn[index].IsChecked = true;
                }
            }
        }

        private void NextImg_MouseDown(object sender, MouseButtonEventArgs e)
        {
            int count = stack.Children.Count;
            bool IsFirstEnter = true;
            foreach (RadioButton item in stack.Children)
            {
                if (item.IsChecked == true&&IsFirstEnter)
                {
                    IsFirstEnter = false;
                    item.IsChecked = false;
                    int index = (int)item.Tag;
                    if (index == count-1)
                    {
                        index = 0;
                    }
                    else
                    {
                        index++;
                    }
                    this.displayImg.Source = currentListImg[index];
                    currentListRdtBtn[index].IsChecked = true;
                }
            }
        }
        private void RdBtn_Click(object sender, RoutedEventArgs e)
        {
            foreach (RadioButton item in stack.Children)
            {
                item.IsChecked = false;
            }
            RadioButton rdBtn = (RadioButton)sender;
            rdBtn.IsChecked = true;
            this.displayImg.Source = currentListImg[(int)rdBtn.Tag];
           
        }

    }
    /// <summary>
    /// 控件  显示/隐藏转换器
    /// </summary>
    public class IsVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value != null)
            {
                bool isOk = (bool)value;
                if (isOk)
                {
                    return Visibility.Visible;
                }
                else
                {
                    return Visibility.Collapsed;
                }
            }
            return true;
        }
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return null;
        }
    }
 
}

 

 public partial class TestLbtWin : Window
    {
        public TestLbtWin()
        {
            InitializeComponent();
            List<BitmapImage> imgList = new List<BitmapImage>();

            imgList.Add(new BitmapImage(new Uri(@"https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fattach.bbs.miui.com%2Fforum%2F201305%2F30%2F220025pxfkhykvkgkvuktq.jpg&refer=http%3A%2F%2Fattach.bbs.miui.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1613874045&t=192b795c62c4fb872a34b03aee7b50b3", UriKind.Absolute)));
            imgList.Add(new BitmapImage(new Uri(@"https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fattach.bbs.miui.com%2Fforum%2F201304%2F25%2F195133e7a1l7b4f5117y4y.jpg&refer=http%3A%2F%2Fattach.bbs.miui.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1613874045&t=33dc201b111443c2ede5eac0fb52f048", UriKind.Absolute)));
            imgList.Add(new BitmapImage(new Uri(@"https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=1652123795,1945063222&fm=26&gp=0.jpg", UriKind.Absolute)));
            imgList.Add(new BitmapImage(new Uri(@"https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fattachments.gfan.com%2Fforum%2Fattachments2%2F201301%2F29%2F125313339n39z82ydzc32y.jpg&refer=http%3A%2F%2Fattachments.gfan.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1613874045&t=4eb9547b83ae8c0af716a78e22f4268e", UriKind.Absolute)));
            imgList.Add(new BitmapImage(new Uri(@"https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fattach.bbs.miui.com%2Fforum%2F201306%2F21%2F220728m5zcr5ecr7cqq7bw.jpg&refer=http%3A%2F%2Fattach.bbs.miui.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1613874045&t=ae3fd055772ecd3860128e58fc2f1344", UriKind.Absolute)));
            lbtCtrl.CurrentListimg = imgList;
        }
    }