廢話不說直接上程式碼：

/// <summary>
    /// MainWindow.xaml 的互動邏輯
    /// </summary>
    public partial class MainWindow : Window
    {
        ObservableCollection<BitmapImage> bmList;
        int index = 0;  //記錄索引      

        BackgroundWorker bw = new BackgroundWorker();
        public MainWindow()
        {
            InitializeComponent();
            InitList();
            CompositionTarget.Rendering += new EventHandler(CompositionTarget_Rendering);
            bw.DoWork += new DoWorkEventHandler(bw_DoWork);
            button1.Click += new RoutedEventHandler(button1_Click);
            button2.Click += new RoutedEventHandler(button2_Click);
            button3.Click += new RoutedEventHandler(button3_Click);
        }

        void button2_Click(object sender, RoutedEventArgs e)
        {
            if (index < bmList.Count - 1)
                index++;
            else
                index = 0;
        }

        void button1_Click(object sender, RoutedEventArgs e)
        {
            if (index > 0)
                index--;
            else
                index = bmList.Count - 1;
        }

        bool flag = true;
        void button3_Click(object sender, RoutedEventArgs e)
        {
            if (flag == true)
            {
                bw.RunWorkerAsync();
                flag = false;
                (sender as Button).Content = "End";
            }
            else
            {
                flag = true;
                (sender as Button).Content = "Start";
            }
         }

        void bw_DoWork(object sender, DoWorkEventArgs e)
        {
            while (!e.Cancel)
            {
                button2_Click(sender, new RoutedEventArgs());
                System.Threading.Thread.Sleep(2000); //停2秒  
                e.Cancel = flag;
            }
        }

        List<string> list = new List<string>();
        public void InitList()
        {
            list = System.IO.Directory.GetFiles("../../Image/").ToList();
            bmList = new ObservableCollection<BitmapImage>();

            for (int i = 1; i < list.Count; i++)
            {
                Uri url = new Uri(list[i].Substring(5), UriKind.Relative);
                BitmapImage bmImg = new BitmapImage(url);
                bmList.Add(bmImg);
            }
        }

        void CompositionTarget_Rendering(object sender, EventArgs e)
        {
            this.imgViewer.Source = bmList[index];
            label1.Content = index.ToString();
            this.imgViewer.Width = this.imgViewer.Source.Width;
            this.imgViewer.Height = this.imgViewer.Source.Height;
                  }
    }
 

效果圖如下：

如果單擊start按鈕，程式會自動瀏覽圖片。

如果單擊左右按鈕，可以手動瀏覽。