WPF编程，通过DoubleAnimation控制图片的透明度，将重叠的图片依次显示。

原文:WPF编程，通过DoubleAnimation控制图片的透明度，将重叠的图片依次显示。

版权声明：我不生产代码，我只是代码的搬运工。 https://blog.****.net/qq_43307934/article/details/87369585

3张图片按照1-3的顺序叠放在面板上，然后依次将图片的透明度由1变化到0。当第1张图片的透明度变为0时显示第2张图片，这样形成了一幅连续的动画。

 

 1、建立窗口在Grid 面板中放置图片

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="auto"/>
        </Grid.RowDefinitions>
        <Grid Name="grid">

        </Grid>
        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition />
                <ColumnDefinition />
                <ColumnDefinition />
                <ColumnDefinition />
            </Grid.ColumnDefinitions>
            <Button Grid.Column="0"
                    Margin="5"
                    Content="开始"
                    Click="Buttonstart" />
            <Button Grid.Column="1"
                    Margin="5"
                    Content="暂停"
                    Click="ButtonPause" />
            <Button Grid.Column="2"
                    Margin="5"
                    Content="继续"
                    Click="ButtonResume"/>
                <Button Grid.Column="3"
                        Margin="5"
                        Content="停止"
                        Click="ButtonStop" />
        </Grid>

    </Grid>

2、后台

public partial class Window3 : Window
    {
        Storyboard story;
        private List<Image> imagelist;

        public Window3()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            story = new Storyboard();
            NameScope.SetNameScope(this, new NameScope());
            imagelist = new List<Image>();

            for (int i = 0; i < 3; i++)
            {
                string name = "img" + (3 - i);
                string strUri;
                strUri = string.Format("pack://application:,,,/Photo/{0}.jpg", (3 - i));
                Image img = new Image();
                img.Name = name;
                BitmapImage myBitmapImage = new BitmapImage();
                myBitmapImage.BeginInit();
                myBitmapImage.UriSource = new Uri(strUri);
                myBitmapImage.EndInit();
                img.Source = myBitmapImage;
                this.RegisterName(name, img);
                grid.Children.Add(img);
                Grid.SetRow(img, 0);
                Grid.SetColumn(img, 0);
                imagelist.Add(img);
            }
            imagelist.Reverse();
            for (int i = 0; i < imagelist.Count - 1; i++)
            {
                DoubleAnimation anim = new DoubleAnimation();
                anim.BeginTime = TimeSpan.FromSeconds(0.9 * i);
                anim.From = 1;
                anim.To = 0;
               // anim.AutoReverse = true;
                anim.RepeatBehavior = RepeatBehavior.Forever;
                anim.Duration = TimeSpan.FromSeconds(0.5);
                Storyboard.SetTargetName(anim, imagelist[i].Name);
                Storyboard.SetTargetProperty(anim, new PropertyPath(Image.OpacityProperty));
                story.Children.Add(anim);
            }

        }

        private void Buttonstart(object sender, RoutedEventArgs e)
        {
            story.Begin(this, true);
        }

        private void ButtonPause(object sender, RoutedEventArgs e)
        {
            story.Pause(this);
        }

        private void ButtonResume(object sender, RoutedEventArgs e)
        {
            story.Resume(this);
        }

        private void ButtonStop(object sender, RoutedEventArgs e)
        {
            story.Stop(this);
        }
    }