WPF形式不透明

Question

我在wpf中播放不透明度动画时遇到问题。我有来自按钮，显示另一种形式，不透明度为0到1的双重动画。但是当我按下它时，我看到第二种形式，opacity = 1几毫秒，之后不透明度开始从0变为1.我怎么能在动画开始之前跳过具有opacity = 1的第二个表单的外观？

这是我的主要形式：

public partial class MainWindow : Window
{

    Window1 _wind;

    public MainWindow()
    {
        InitializeComponent();
        _wind = new Window1();

    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        _wind.showForm();
    }
}

这是动画的第二种形式：

    public Window1()
    {
        InitializeComponent();
        this.Opacity = 0;
        this.image1.Opacity = 0;

    }



    public void showForm()
    {
        this.Opacity = 0;
        this.image1.Opacity = 0;

        DoubleAnimation dblAnim = new DoubleAnimation();
        dblAnim.From = 0.0;
        dblAnim.To = 1.0;
        dblAnim.Duration = new Duration(TimeSpan.FromMilliseconds(1500));
        ScaleTransform trans = new ScaleTransform();

        this.image1.RenderTransform = trans;
        this.image1.BeginAnimation(Image.OpacityProperty, dblAnim);

        this.RenderTransform = trans;
        this.BeginAnimation(Image.OpacityProperty, dblAnim);

        this.ShowDialog();

    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        this.Opacity = 0;
        this.image1.Opacity = 0;
        this.Visibility = Visibility.Hidden;           

    }