GetLeft() 在动画将面板移动到窗口旁边后返回 0

我还在学习wpf，所以我在这里有点困惑。该代码在窗口左侧的按钮叮当声上对 StackPanel 进行动画处理，然后在原始位置单击另一个按钮。它可以工作，但是如果您在显示或隐藏时单击两次，它会移动面板，然后执行动画，即使没有必要（代码比我更清晰）。如有必要，我试图拦截面板的实际位置以停止动画，但属性 GetLeft（） 始终返回 0。

该 xaml

        <Canvas>
            <StackPanel x:Name="pannello_laterale" Width="100" Panel.ZIndex="10" Canvas.Left="0" Canvas.Top="0" Canvas.Bottom="0" Background="Azure">
                <Button>
                    <StackPanel>
                        <Label>bim</Label>
                        <Label>bum</Label>
                    </StackPanel>
                </Button>
                <Button>bam</Button>
            </StackPanel>
            <Button x:Name="Mostra" Content="Show" Canvas.Left="201" Canvas.Top="56" Width="75" Click="Mostra_Click"/>
            <Button x:Name="Nascondi" Content="Hide" Canvas.Left="201" Canvas.Top="107" Width="75" Click="Nascondi_Click"/>
        </Canvas>

代码

        using System;
        using System.Collections.Generic;
        using System.Linq;
        using System.Text;
        using System.Threading.Tasks;
        using System.Windows;
        using System.Windows.Controls;
        using System.Windows.Data;
        using System.Windows.Documents;
        using System.Windows.Input;
        using System.Windows.Media;
        using System.Windows.Media.Imaging;
        using System.Windows.Navigation;
        using System.Windows.Shapes;
        using System.Windows.Media.Animation;
    namespace Prova_WPF2
    {
        /// <summary>
        /// Logica di interazione per MainWindow.xaml
        /// </summary>
        public partial class MainWindow : Window
        {
            public MainWindow()
            {
                InitializeComponent();
            }
            private void Mostra_Click(object sender, RoutedEventArgs e)
            {
                posizione.MoveXTo(pannello_laterale, -100.00, 0.00, 0.3);
            }
            private void Nascondi_Click(object sender, RoutedEventArgs e)
            {
                posizione.MoveXTo(pannello_laterale, 0.00, -100.00, 0.3);
            }
        }
        public static class posizione
        {
            public static void MoveXTo(this StackPanel target, double FromX, double ToX, double Time)
            {
                var left = Canvas.GetLeft(target);
                //MessageBox.Show(left.ToString());
                TranslateTransform transformation = new TranslateTransform();
                target.RenderTransform = transformation;
                DoubleAnimation animation = new DoubleAnimation(FromX, ToX, TimeSpan.FromSeconds(Time));
                transformation.BeginAnimation(TranslateTransform.XProperty, animation);
            }
        }
    }