WPFDatagridListBoxScrollViewer上下滚动（动画）
采⽤属性动画的⽅式。由于动画绑定时需要绑定依赖属性，但ScrollViewer没有⽔平偏移和垂直偏移的依赖属性，所以需要通过附加属性的⽅式添加⽔平和垂直的依赖属性
public static class ScrollViewerBehavior
{
public static readonly DependencyProperty HorizontalOffsetProperty = DependencyProperty.RegisterAttached("HorizontalOffset", typeof(double), typeof(ScrollViewerBehavior), new UIPropertyMetadata(0.0, OnHorizontalOffsetChanged));
public static void SetHorizontalOffset(FrameworkElement target, double value) => target.SetValue(HorizontalOffsetProperty, value);
public static double GetHorizontalOffset(FrameworkElement target) => (double)target.GetValue(HorizontalOffsetProperty);
private static void OnHorizontalOffsetChanged(DependencyObject target, DependencyPropertyChanged
EventArgs e) => (target as ScrollViewer)?.ScrollToHorizontalOffset((double)e.NewValue);
public static readonly DependencyProperty VerticalOffsetProperty = DependencyProperty.RegisterAttached("VerticalOffset", typeof(double), typeof(ScrollViewerBehavior), new UIPropertyMetadata(0.0, OnVerticalOffsetChanged));
public static void SetVerticalOffset(FrameworkElement target, double value) => target.SetValue(VerticalOffsetProperty, value);
public static double GetVerticalOffset(FrameworkElement target) => (double)target.GetValue(VerticalOffsetProperty);
private static void OnVerticalOffsetChanged(DependencyObject target, DependencyPropertyChangedEventArgs e) => (target as ScrollViewer)?.ScrollToVerticalOffset((double)e.NewValue);
}
xml 代码
<ScrollViewer HorizontalScrollBarVisibility="Disabled" Grid.Column="1" VerticalScrollBarVisibility="Hidden"
HorizontalAlignment="Stretch" x:Name="ScrollViewertest"  Margin="10,0,0,0" >
<!--填充控件-->
</ScrollViewer>
动画绑定，并开始动画
private Void ScrollViewerAnimation(int TotalCount)// TotalCount 共有多少条数据
  {
      　int LineCount=5;//每⾏显⽰5条数据
      Storyboard storyboard = new Storyboard();　
      　TimeSpan ts = new TimeSpan(0, 0, 25);//向下滚动耗时
double end = 200;; //向下滚动距离，可滚动数据源个数调整
DoubleAnimation TopToButtomAnimation = new DoubleAnimation();
TopToButtomAnimation.EasingFunction = new SineEase { EasingMode = EasingMode.EaseInOut };//EasingMode：滚动⽅式
TopToButtomAnimation.From = 0;
TopToButtomAnimation.To = end;
TopToButtomAnimation.Duration = new Duration(ts);
TopToButtomAnimation.AutoReverse = true; //ture：来回滚动,False：只向下滚动
TopToButtomAnimation.SpeedRatio = 1;//滚动速率
storyboard.Duration = new Duration(TimeSpan.FromSeconds(50));//上下滚动总时长
storyboard.Children.Add(TopToButtomAnimation);
        //动画绑定
Storyboard.SetTarget(TopToButtomAnimation, ScrollViewertest);
Storyboard.SetTargetName(TopToButtomAnimation, ScrollViewertest.Name);
Storyboard.SetTargetProperty(TopToButtomAnimation, new PropertyPath(ScrollViewerBehavior.VerticalOffsetProperty));
storyboard.RepeatBehavior = RepeatBehavior.Forever; //循环滚动
storyboard.FillBehavior = FillBehavior.HoldEnd;
storyboard.Begin();
html animation属性
}    　
List和DataGrid滚动都可以采取该⽅式，控制控件的ScrollViewer 进⾏滚动。
private childItem FindVisualChild<childItem>(DependencyObject obj) where childItem : DependencyObject
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(obj, i);
if (child != null && child is childItem)
return (childItem)child;
else
{
childItem childOfChild = FindVisualChild<childItem>(child);
if (childOfChild != null)
return childOfChild;
}
}
return null;
}
<Listbox X:Name="_Listbox"/>
private void ListAnimation(int TotalCount)
{
scrollViewer = FindVisualChild<ScrollViewer>(this._Listbox);
    Storyboard storyboard = new Storyboard();
TimeSpan ts = new TimeSpan(0, 2, 0);
double end = 200;//滚动距离，可根据数据源个数调整
DoubleAnimation TopToButtomAnimation = new DoubleAnimation();
TopToButtomAnimation.EasingFunction = new SineEase { EasingMode = EasingMode.EaseOut };
TopToButtomAnimation.From = 0;
TopToButtomAnimation.To = end;
TopToButtomAnimation.Duration = new Duration(ts);
TopToButtomAnimation.AutoReverse = true;
TopToButtomAnimation.SpeedRatio = 1;
storyboard.Duration = new Duration(TimeSpan.FromMinutes(4));
storyboard.Children.Add(TopToButtomAnimation);
Storyboard.SetTarget(TopToButtomAnimation, scrollViewer);
Storyboard.SetTargetName(TopToButtomAnimation, scrollViewer.Name);
Storyboard.SetTargetProperty(TopToButtomAnimation, new PropertyPath(ScrollViewerBehavior.VerticalOffsetProperty));
storyboard.RepeatBehavior = RepeatBehavior.Forever;
storyboard.Begin();
}

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