How to find that ScrollViewer is scrolled to the end in WPF?

You can check this with this way:

...scrollViewer.ScrollChanged += OnScrollChanged;...private void OnScrollChanged(object sender, ScrollChangedEventArgs e){   var scrollViewer = (ScrollViewer)sender;   if (scrollViewer.VerticalOffset == scrollViewer.ScrollableHeight)          MessageBox.Show("This is the end"); }

Here is my MVVM-friendly version:

public static class ScrollHelper{    public static readonly DependencyProperty ScrollToBottomProperty = DependencyProperty.RegisterAttached("ScrollToBottom", typeof(ICommand), typeof(ScrollHelper), new FrameworkPropertyMetadata(null, OnScrollToBottomPropertyChanged));    public static ICommand GetScrollToBottom(DependencyObject ob)    {        return (ICommand) ob.GetValue(ScrollToBottomProperty);    }    public static void SetScrollToBottom(DependencyObject ob, ICommand value)    {        ob.SetValue(ScrollToBottomProperty, value);    }    private static void OnScrollToBottomPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)    {        var scrollViewer = obj as ScrollViewer;        scrollViewer.Loaded += OnScrollViewerLoaded;    }    private static void OnScrollViewerLoaded(object sender, RoutedEventArgs e)    {        (sender as ScrollViewer).Loaded -= OnScrollViewerLoaded;        (sender as ScrollViewer).Unloaded += OnScrollViewerUnloaded;        (sender as ScrollViewer).ScrollChanged += OnScrollViewerScrollChanged;    }    private static void OnScrollViewerScrollChanged(object sender, ScrollChangedEventArgs e)    {                   var scrollViewer = (ScrollViewer)sender;        if (scrollViewer.VerticalOffset >= scrollViewer.ScrollableHeight)        {            var command = GetScrollToBottom(sender as ScrollViewer);            if (command == null || !command.CanExecute(null))                return;            command.Execute(null);        }    }    private static void OnScrollViewerUnloaded(object sender, RoutedEventArgs e)    {        (sender as ScrollViewer).Unloaded -= OnScrollViewerUnloaded;        (sender as ScrollViewer).ScrollChanged -= OnScrollViewerScrollChanged;    }}