How to scroll to the bottom of a ScrollViewer automatically with Xaml and binding?

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You can either create an attached property or a behavior to achieve what you want without using code behind. Either way you will still need to write some code.

Here is an example of using attached property.

Attached Property

public static class Helper
{
    public static bool GetAutoScroll(DependencyObject obj)
    {
        return (bool)obj.GetValue(AutoScrollProperty);
    }

    public static void SetAutoScroll(DependencyObject obj, bool value)
    {
        obj.SetValue(AutoScrollProperty, value);
    }

    public static readonly DependencyProperty AutoScrollProperty =
        DependencyProperty.RegisterAttached("AutoScroll", typeof(bool), typeof(Helper), new PropertyMetadata(false, AutoScrollPropertyChanged));

    private static void AutoScrollPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var scrollViewer = d as ScrollViewer;

        if (scrollViewer != null && (bool)e.NewValue)
        {
            scrollViewer.ScrollToBottom();
        }
    }
}

Xaml Binding

<ScrollViewer local:Helper.AutoScroll="{Binding IsLogsChangedPropertyInViewModel}" .../>

You will need to create a boolean property IsLogsChangedPropertyInViewModel and set it to true when the string property is changed.

Hope this helps! 🙂

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