How to stop an animation WPF?

Question

How to stop an animation so it won\'t produce Completed event. Here\'s simple example

Answer 1

you can use this:

<Border Width="20" Height="20" Background="Red" x:Name="border" >
                <Border.Triggers>
                    <EventTrigger RoutedEvent="MouseEnter">
                        <BeginStoryboard Name="Ali">
                            <Storyboard>
                                <DoubleAnimation To="0" Duration="0:0:4" Completed="com" Storyboard.TargetProperty="Opacity"/>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger>
                    <EventTrigger RoutedEvent="MouseLeave">
                        <StopStoryboard  BeginStoryboardName="Ali"/>
                    </EventTrigger>
                </Border.Triggers>
            </Border>

and :

private void com(object sender, EventArgs e)
        {
            MessageBox.Show("boom!");
        }

Answer 2

You could use Property or Data Trigger's EnterActions and ExitActions properties or as @Ali said correctly use Begin and Stop storyboard.