<Window x:Class="KeyFrameAnimation" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Key-Frame Animation" Height="200" Width="300"> <StackPanel Margin="15"> <TextBlock Name="label" Block.TextAlignment="Center" Foreground="Blue" /> <Rectangle Name="rect" Width="200" Height="100" Stroke="Blue" Margin="10"> <Rectangle.Fill> <LinearGradientBrush StartPoint="0,0" EndPoint="1,0"> <GradientStop Offset="0" /> <GradientStop Offset="1" /> </LinearGradientBrush> </Rectangle.Fill> </Rectangle> <StackPanel.Triggers> <EventTrigger RoutedEvent="StackPanel.Loaded"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <ColorAnimationUsingKeyFrames Storyboard.TargetName="rect" Storyboard.TargetProperty="Fill.GradientStops[0].Color" RepeatBehavior="Forever"> <LinearColorKeyFrame Value="#FF00FF" KeyTime="0:0:0" /> <LinearColorKeyFrame Value="#00805A" KeyTime="0:0:5" /> <LinearColorKeyFrame Value="#FF0000" KeyTime="0:0:10" /> <LinearColorKeyFrame Value="#0000FF" KeyTime="0:0:15" /> <LinearColorKeyFrame Value="#00FFFF" KeyTime="0:0:20" /> <LinearColorKeyFrame Value="#FF00FF" KeyTime="0:0:25" /> </ColorAnimationUsingKeyFrames> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> </StackPanel.Triggers> </StackPanel> </Window>