AnimatedImage.xaml

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<UserControl
    x:Class="PhotoSharingApp.Universal.Controls.AnimatedImage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="200"
    d:DesignWidth="200">

    <Grid>
        <Image x:Name="placeHolderImage" Stretch="Fill" Visibility="Visible" />
        <Image x:Name="image" Stretch="UniformToFill" Opacity="0" />
        <Grid.Resources>
            <Storyboard x:Name="imageFadeInStoryboard">
                <DoubleAnimation From="0" To="1" Duration="0:0:1" Storyboard.TargetName="image"
                                 Storyboard.TargetProperty="Opacity">
                    <DoubleAnimation.EasingFunction>
                        <CubicEase EasingMode="EaseOut" />
                    </DoubleAnimation.EasingFunction>
                </DoubleAnimation>
            </Storyboard>
        </Grid.Resources>
    </Grid>
</UserControl>