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使用MediaElement来显示gif图片，封装控件代码如下：

Xaml：

<UserControl x:Class="giftest01.GifImage"

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

             xmlns:local="clr-namespace:giftest01"

             mc:Ignorable="d"

             d:DesignHeight="300" d:DesignWidth="300">

    <Border BorderBrush="{Binding RelativeSource={RelativeSource TemplatedParent},Path=BorderBrush}"

            BorderThickness="{Binding RelativeSource={RelativeSource TemplatedParent},Path=BorderThickness}">

        <MediaElement x:Name="gifMedia"  MediaEnded="gifMedia_MediaEnded" UnloadedBehavior="Manual"  LoadedBehavior="Play" />

    </Border>

</UserControl>

cs：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

namespace giftest01

{

    /// <summary>

    /// GifImage.xaml 的交互逻辑

    /// </summary>

    public partial class GifImage : UserControl

    {

        public GifImage()

        {

            InitializeComponent();

        }

        public Uri Source

        {

            get { return (Uri)GetValue(SourceProperty); }

            set { SetValue(SourceProperty, value); }

        }

        // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...

        public static readonly DependencyProperty SourceProperty =

            DependencyProperty.Register("Source", typeof(Uri), typeof(GifImage), new PropertyMetadata(null,(sender,p)=> {

                (sender as GifImage).UpdateSource();

            }));

        private void UpdateSource()

        {

            gifMedia.Source = Source;

            gifMedia.Play();

        }

        private void gifMedia_MediaEnded(object sender, RoutedEventArgs e)

        {

            gifMedia.Position = new TimeSpan(0, 0, 1);

            gifMedia.Play();

        }

    }

}