WPF ImageControl描边图片

    [TemplatePart(Name = "PART_Highlight", Type = typeof(Image))]
    public class ImageControl : Control
    {
        Image HighLightImage = null;

        public bool IsHighLight
        {
            get { return (bool)GetValue(IsHighLightProperty); }
            set { SetValue(IsHighLightProperty, value); }
        }

        public static readonly DependencyProperty IsHighLightProperty =
            DependencyProperty.Register("IsHighLight", typeof(bool), typeof(ImageControl), new FrameworkPropertyMetadata(false, propertyChangedCallback: OnIsHighLightChanged));

        private static void OnIsHighLightChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var ic = d as ImageControl;
            if((bool)e.NewValue)
            {
                ic.HighLightImage.Visibility = Visibility.Visible;
                string path = ic.Source.ToString().Replace("file:///", string.Empty);
                byte[] bs = null;
                using (var bitmap = new System.Drawing.Bitmap(path))
                    bs = bitmap.GetVerge1(true);
                WriteableBitmap wb = new WriteableBitmap((int)ic.Source.Width + 2, (int)ic.Source.Height + 2, 96, 96, PixelFormats.Bgra32, null);
                wb.Lock();
                wb.WritePixels(new Int32Rect(0, 0, wb.PixelWidth, wb.PixelHeight), bs, wb.PixelWidth * 4, 0);
                wb.Unlock();
                ic.HighLightImage.Source = wb;
            }
            else
            {
                ic.HighLightImage.Source = null;
            }
        }

        public ImageSource Source
        {
            get { return (ImageSource)GetValue(SourceProperty); }
            set { SetValue(SourceProperty, value); }
        }

        public static readonly DependencyProperty SourceProperty =
            DependencyProperty.Register("Source", typeof(ImageSource), typeof(ImageControl), new FrameworkPropertyMetadata((ImageSource)null));

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            HighLightImage = GetTemplateChild("PART_Highlight") as Image;
        }

        protected override void OnMouseEnter(MouseEventArgs e)
        {
            IsHighLight = true;
            base.OnMouseEnter(e);
        }

        protected override void OnMouseLeave(MouseEventArgs e)
        {
            IsHighLight = false;
            base.OnMouseLeave(e);
        }
    }

样式：

<Style TargetType="local:ImageControl">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="local:ImageControl">
                        <Canvas>
                            <Image Source="{TemplateBinding Source}"/>
                            <Image Name="PART_Highlight" IsHitTestVisible="False" Canvas.Left="-1" Canvas.Top="-1"/>
                        </Canvas>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

使用：

<local:ImageControl x:Name="img" Source="D:\1.png" />