WPF显示图片

1、WPF显示图片内部一部分

<Rectangle  Height="12" Width="60">
            <Rectangle.Fill >
                <ImageBrush  ImageSource="Picicon_tubiao1.png"  ViewboxUnits="Absolute" Viewbox="448,407,60,12"></ImageBrush>
            </Rectangle.Fill>
        </Rectangle>