带圆角的图片显示

        <Grid
            Width="200"
            Height="200"
            Margin="0,0,0,0"
            HorizontalAlignment="Center"
            VerticalAlignment="Center">

            <Border
                Name="Mask"
                Grid.RowSpan="2"
                Margin="-5"
                Background="Black"
                CornerRadius="18" />

            <Grid Grid.RowSpan="2">
                <Grid.OpacityMask>
                    <VisualBrush Visual="{Binding ElementName=Mask}" />
                </Grid.OpacityMask>

                <Image
                    Margin="-5"
                    Source="F:/desktop/timg (1).jpg"
                    Stretch="UniformToFill" />
            </Grid>

        </Grid>