<Grid HorizontalAlignment="Center" VerticalAlignment="Center">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Grid Grid.Row="1">
            <Grid RenderTransformOrigin="0.5,0.5">
                <Grid.RenderTransform>
                    <!--旋转-->
                    <RotateTransform Angle="{Binding ElementName=angle, Path=Value}"/>
                </Grid.RenderTransform>
                <!--圆角半径-->
                <Border Name="mask" CornerRadius="{Binding ElementName=cornerRadius, Path=Value}" Background="White"/>
                <Grid>
                    <!--参考https://msdn.microsoft.com/zh-cn/library/bb979637(v=vs.95).aspx-->
                    <Grid.OpacityMask>
                        <VisualBrush Visual="{Binding ElementName=mask}"/>
                    </Grid.OpacityMask>
                    <!--这里可以放任何内容,均可实现圆角-->
                    <Image Source="1104200S231-18.jpg"/> 
                </Grid>
            </Grid>
        </Grid>
        <!--控制按钮-->
        <Grid Grid.Row="0" Background="#A0FFFFFF">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition/>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <TextBlock Grid.Column="0" Text="Corner radius"/>
            <Slider Grid.Column="1" Name="cornerRadius" Minimum="0" Maximum="400" Margin="5,0,5,0"/>
            <TextBlock Grid.Column="2" Text="Angle" Margin="5,0,0,0"/>
            <Slider Grid.Column="3" Name="angle" Minimum="0" Maximum="360" Margin="5,0,0,0"/>
        </Grid>
    </Grid>