WPF:剪切并保存图像

<Image Source="sample.jpg" x:Name="image">
    <Image.Clip>
        <RectangleGeometry Rect="0,0,300,300" />
    </Image.Clip>
    <Image.Triggers>
        <EventTrigger RoutedEvent="Image.Loaded">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation Duration="0:0:1" To="300" Storyboard.TargetProperty="Width" />
                    <DoubleAnimation Duration="0:0:1" To="300" Storyboard.TargetProperty="Height" />
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Image.Triggers>
</Image>

<SaveFileDialog x:Name="saveFileDialog" 
                 Title="Save Image" 
                 Filter="Image Files (*.jpg, *.jpeg, *.png, *.gif, *.bmp)" 
                 InitialDirectory="C:\Users\Public\Pictures\Sample Pictures" />

using (FileStream fs = new FileStream(saveFileDialog.FileName, FileMode.Create))
{
    image.SaveTo(fs);
}