形状是WPF另一大系列控件。WPF所有的形状都继承于Shape基类。那么，WPF提供了哪些可用的形状呢？我们用一张图来说明它的子类。

Shape是一个抽象基类，它不能被实例化，所以我们在使用时只能实例化它的子类。而Shape的父类是FrameworkElement，所以，所有的Shape子类都是一个UIElement 类，因此形状对象可以用在面板和大多数控件中。 由于 Canvas 面板支持其子对象的绝对位置，因此特别适合创建复杂的图形。

我们来看看Shape的定义

一、Shape的定义

public abstract class Shape : FrameworkElement
{
    public static readonly DependencyProperty StretchProperty;
    public static readonly DependencyProperty StrokeDashArrayProperty;
    public static readonly DependencyProperty StrokeDashOffsetProperty;
    public static readonly DependencyProperty StrokeLineJoinProperty;
    public static readonly DependencyProperty StrokeDashCapProperty;
    public static readonly DependencyProperty StrokeMiterLimitProperty;
    public static readonly DependencyProperty StrokeStartLineCapProperty;
    public static readonly DependencyProperty StrokeThicknessProperty;
    public static readonly DependencyProperty StrokeProperty;
    public static readonly DependencyProperty FillProperty;
    public static readonly DependencyProperty StrokeEndLineCapProperty;

    protected Shape();

    public Brush Stroke { get; set; }
    public PenLineCap StrokeEndLineCap { get; set; }
    public PenLineCap StrokeStartLineCap { get; set; }
    public double StrokeThickness { get; set; }
    public Brush Fill { get; set; }
    public double StrokeDashOffset { get; set; }
    public virtual Geometry RenderedGeometry { get; }
    public Stretch Stretch { get; set; }
    public DoubleCollection StrokeDashArray { get; set; }
    public double StrokeMiterLimit { get; set; }
    public PenLineCap StrokeDashCap { get; set; }
    public virtual Transform GeometryTransform { get; }
    public PenLineJoin StrokeLineJoin { get; set; }
    protected abstract Geometry DefiningGeometry { get; }

    protected override Size ArrangeOverride(Size finalSize);
    protected override Size MeasureOverride(Size constraint);
    protected override void OnRender(DrawingContext drawingContext);

}

Shape基类提供了许多公共属性，如下表所示。

二、属性成员