c# – 如何创建包含(并显示)其他UIElements作为子项的自定义UIElement派生类？

public class UIElementContainer : UIElement
{
    private readonly UIElementCollection children;

    public UIElementContainer()
    {
        children = new UIElementCollection(this,null);
    }

    public void AddChild(UIElement element)
    {
        children.Add(element);
    }

    public void RemoveChild(UIElement element)
    {
        children.Remove(element);
    }

    protected overridE int VisualChildrenCount
    {
        get { return children.Count; }
    }

    protected override Visual GetVisualChild(int indeX)
    {
        return children[index];
    }

    protected override Size MeasureCore(Size availableSizE)
    {
        foreach (UIElement element in children)
        {
            element.Measure(availableSizE);
        }

        return new Size();
    }

    protected override void ArrangeCore(Rect finalRect)
    {
        foreach (UIElement element in children)
        {
            element.Arrange(finalRect);
        }
    }
}

不需要具有UIElementCollection.另一种实现可能如下所示：

public class UIElementContainer : UIElement
{
    private readonly List<UIElement> children = new List<UIElement>();

    public void AddChild(UIElement element)
    {
        children.Add(element);
        AddVisualChild(element);
    }

    public void RemoveChild(UIElement element)
    {
        if (children.Remove(element))
        {
            RemoveVisualChild(element);
        }
    }

    // plus the four overrides
}