作者： yww

被选中进入逻辑树里元素类型列表

http://www.cnblogs.com/idior/archive/2010/06/04/1751738.html

The secret is behind a property called LogicalChildren. Panel, ItemsControl, ContentControl, and Decorator, which are the most common base classes, all define this property make the logical tree operate already.
LogicalChildren是用来实现以下列出的功能的，定义在基类FrameworkElement之上,而原文的列表里的Items,Children，Content之类的的属性是各个类自己维护的属性。LogicalChildren是以下关键能力实现的基础：
继承DependencyProperty（wpf的重要而容易被忽略的特性就是dp可以从树上的父元素获得）
DynamicResource的寻找
对名字的支持（NameScope传递)
RoutedEvent的发生和传导
 

基础知识篇:c#里的参数传递

http://www.yoda.arachsys.com/csharp/parameters.html

it is highly confusing to say that objects are passed by reference by default instead of the correct statement that object references are passed by value by default.
默认是值传递方式的参数传递,也就是没有addr指令来访问的。虽然可以改变同一份指向的东西,但是毕竟是有个新的引用变量。