在这个范例中，巢状类别会隐藏基底类别中具有相同名称的类别。
In this example, a nested class hides a class that has the same name in the base class.
在衍生类别中覆写时，使用指定的系结条件约束搜寻指定的巢状型别。
When overridden in a derived class, searches for the specified nested type, using the specified binding constraints.
受保护的型别适用于进阶自订案例中的子类别和巢状型别。
Protected types can be used in subclasses and nested types in advance customization scenarios.
受保护的型别适用于进阶自订案例中的子类别和巢状型别。
Protected types can be used in subclasses and nested types in advance customization scenarios.
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