'宣言 Public MustInherit Class MenuBaseBuilder (Of T,TControl As MenuBase(Of T), TBuilder As MenuBaseBuilder(Of T,TControl,TBuilder)) Inherits ComboBoxBaseBuilder(Of T,TControl,TBuilder)
public abstract class MenuBaseBuilder<T,TControl,TBuilder> : ComboBoxBaseBuilder<T,TControl,TBuilder> where TControl: MenuBase<T> where TBuilder: MenuBaseBuilder<T,TControl,TBuilder>