.NET抽象类。 [英] .NET abstract classes.
问题描述
我设计了一个网站导航层次结构。这是一个节点树。
I'm designing a web site navigation hierarchy. It's a tree of nodes.
大多数节点页面。一些节点的链接（在Windows思快捷方式）。
Most nodes are pages. Some nodes are links (think shortcuts in Windows).
大多数页面容纳HTML内容。一些执行code。
Most pages hold HTML content. Some execute code.
我想重新present这些作为类和抽象（为MustInherit）类＆hellip这个集合;
I'd like to represent these as this collection of classes and abstract (MustInherit) classes…
这是数据库中的表，我要去哪里存储此与所有hellip;
This is the database table where I'm going to store all this…
在此处，我难倒。 PageNodes可能或可能不是根
Here's where I'm stumped. PageNodes may or may not be roots.
我应该如何处理根类？
我不希望必须具备全部四项＆hellip;
I don't want to have to have all four of…
- HtmlPageNode
- codePageNode
- 的Html **根** PageNode
- code ** **根PageNode
我想HtmlPageNode和codePageNode类继承的或者的从PageNode否则，从RootPageNode。这可能吗？
I want the HtmlPageNode and CodePageNode classes to inherit either from PageNode or else from RootPageNode. Is that possible?
澄清：有多个根节点和根部可有父节点。每个是仅一子树具有不同造型的根。想想不同，color- codeD部门。 （也许根本就是一个可怜的名字的选择。建议？）
Clarification: There are multiple root nodes and roots may have parent nodes. Each is the root of only a sub-tree that has distinct styling. Think of different, color-coded departments. (Perhaps root is a poor name choice. Suggestions?)
更新：关于根的名字......
我问：<一href="http://stackoverflow.com/questions/86790/is-there-a-specific-name-for-the-node-that-coresponds-to-a-subtree">Is那里的coresponds一个子树的节点，特定的名称？
Update: Regarding the "Root" name...
I've asked: Is there a specific name for the node that coresponds to a subtree?
推荐答案
使用的组合模式。
对于你的根结点，有没有在功能上的差异或区别是完全的外观？如果不同的是外观上唯一的，我建议你从你的PageNode有一个单独的样式类的关联。
With regard to your root nodes, are there differences in functionality or is the difference it entirely appearance? If the difference is appearance only I suggest you have an association with a separate Style class from your PageNode.
如果在功能上有分歧，你有很多类型的页面再想想使用修饰模式。
If there are differences in functionality AND you have lots of types of page then think about using the Decorator Pattern.
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