是否有一个.NET集合接口阻止添加对象？ [英] Is there a .NET collection interface that prevents adding objects?

问题描述

我有一个类维护另一个类的对象列表。对象列表是一个公共属性。我想阻止用户直接添加和删除对象到列表，像这样：

  MyObject.MyListProperty.Add（object）; 
  

而是我希望他们使用方法在内部做一些处理，然后添加对象到列表。 / p>

我有一些想法：

• 创建 < T> 并覆盖添加和删除


• 通过属性getter返回列表的新副本（列表相对较短，不超过30个对象） >
  

有没有添加和删除的收集界面？

编辑：

我将使用 ReadOnlyCollection< T& code>。原因是包装的集合可以更新，并且更改将立即在只读对象中可见（请参阅 ReadOnlyCollection< T> 和 AsReadOnly（） ）。这允许只创建一次只读列表。

IEnumerable 的问题是对象可以回复到原始 List< T>

您可以使用 http://msdn.microsoft.com/en-us/library/ms132474.aspxrel =nofollow noreferrer> ReadOnlyCollection - 将您的收藏包装在此并返回 ReadOnlyCollection 给你的类的用户：

  return new ReadOnlyCollection（innerCollection）; 
  

或使用 AsReadOnly code> List< T> class：

  return innerCollection.AsReadOnly 
  

IEnumerable 接口将做你需要的，因为它只有一个成员 GetEnumerator（） ，这只会让你遍历项目。

I have a class that maintains list of objects of another class. List of objects is a public property. I would like to prevent users from adding and removing objects directly to list like this:

      MyObject.MyListProperty.Add(object);

Instead I want them to use method that will internally do some processing and then add object to list.

I have some ideas:

• create descendant of List<T> and override add and remove
• return fresh copy of list through property getter (list is relatively short, not more than 30 objects)

Is there some collection interface that does not have Add and Remove?

Edit:
I'm going to go with ReadOnlyCollection<T>. Reason is that wrapped collection can be updated and changes will be immediately visible in read only object (see MSDN code examples for ReadOnlyCollection<T> and AsReadOnly()). This allows that read only list be created only once.

The problem with IEnumerable is that object can be casted back to original List<T> and then directly manipulated.

解决方案

You can use ReadOnlyCollection - wrap your collection in this and return the ReadOnlyCollection to users of your class:

return new ReadOnlyCollection(innerCollection);

Or using the AsReadOnly method of the List<T> class:

return innerCollection.AsReadOnly();

The IEnumerable interface will do what you need, as it only has one member GetEnumerator(), that will only let you iterate over items.

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