为什么不在 VB.NET 中的 Web 服务参数中公开 List(Of String)？
FxCop 在一条规则中表示，通用列表不应向外界公开。
但我不明白为什么以及通用列表的替代品是什么？
参考：http://msdn.microsoft.com/ en-in/library/ms182142%28en-us%29.aspx
Possible Duplicate:
C#: Difference between List<T> and Collection<T> (CA1002, Do not expose generic lists)
The FxCop says in a rule that generic List should not be exposed to the outside world.
But I do not understand why and what is the replacement for the generice List?
Reference : http://msdn.microsoft.com/en-in/library/ms182142%28en-us%29.aspx
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原因是使用具体的
List意味着实现细节，并且您应该公开一些更抽象的东西，例如IEnumerablecode> 或ICollection，仅表示您想要公开的功能（例如可枚举、可变和/或可索引）。这使您可以灵活地稍后更改实现。在实践中，通常通过返回
IList而不是List来解决此警告，但其想法是提示您思考“什么功能我实际上需要来保证我的呼叫者吗？”例如，也许我应该返回IEnumerable或ReadOnlyCollection因为我不希望我的调用者弄乱返回的集合。The reason is that the use of a concrete
List<T>is meant to be an implementation detail, and you're meant to expose something more abstract, such asIEnumerable<T>orICollection<T>, that represents only the functionality you want to expose (such as being enumerable, mutable and/or indexable). This gives you flexibility to change the implementation later on.In practice, this warning is often resolved by returning
IList<T>instead ofList<T>, but the idea is to prompt you to think about "what functionality do I actually need to guarantee my callers?" E.g. maybe I should be returningIEnumerable<T>orReadOnlyCollection<T>because I don't want my callers messing with the returned collection.始终公开对象层次结构中适合您的场景的最低基类/接口。例如，如果此属性的使用者仅要对其进行迭代，请使用
IEnumerable(Of T)。通过公开List，您将通过允许客户端代码访问您的类的实现细节来破坏封装。Always expose the lowest base class/interface in the object hierarchy that will be suitable for your scenario. For example if consumers of this property are going to only iterate over it use
IEnumerable(Of T). By exposing aList<T>you are breaking encapsulation by giving client code access to an implementation detail of your class.通用列表是 .NET 构造，但是 Web 服务通常旨在与其他框架进行互操作。
A generic list is a .NET construct, however web services are often intended to be interoperable with other frameworks.