如何解决 Generic.IList.this[] 和 IList.this[] 之间的调用歧义？
我有一个集合，它实现了一个扩展 IList
public Interface IMySpecialCollection : IList<MyObject>, IList { ... }
这意味着我有两个版本的索引器。
我希望使用通用实现，因此我通常实现该实现：
public MyObject this[int index] { .... }
我只需要 IList 版本进行序列化，因此我显式实现它，以将其隐藏：
object IList.this[int index] { ... }
但是，在我的单元测试中，以下
MyObject foo = target[0];
结果会导致编译器错误
调用之间不明确 以下方法或属性
我对此有点惊讶； 我相信我以前做过并且效果很好。 我在这里缺少什么？ 我怎样才能获得 IList
编辑 IList
再次编辑：我必须从界面中删除 IList 并将其移到我的班级上。 我不想这样做，因为实现该接口的类最终将被序列化为 Xaml，这需要集合来实现 IDictionary 或 IList...
I've got a collection that implements an interface that extends both IList<T> and List.
public Interface IMySpecialCollection : IList<MyObject>, IList { ... }
That means I have two versions of the indexer.
I wish the generic implementation to be used, so I implement that one normally:
public MyObject this[int index] { .... }
I only need the IList version for serialization, so I implement it explicitly, to keep it hidden:
object IList.this[int index] { ... }
However, in my unit tests, the following
MyObject foo = target[0];
results in a compiler error
The call is ambiguous between the
following methods or properties
I'm a bit surprised at this; I believe I've done it before and it works fine. What am I missing here? How can I get IList<T> and IList to coexist within the same interface?
Edit IList<T> does not implement IList, and I must implement IList for serialization. I'm not interested in workarounds, I want to know what I'm missing.
Edit again: I've had to drop IList from the interface and move it on my class. I don't want to do this, as classes that implement the interface are eventually going to be serialized to Xaml, which requires collections to implement IDictionary or IList...
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不幸的是，您不能声明具有相同参数列表的两个索引器。 以下段落摘自此处 C# 编程指南 - 使用索引器“备注”部分：
如果您希望使用第二个索引器，则必须声明一组不同的参数。
Unfortunately you can't declare two indexers with the same parameter list. The following paragraph is taken from here C# Programming Guide - Using Indexers "Remarks" section:
You will have to declare a different set of parameters if you wish to use the second indexer.
将您的通用实现更改为...
这明确说明了哪个“这个”是哪个。
Change your generic implementation to...
This explicitly says which 'this' is which.
这是我的问题的骗局
总结，如果你这样做，它就解决了问题：
This is a dupe of my question here
To summarise, if you do this, it solves the problem:
您不能使用
public interface IMySpecialCollection : IList, IList { ... } 执行此操作，
但是您可以使用类执行您想要的操作，您需要实现以下之一接口明确。 在我的示例中，我明确了 IList。
public class MySpecialCollection : IList, IList { ... } IList您是否考虑过让 IMySpecialCollection 实现 ISerializable 来进行序列化？
支持多种集合类型对我来说似乎有点错误。 您可能还想考虑将 IList 转换为 IEnumerable 进行序列化，因为 IList 仅包装 IEnumerable 和 ICollection。
You can't do this with
public interface IMySpecialCollection : IList<MyObject>, IList { ... }But you can do what you want with a class, you will need to make the implementations for one of the interfaces explicit. In my example I made IList explicit.
public class MySpecialCollection : IList<MyObject>, IList { ... }IList<object> myspecialcollection = new MySpecialCollection();IList list = (IList)myspecialcollection;
Have you considered having IMySpecialCollection implement ISerializable for serialization?
Supporting multiple collection types seems a bit wrong to me. You may also want to look at casting yout IList to IEnumerable for serialization since IList just wraps IEnumerable and ICollection.
列表暗示了 IList，所以在同一个类中使用两者是一个坏主意。
List<T> implies IList, so it's a bad idea to use both in the same class.