ICollection 与 ICollection- ICollection.Count 和 ICollection.Count 之间的歧义
注意：这与另一个问题类似，但不完全相同，
我已经实现了一个IBusinessCollection 接口。它源自 ICollection 和过时的非泛型 ICollection。我宁愿转储旧的 ICollection ，但我正在使用带有 CollectionView 的 WPF 数据绑定，它希望我实现旧的非通用 IList ： -（
无论如何，接口看起来像这样：
public interface IBusinessCollection<T> : ICollection<T>, ICollection
{ }
public interface ICollection<T>
{ int Count { get; } }
public interface ICollection
{ int Count { get; } }
由于使用依赖注入，我使用它们的接口传递 IBusinessCollection 类型的对象，而不是通过具体类型，所以我有这样的事情：
internal class AnonymousCollection : IBusinessCollection<string>
{
public int Count { get { return 5; } }
}
public class Factory
{
public static IBusinessCollection<string> Get()
{ return new AnonymousCollection(); }
}
当我尝试调用此代码时，出现错误，如下所示：
var counter = Factory.Get();
counter.Count; // Won't compile
// Ambiguity between 'ICollection<string>.Count' and 'ICollection.Count'
有 3 种方法可以进行编译，但它们都很丑陋
将类转换为其具体实现。 （我可能不知道）
将类显式转换为
ICollection将类显式转换为
ICollection
是否有第四个选项根本不需要我投射东西？我可以对 IBusinessCollection 进行任何需要的更改
Note: This is similar, but not quite the same as this other question
I've implemented an IBusinessCollection interface. It dervies from both ICollection<T>, and the old-busted non-generic ICollection. I'd prefer to just dump the old busted ICollection, but I'm using WPF databinding with a CollectionView which wants me to implement the old-busted non-generic IList :-(
Anyway, the interfaces look like this:
public interface IBusinessCollection<T> : ICollection<T>, ICollection
{ }
public interface ICollection<T>
{ int Count { get; } }
public interface ICollection
{ int Count { get; } }
Due to using Dependency Injection, I'm passing around objects of type IBusinessCollection<T> using their interfaces, not by concrete types, so I have something like this:
internal class AnonymousCollection : IBusinessCollection<string>
{
public int Count { get { return 5; } }
}
public class Factory
{
public static IBusinessCollection<string> Get()
{ return new AnonymousCollection(); }
}
When I try and call this code, I get an error, as follows:
var counter = Factory.Get();
counter.Count; // Won't compile
// Ambiguity between 'ICollection<string>.Count' and 'ICollection.Count'
There are 3 ways to make this compile, but all of them are ugly.
Cast the class to it's concrete implementation (which I may not know)
Cast the class explicitly to
ICollectionCast the class explicitly to
ICollection<T>
Is there a fourth option which doesn't require me to cast things at all? I can make whatever changes I need to IBusinessCollection<T>
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这似乎解决了我的快速测试中的问题。
This appears to solve the issues in my quick tests.