[英]Test whether an object implements a generic interface for any generic type
I want to test an object to see if it implements IDictionary<TKey,TValue>
but I don't care what TKey
and TValue
are. 我想测试一个对象,看它是否实现了IDictionary<TKey,TValue>
但我不关心TKey
和TValue
是什么。
I can test if is a concrete instance of the framework Dictionary<,>
like this: 我可以测试是否是框架Dictionary<,>
的具体实例Dictionary<,>
如下所示:
bool isDict = type.IsGenericType &&
(typeof(Dictionary<,>).IsAssignableFrom(type.GetGenericTypeDefinition());
but I can't think of a way to test for something that implements IDictionary<,>
. 但我想不出一种方法来测试实现IDictionary<,>
东西。 This technique doesn't work for the interface; 这种技术不适用于界面; IsAssignableFrom
return false if I test against the generic base type IDictionary<,>
, which seems odd since it works for the concrete type. 如果我对通用基类型IDictionary<,>
测试,则IsAssignableFrom
返回false,这似乎很奇怪,因为它适用于具体类型。
Normally you would use is
to test if something implements an interface, but of course this only works if I want to test for a specific generic interface. 通常你会使用is
来测试某些东西是否实现了一个接口,当然这只有在我想测试一个特定的通用接口时才有效。 Or I would just test for a common ancestral interface, but unlike other generic data structures such as IList<>
and ICollection<>
, there is no unique non-generic interface from which the generic IDictionary<TKey,TValue>
inherits. 或者我只测试一个共同的祖先接口,但与其他通用数据结构(如IList<>
和ICollection<>
,没有唯一的非泛型接口,泛型IDictionary<TKey,TValue>
继承该接口。
How about something like 怎么样的
return type.GetInterfaces()
.Where(t => t.IsGenericType)
.Select(t => t.GetGenericTypeDefinition())
.Any(t => t.Equals(typeof(IDictionary<,>)));
which I'm sure that you can easily generalize for any generic type definition. 我相信你可以很容易地推广任何泛型类型定义。
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