从FieldInfo.GetValue返回的对象不能转换为Array(Object returned from FieldInfo.GetValue cannot be cast to Array)

从FieldInfo.GetValue返回的对象不能转换为Array(Object returned from FieldInfo.GetValue cannot be cast to Array)

我正在使用PCL（Profile7），并且我遇到了fieldInfo.GetValue(myItem)返回的对象无法转换为数组的问题。

在使用As时，我在直接转换中获得了转换异常（显然）为null

我如何将这个对象转换为集合？

注意：我不知道该类型是什么，因为我无法访问它。 这是我正在消费的图书馆的内部

I'm working in a PCL (Profile7), and I've got an issue where the object returned from fieldInfo.GetValue(myItem) cannot be cast to an array.

I get a cast exception on a direct cast and (obviously) null when using As

how do I cast this object to a collection?

note: I have no idea what the type is as I don't have access to it. It's internal to the library I'm consuming

最满意答案

检查dynamicProperties对象的类型，它在您显示的调试器屏幕截图中不可见。 很可能它是某种List<> 。

只有当它是一个引用类型数组（如string[]或object[] ，您才会尝试成功，如果类型是结构体，它将会失败，如此问题所示： object to string array

在任何情况下， IReadOnlyCollection<T> ， IReadOnlyList<T>和IEnumerable<T>接口都是协变的，您可以尝试转换为IEnumerable<object> ，或者如果您需要更多信息，例如计数或索引器访问，其他接口。

Check the type of the dynamicProperties object, it's not visible in the debugger screenshot that you showed. Most likely it's a List<> of some sort.

The cast you attempt only succeeds if it's an array of reference types (e.g. string[] or object[], it will fail if the type is a struct, as illustrated in this question: object to string array

In any case, the IReadOnlyCollection<T>, IReadOnlyList<T> and IEnumerable<T> interfaces are covariant, you could try casting to IEnumerable<object>, or if you need more information such as count or indexer access, try one of the other interfaces.