如何从字典中获取特定类型的键 - 值对(How to Get Key-Value Pairs of a Specific Type Only from Dictionary)

 我有一个IDictionary（不是泛型的，所以我在这里处理object ），并且我只想从它获得该IDictionary中对应于特定键类型K和特定值类型V的元素。十亿种方法来做到这一点，但我发现的最优雅的方式似乎是这样的： 
 
Dictionary<K, V> dict = myIDictionary.OfType<KeyValuePair<K, V>>();
 
 这个编译好，所以我假设这个方法可以用于字典（它由IEnumerable声明），但生成的字典是空的，虽然肯定有KVP满足这些条件。 很显然，我假定KeyValuePair<K, V>是它期望的格式，因为这是在字典上枚举时使用的，但是它是其他内容吗？ 有什么我失踪？ 

I have an IDictionary (not generic, so I am dealing with object's here), and I would like to get from it only the elements in that IDictionary which correspond to a specific key type K and a specific value type V. There are a billion ways to do this, but the most elegant way I have found seems to be this:
 
Dictionary<K, V> dict = myIDictionary.OfType<KeyValuePair<K, V>>();
 
This compiles fine so I am assuming this method CAN work for a dictionary (it's declared by IEnumerable) but the resulting dictionary is empty, although there are definitely KVPs in there that meet those conditions. Obviously I was assuming that KeyValuePair<K, V> is the format it is expecting, since that's what's used in enumeration over a dictionary, but is it something else? Is there something I'm missing?

原文：https://stackoverflow.com/questions/18662791