无法转换List< KeyValuePair< ...，...>>到IEnumerable< object>吗? [英] Can't convert List<KeyValuePair<...,...>> to IEnumerable<object>?

问题描述

尝试这样的操作时获取InvalidCastException:

Getting an InvalidCastException when trying something like this :

IEnumerable<object> test = (IEnumerable<object>)new List<KeyValuePair<string, int>>();

但是，这确实可行:

IEnumerable<object> test = (IEnumerable<object>)new List<Dictionary<string, int>>();

那么最大的区别是什么?为什么不能将KeyValuePair转换为对象?

So what's the big difference? Why can a KeyValuePair not be converted to an object?

更新:我可能应该指出这确实有效:

Update: I should probably point out that this did work:

object test = (object)KeyValuePair<string,string>;

推荐答案

因为它是结构而不是类:

Because it is a struct, and not a class : http://msdn.microsoft.com/en-us/library/5tbh8a42.aspx

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