我无法理解为什么C#中的数组是协变的,以及这种协方差带来的好处.考虑以下简单的代码示例：
object[] myArray = new string[1]; myArray[0] = 1;
这段代码可以正常编译,但是会毫不客气地在运行时爆炸.
如果我尝试使用泛型尝试同样的事情,编译器会抱怨我,我会在早期意识到我的愚蠢,所以我的问题是：为什么C#编译器允许这种与数组的协方差,而且,什么是潜在的好处？
解决方法
Eric Lippert说：
Unfortunately,this particular kind of covariance is broken. It was added to the CLR because Java requires it and the CLR designers wanted to be able to support Java-like languages. We then up and added it to C# because it was in the CLR. This decision was quite controversial at the time and I am not very happy about it,but there’s nothing we can do about it now.
