covariance in c#

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Is it possible to cast a List<Subclass> to List<Superclass> in C# 4.0?

Something along these lines:

class joe : human {}

List<joe> joes = GetJoes();

List<human> humanJoes = joes;

Isn't this what covariance is for?

if you can do:

human h = joe1 as human;

why shouldn't you be able to do

List<human> humans = joes as List<human>; 

than it wouldn't be legal to do (joe)humans[0] because that item has been down casted.. and everyone would be happy. Now the only alternative is to create a new List

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