Is there a way to achieve covariance of generic types in C# 3.0?
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by nullDev
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Published on 2010-04-05T13:21:58Z
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2010/04/05
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This has been introduced in C# 4.0, but is there a way to achieve this in c# 3.0?
For e.g., consider the following code:
class Base
{
}
class Derived1 : Base
{
}
class Derived2 : Base
{
}
class User<T> where T : Base
{
}
class User1 : User<Derived1>
{
}
Now, I would like to have a list of User<T>, in which I can store User<Derived1> as well as User<Derived2>, but the following code fails to compile in C# 3.0:
List<User<Base>> users = new List<User<Base>>();
users.Add(new User1());
Any ideas?
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