Question about C# 4.0's generics covariance
- by devoured elysium
Having defined this interface:
public interface IInputBoxService<out T> {
bool ShowDialog();
T Result { get; }
}
Why does the following code work:
public class StringInputBoxService : IInputBoxService<string> {
...
}
...
IInputBoxService<object> service = new StringInputBoxService();
and this doesn't?:
public class IntegerInputBoxService : IInputBoxService<int> {
...
}
...
IInputBoxService<object> service = new IntegerInputBoxService();
Does it have anything to do with int being a value type? If yes, how can I circumvent this situation?
Thanks
