public static void CovariantGeneric()
{
ICovariantGeneric<MiddleClass> genericMiddle = new CovariantGeneric<MiddleClass>();
// This is OK:
ICovariantGeneric<BaseClass> genericBase = genericMiddle;
// This will produce compile-time error:
// Cannot implicitly convert type 'ICovariantGeneric<MiddleClass>' to 'ICovariantGeneric<LastClass>'.
// An explicit conversion exists (are you missing a cast?)
//// ICovariantGeneric<LastClass> genericLast = genericMiddle;
}
public static void CovariantGeneric()
{
ICovariantGeneric <MiddleClass> genericMiddle = new CovariantGeneric <MiddleClass>();
MiddleClass result = genericMiddle.Method();
// This is OK here:
ICovariantGeneric <BaseClass> genericBase = genericMiddle;
BaseClass baseResult = genericBase.Method();
// This will produce compile-time error:
// Cannot implicitly convert type 'ICovariantGeneric<MiddleClass>' to 'ICovariantGeneric<LastClass>'.
// An explicit conversion exists (are you missing a cast?)
//// ICovariantGeneric<LastClass> genericLast = genericMiddle;
}