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