generic derived type
常见例句
- Covariance enables you to use a more derived type than that specified by the generic parameter.
通过协变，可以使用与泛型参数指定的派生类型相比，派生程度更大的类型。 - A covariant delegate can be assigned another delegate of the same type, but with a more derived generic type parameter.
可以向协变委托分配同一类型的其他委托，但需使用派生程度较大的泛型类型参数。 - A contravariant delegate can be assigned another delegate of the same type, but with a less derived generic type parameter.
可以向逆变委托分配同一类型的其他委托，但需使用派生程度较小的泛型类型参数。 返回 generic derived type