如何定义一个继承泛型抽象类的泛型抽象类？

Question

我有一个继承抽象类的类，该类继承了另一个抽象类。我可以将最超类定义为泛型就好了，但是在我在最终ListResults类中表达我想要的实际类型之前，我不知道如何将中间类定义为泛型。internal abstract class LowerCommand<T> {    public abstract void Execute();    public abstract List<T> ExecuteList();}// currently gives error for `T`internal abstract class HigherCommand : Lowercommand<T> {    // ... defines other stuff, nothing to do with    //     already instantiated methods or T ...}class ListResults : HigherCommand<Results>{    public override void Execute() {...}    public override List<Results> ExecuteList() {...}}感谢您的帮助。

Answer 1

您仍然需要在定义上定义泛型类型参数T，HigherCommand以便它可以依次正确定义LowerComand.

internal abstract class LowerCommand<T> {

    public abstract void Execute();

    public abstract List<T> ExecuteList();

}

// Note that HigherCommand require a declaration of `T`

internal abstract class HigherCommand<T> : Lowercommand<T> {

    // ... defines other stuff, nothing to do with

    //     already instantiated methods or T ...

}

class ListResults : HigherCommand<Results>

{

    public override void Execute() {...}

    public override List<Results> ExecuteList() {...}

}