.net - Vb.net接口(interface)，make方法只接受相同类型的实例作为参数

Question

我试图在我的 vb.net 接口(interface)中定义一个方法，该方法只接受从同一接口(interface)继承的对象，并且与接收方法调用的实例属于同一类。这在 vb.net 中可能吗？

下面我尝试用(无效的)泛型类型约束来说明我希望做什么:

Public Interface IFoo

   CompareStuff(Of T as sametype)(obj as T) as Boolean

End Interface

Answer 1

您正在寻找Curiously recurring template pattern 。

我对 VB 有点生疏，所以这里是用 C# 编写的

public interface IFoo<T>
    where T : IFoo<T>
{
    bool CompareStuff(T obj);
}

然后你就这样实现

public class Foo : IFoo<Foo>
{
    bool CompareStuff(Foo obj);
}

查看this article埃里克·利珀特(Eric Lippert)介绍了这一点。特别注意他说的结尾:

My advice is to think very hard before you implement this sort of curious pattern in C#; do the benefits to the customer really outweigh the costs associated with the mental burden you're placing on the code maintainers?