[英]In a derived class, how to have a property of a derived type from the type of the property in the base class?
This is a huge design problem that I often encounter and I think it is because I don't understand OOP right. 这是我经常遇到的巨大设计问题,我认为这是因为我对OOP的理解不正确。
Here is the class of the base Property : 这是基本Property的类:
public class BasePropety {}
Here is the type of my DerivedProperty: 这是我的DerivedProperty的类型:
public class DerivedProperty : BaseProperty
{
public AClass A { get; set; }
}
Here is my base class : 这是我的基类:
public class BaseClass
{
public BaseProperty Property { get; set; }
}
Here my derived class : 这是我的派生类:
public class DerivedClass : BaseClass
{
public DerivedProperty Property { get; set; }
public void MethodExample()
{
AClass aValue = this.Property.A;
}
}
I could of course typecast my property but it is annoying: 我当然可以打字我的财产,但这很烦人:
public class DerivedClass : BaseClass
{
public void MethodExample()
{
var typedProperty = (DerivedProperty) this.Property;
AClass aValue = typedProperty.A;
}
}
I know I can use the new keyword but I read here and there that it is a bad practice, so how I am suppose to achieve this ? 我知道我可以使用new关键字,但是我在这里和那里读到这是一个不好的做法,那么我应该如何实现呢? Should I create a new property ?
我应该创建一个新财产吗?
Thanks in advance for your answers. 预先感谢您的回答。
Sounds like you need generics instead: 听起来您需要泛型:
public class BaseClass<T> where T : BaseProperty
{
public T Property { get; set; }
}
public class DerivedClass : BaseClass<DerivedProperty>
{
public void MethodExample()
{
AClass aValue = Property.A;
}
}
Note that this means there's only one property - whereas in your current code, you actually have two independent properties, which happen to have the same name. 请注意,这意味着只有一个属性-而在当前代码中,实际上您有两个独立的属性,它们恰好具有相同的名称。 I suspect you don't want that.
我怀疑你不想那样。
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