在.NET中初始化基类 [英] Initialize base class in .NET

问题描述

如果我需要使用现有对象初始化对象的基础，该怎么办?例如，在这种情况下:

How do I go about if I need to initialize an object's base with existing object? For example, in this scenario:

public class A
{
    public string field1;
    public string field2;
}

public class B : A
{
    public string field3;
    public void Assign(A source)
    {
        this.base = source; // <-- will not work, what can I do here?
    }
}

Assign()方法显然可以逐字段为基类分配值，但是没有更好的解决方案吗?由于类B继承自A，因此必须有一种方法可以将A分配给B.base

Assign() method can, obviously assign values to the base class field-by-field, but isn't there a better solution? Since class B inherits from A, there must be a way to just assign A to the B.base

在C ++中，这是一件微不足道的事情，但是我似乎无法掌握如何在.NET中做到这一点

In C++ this would be a trivial thing to do, but I can't seem to grasp how to do this in .NET

推荐答案

不幸的是，base是只读的.

好吧，也许不是那么不幸.基类和子类之间的关系是IS-A而不是HAS-A.通过允许子类更改基类的实例，可以允许子类更改其自身的引用，因为它是IS-A基类.如果您确实需要此功能，那么我建议您更改继承模型以反映您真正想要做的事情.

Well perhaps not so unfortunate. The relationship between a base class and a child class is IS-A not HAS-A. By allowing a child class to change the instance of the base class you are allowing the child class to change its own reference since it IS-A base class. If you truly need this functionality then I would suggest you change your inheritance model to reflect what you truly want to do.

类似这样的东西:

public class A
{
    public string field1;
    public string field2;
}

public class B
{
    public string field3;
    public A a;

    public void Assign(A source)
    {
        this.a = source;
    }
}

似乎更合适，并且含义和功能更清晰.

seems more appropriate and has clearer meaning and functionality.

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