如何从用C#编写的抽象基类继承

Question

我试图使用Python.NET(2.1.0)继承Python(2.7)中的抽象.NET基类.我是Python n00b,但据我所知...

这是我在Python中设法做的事情,并且工作正常:

import abc

class Door(object):
    __metaclass__ = abc.ABCMeta

    def open(self):
        if not self.is_open():
            self.toggle()

    def close(self):
        if self.is_open():
            self.toggle()

    @abc.abstractmethod
    def is_open(self):
        pass

    @abc.abstractmethod
    def toggle(self):
        pass

class StringDoor(Door):
    def __init__(self):
        self.status = "closed"

    def is_open(self):
        return self.status == "open"

    def toggle(self):
        if self.status == "open":
            self.status = "closed"
        else:
            self.status = "open"

class BooleanDoor(Door):
    def __init__(self):
        self.status = True

    def is_open(self):
        return self.status

    def toggle(self):
        self.status = not (self.status)

Door.register(StringDoor)
Door.register(BooleanDoor)

现在,我所做的只是用C#表示替换抽象基类Door:

namespace PythonAbstractBaseClass
{
    public abstract class Door
    {
        public virtual void Open()
        {
            if (!IsOpen())
                Toggle();
        }

        public virtual void Close()
        {
            if (IsOpen())
                Toggle();
        }

        public abstract bool IsOpen();
        public abstract void Toggle();
    }
}

从Python部件中删除Door并从.NET程序集中导入它,我最终得到:

import clr
import abc
from PythonAbstractBaseClass import Door

class StringDoor(Door):
    def __init__(self):
        self.status = "closed"

    def is_open(self):
        return self.status == "open"

    def toggle(self):
        if self.status == "open":
            self.status = "closed"
        else:
            self.status = "open"

class BooleanDoor(Door):
    def __init__(self):
        self.status = True

    def is_open(self):
        return self.status

    def toggle(self):
        self.status = not (self.status)

Door.register(StringDoor)
Door.register(BooleanDoor)

但是这失败并出现以下错误消息:

    Door.register(StringDoor)
AttributeError: type object 'Door' has no attribute 'register'

根据我的理解abc.ABCMeta,这个元类贡献了这种register()方法.似乎抽象的C#类没有相同的元类.相反,它们带有CLR Metatype明显无法提供的元类register().

但是如果我放弃调用register(),在实例化其中一个派生类时,我收到错误消息

    sdoor = StringDoor()
TypeError: cannot instantiate abstract class

有没有办法从抽象的.NET类继承或者这是一个缺少的功能？

提前致谢,

亨宁

Answer 1

您无法在C#中创建抽象类的新实例.也就是说,Python会要求你使用寄存器,因为它不允许你使用你继承的类而不注册它,除非你实例化它.

如果你想继承python中的C#抽象类,你必须在C#类中自己编写python中寄存器类的表示,这样就会注册你的抽象调用并能够继承它.

如果需要,我建议这个网站可以轻松帮助您在代码之间进行转换:

https://www.varycode.com/converter.html

Answer 2

我对pythonnet(或者一般的python)完全不熟悉,但我很好奇这样的事情是否可行:

import clr
import abc
from PythonAbstractBaseClass import Door

class DoorWrapper(Door):
    __metaclass__ = abc.ABCMeta

class StringDoor(DoorWrapper):
  ...

class BooleanDoor(DoorWrapper):
  ...

DoorWrapper.register(StringDoor)
DoorWrapper.register(BooleanDoor)