每个继承的类的C#静态实例成员

问题描述

请考虑以下示例:

interface IPropertyCollection
{
    public MethodWrapper GetPropertySetterByName(string name);
    //<<-- I want the implementation from A and B merged into here somehow
}
class A : IPropertyCollection
{
    static PropertyMap properties = new PropertyMap(typeof(A));
    public MethodWrapper GetPropertySetterByName(string name)
    {
        return properties.SomeFunc(name);
    }
}
class B : IPropertyCollection
{
    static PropertyMap properties = new PropertyMap(typeof(B));
    public MethodWrapper GetPropertySetterByName(string name)
    {
        return properties.SomeFunc(name);
    }
}

我希望每个类中都有一个静态成员，仅跟踪该类中的内容，并且我希望每个类的行为完全相同，但内容不同.每个静态成员只应跟踪一个类.我希望仅通过拥有任何IPropertyCollection的实例就可以访问类的静态成员.

I want to have a static member in each class keeping track of things in that class only and i want it to behave exactly the same for every class, but with different content. Each static member should only keep track of one single class. I want to be able to get access to the classes' static member by just having an instance of any IPropertyCollection.

类似这样的东西:

    IPropertyCollection a = new A();
    IPropertyCollection b = new B();
    a.GetPropertySetterByName("asdfsj");  //Should end up in static A.properties
    b.GetPropertySetterByName("asdfsj");  //Should end up in static B.properties

现在这将适用于我的示例代码，但是我不想在A和B以及其他50个类中重复所有这些行.

Now this will work with my example code but i don't want to repeat all those lines inside A and B and 50 other classes.

推荐答案

使用(奇怪地重复出现的)通用通用基类:

Use a (curiously recurring) generic common base class:

abstract class Base<T> : IPropertyCollection where T : Base<T> {
  static PropertyMap properties = new PropertyMap(typeof(T));
  public MethodWrapper GetPropertySetterByName(string name) {
      return properties.SomeFunc(name);
  }
}

class A : Base<A> { }
class B : Base<B> { }

由于基类是泛型的，因此将为每个不同的类型参数生成"其静态成员的不同版本".

Since the base class is generic, a different "version" of its static members will be "generated" for each different type parameter.

请谨慎使用邪恶的狗:-)

class Evil : Base<A> { } // will share A's static member...

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