C#-在子类中指定超类的类型参数? [英] C# - Specifying type parameters of super-class in sub-classes?

问题描述

我正在尝试在C#中执行以下操作.

I am trying to do the following in C#.

public class Parent<T> where T : Parent<???>
{
  public T Prop { get; set; }
}

public class Child : Parent<Child>
{
}

我该怎么办?

推荐答案

这很好:

public class Parent<T> where T : Parent<T>
{
  public T Prop { get; set; }
}

public class Child : Parent<Child>
{
}

请注意这一点，因为c#不会强制执行真正的Parent/Child关系.例如，鉴于上述代码，对我而言，这样做是合法的:

Do be careful with this as c# does not enforce a true Parent/Child relationship. For example, given the above code, it is also legal for me to then do this:

public class Stranger : Parent<Child>
{
}

如果您编写单元测试，那么值得编写一个查找这种错误模式的类型检查器.

If you write unit tests then it's worth writing a type checker that looks for this mispattern.

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