C# - 在子类中指定超类的类型参数？

Question

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>
{
}

How can I do it?

Answer 1

This works fine:

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

public class Child : Parent<Child>
{
}

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>
{
}

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