c# - C# 泛型类型中的 "Current Type"占位符？

Question

基本上，我想做的是:

public class MySpecialCollection<T>
    where T : ISomething { ... }

public interface ISomething
{
    public ISomething NextElement { get; }
    public ISomething PreviousElement { get; }
}

public class XSomething : ISomething { ... }

MySpecialCollection<XSomething> coll;
XSomething element = coll.GetElementByShoeSize(39);
XSomething nextElement = element.NextElement; // <-- line of interest

... 无需将 nextElement 转换为 XSomething。有任何想法吗？我会想要某种......

public interface ISomething
{
    public SameType NextElement { get; }
    public SameType PreviousElement { get; }
}

提前致谢!

Answer 1

使界面通用:

public class MySpecialCollection<T> where T : ISomething<T> {
  ...
}

public interface ISomething<T> {
  T NextElement { get; }
  T PreviousElement { get; }
}

public class XSomething : ISomething<XSomething> {
  ...
}