How do I make a self reference in Entity Framework Code First?

我怎么在实体框架代码，先做个自我参考？

youdao

This is a reference to an undeclared entity, '{ 0 } '.

这是对未声明实体“ {0}”的引用。

youdao

This is a reference to an undeclared entity, '{ 0 } '.

这是对未声明实体“ {0}”的引用。

youdao