如何在C#界面中返回Type T？

Question

我有这样的界面:

public interface IUser{
    //some properties here

    T ToDerived(User u);
}

我是接口开发的新手,所以这就是我想要完成的.我会有一个基类

public class User 

不实现上述接口.然后我将有一个派生类

SalesUser : User, IUser
{
    //no properties needed because they exist in the User class

    SalesUser ToDerived(User u)
    {
        //code for converting a base User to a derived SalesUser
    }
}

我想在SalesUser类中编写ToDerived(User u)的函数,但是在界面中,我不知道如何定义这个,因为我现在在界面中的ToDerived方法声明没有编译.

我希望这是有道理的.

Answer 1

public interface IUser<T> where T : User
{
    //some properties here

    T ToDerived(User u);
}

SalesUser : User, IUser<SalesUser>
{
    //no properties needed because they exist in the User class

    SalesUser ToDerived(User u)
    {
        //code for converting a base User to a derived SalesUser
    }
}

不确定这是你想要的,但我在接口上添加了泛型类型约束,以确保泛型类型是User或继承它.