为具有状态的给定文章类设计系统

Question

有以下问题。文章在由几个不同的角色发布之前会经历几个阶段。

Writer -> writes
Approver -> approves
Admin -> Publishes

设计一个允许最大扩展性的程序：这就是我所拥有的。有人可以让我知道这是否是正确的方法吗？有更好的吗？

public interface IRole
{
    IRole Write();
    IRole Approve();
    IRole Publish();
}
internal class Writer : IRole
{
    public IRole Write()
    {
        return new Approver(); // next needs approval
    }
    public IRole Approve()
    {
        return this;
    }
    public IRole Publish()
    {
        return this;
    }
}
internal class Approver : IRole
{
    public IRole Write()
    {
        return new Writer();
    }
    public IRole Approve()
    {
        // publish
        return new Admin();
    }
    public IRole Publish()
    {
        return this;
    }
}

internal class Admin : IRole
{
    public IRole Write()
    {
        return new Writer();
    }
    public IRole Approve()
    {
        return new Approver();
    }
    public IRole Publish()
    {
        return this;
    }
}
internal class Article
{
    public Article()
    {
        role = new Writer();
    }
    private IRole role { get; set; }
    public void Write()
    {
        role = role.Write();
    }
    public void Approve()
    {
        role = role.Approve();
    }
    public void Publish()
    {
        role = role.Publish();
    }
}
    private static void Main(string[] args)
    {
        var article = new Article();
        article.Approve(); // can't do - write first
        article.Write();
        article.Publish(); // can't do
        article.Approve(); // can
        article.Write(); // can go back
        article.Approve(); // can
        article.Publish();
    }

Answer 1

您正在寻找的内容称为">责任链"。它是一种设计模式，允许操作一个接一个地链接。您的用例将完全符合此模式。https://www.codeproject.com/Articles/594974/Chain-of-Responsibility-Pattern