重构指南 - 引入参数对象（Introduce Parameter Object）

 public class Registration
    {
        public void Create(decimal amount, Student student, IEnumerable<Course> courses, decimal credits)
        {
            // do work
        }
    }

public class RegistrationContext
    {
        public decimal Amount { get; set; }
        public Student Student { get; set; }
        public IEnumerable<Course> Courses { get; set; }
        public decimal Credits { get; set; }
    }

    public class Registration
    {
        public void Create(RegistrationContext registrationContext)
        {
            // do work
        }
    }