Question

您好我正在做一个c＃课程，无法理解构造函数调用主题。我得到错误并一直在看视频，但我无法让它工作，我不断收到错误：“E2.Student.Student（string，string）'不能自称”

当我尝试创建一个带有2个参数的构造函数时，我得到了这个错误，因为我理解这个带有我试图创建的2个参数的构造函数是否继承了它下面的4个参数的构造函数？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace E2
{
    class Student
    {
        string fullName;
        string course;
        string email;
        string phonenr;
        enumUniversity university;
        enumSubject subject;

        public Student()
        {
        }

        public Student(string fullname,string course) : this (fullname,course) =======>THIS IS WHERE I GET THE ERROR
        {
        }

        public Student(string fullname, string course, string email, string phonenr, enumUniversity university, enumSubject subject)
        {
            this.fullName = fullname;
            this.course = course;
            this.email = email;
            this.phonenr = phonenr;
            this.university = university;
            this.subject = subject;
        }

        public void PrintInfo()
        {
            Console.WriteLine("Name: {0} Course {1} email {2} phonenr {3} univ {4} subject {5}", fullName, course, email, phonenr, university, subject);
        }
    }
}

我的学习内容示例：

public Dog(string name)
: this(name, 1) // Constructor call
{
}
// Two parameters
public Dog(string name, int age)
: this(name, age, 0.3) // Constructor call
{
}
// Three parameters
public Dog(string name, int age, double length)
: this(name, age, length, new Collar()) // Constructor call
{
}
// Four parameters
public Dog(string name, int age, double length, Collar collar)
{
this.name = name;
this.age = age;
this.length = length;
this.collar = collar;
}

Answer 1

让构造函数使用ctor链接调用自身。这种情况是不可能的，因为它会导致世界变成某种无限循环：）

执行此操作的方法是，您需要使用所有其他参数调用构造函数，例如：

        public Student() : this(string.Empty, string.Empty)
        {
        }

        public Student(string fullname,string course) 
            : this (fullname,course, string.Empty, string.Empty, default(enumUniversity), default(enumSubject))
        {
        }

        public Student(string fullname, string course, string email, string phonenr, enumUniversity university, enumSubject subject)
        {
            this.fullName = fullname;
            this.course = course;
            this.email = email;
            this.phonenr = phonenr;
            this.university = university;
            this.subject = subject;
        }

构造函数调用c＃class

1 个答案: