Question

请解释一下“：this（）”是指。我可以使用“base”而不是它。当我将光标移动到“this”时，它会显示另一个构造函数。或者当我用“base”替换它时，它会出现这样的错误：“对象不包含带有1个参数的构造函数”。

class Employee
    {
        private string name;
        private string surname;
        private DateTime birthday;
        private double height;
        private double salary;
        public string Name { get { return name; } set { if (name != value) { name = value; } } }
        public string Surname { get { return surname; } set { if (surname != value) { surname = value; } } }
        public DateTime Birthday { get { return birthday; } set { if (birthday != value) { birthday = value; } } }
        public double Height { get { return height; } set { if (height != value) { height = value; } } }
        public double Salary { get { return salary; } set { if (salary != value) { salary = value; } } }
        public string Full { get { return name + " " + surname; } }
        public Employee() {
            name = "Mina";
            surname = "Babayeva";
            birthday = DateTime.Now.AddYears(-19);
            height=175;
            salary = 3500;
        }   

        public Employee(string name, string surname, DateTime birthday, double height, double salary) : this( name,  surname)
        {
            this.birthday = birthday;
            this.height = height;
            this.salary = salary;
        }
        public Employee(string name) : this()
        {
            this.name = name;
        }
        public Employee(string name, string surname) : this(name)
        {
            this.surname = surname;
        }


        public void Print()
        {
            Console.WriteLine("Name is {0}\nSurname is {1}\nHeight is {2}\nBirthday is {3}\nSalary is {4}", 
                this.Name, this.Surname, this.Height, this.Birthday.ToString("dd/MM/yyyy"), this.Salary);
        }


////////////////////////////////
 Employee a = new Employee();
            Employee b = new Employee("Adil", "Babayev");
             Employee c = new Employee("Zumrud","Babayeva",DateTime.Now.AddYears(-52),167,1000000);
            Employee e = new Employee("Hanna");


            a.Print();
            Console.WriteLine();
            b.Print();
            Console.WriteLine();
            c.Print();
            Console.WriteLine();
            e.Print();
            Console.WriteLine();

Answer 1

在此上下文中，this引用当前类的构造函数。 base指的是基类/继承类的构造函数。所以不，它们不可互换。

更多信息：.NET Balancing Groups

Answer 2

无论何时为类创建构造函数，实际上都是将对象创建为对象的单个副本。 this关键字就是那个实例。

示例Apple类：Orange {}

公共Apple（）：这个（） {} 这个。是对Apple实例的引用。

在类构造函数上调用base时，您正在调用派生类构造函数。公共Apple（）：base（）{}

会返回Orange Class Constructor，而不是Apple！两者之间的巨大差异!!

请查看C＃Constructor Chaining。 MSDN有关于你的任务的很好的例子和文件。
祝你好运我的朋友

亲切的问候。

每个构造函数对“this”指的是什么？

2 个答案: