C#析構器 deconstuctor

概念

類的deconstructor,叫做析構器或者分解式.作用是把類的對象分解成多個變量並返回.

說明

1. 方法名固定為Deconstruct,不能修改
2. 可以被重載
3. 有一個或多個out參數
4. 可以是擴展方法.

舉例

using System;

namespace Test {
    class Program {
        static void Main (string[] args) {
            Person person = new Person ("張三", 23);
            // 寫法1
            int age1;
            string name1;
            (name1, age1) = person;
            Console.WriteLine ($"{name1}今年{age1}歲!");
            // 寫法2
            (string name2, int age2) = person;
            Console.WriteLine ($"{name2}今年{age2}歲!");
            // 寫法3
            int age3;
            string name3;
            person.Deconstruct (out name3, out age3);
            Console.WriteLine ($"{name3}今年{age3}歲!");
            // 寫法4
            person.Deconstruct (out string name4, out int age4);
            Console.WriteLine ($"{name4}今年{age4}歲!");
            // 寫法5
            var (name5, age5) = person;
            Console.WriteLine ($"{name5}今年{age5}歲!");
        }
    }

    class Person {
        public int Age { get; set; }

        private string Name { get; set; }

        public Person () {
            Age = 1;
            Name = "張三";
        }

        public Person (string name, int age) {
            Name = name;
            Age = age;
        }

        public void Deconstruct (out string name, out int age) {
            name = Name;
            age = Age;
        }
    }
}

執行結果