c# 继承的单件

1.概要

目的：为了证明如下问题

• public static T t = default(T); //结果t == null
• public static T t 会为每一个泛型都分配空间

2.代码

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

namespace 继承的单件
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = A.getMy().add(2, 3);
            Console.WriteLine(a);
            int b = B.getMy().cheng(2, 3);
            Console.WriteLine(b);
            Console.ReadKey();
        }
    }
    class Singltan<T> where T : new() {
        public static T t = default(T);
        public static T getMy() {
            if (t == null) {
                t = new T();
            }
            return t;
        }
    }
    class A : Singltan<A> {
        public int add(int a, int b) {
            return a + b;
        }
    }
    class B : Singltan<B> {
        public int cheng(int a, int b) {
            return a * b;
        }
    }
}

3.运行结果