C#单例

单例模式:

步骤:

1.定义静态私有对象

2.构造函数私有化

3.定义一个静态的,返回值为该类型的方法,一般以Getinstance/getInit为方法名称

单例模式有懒汉和饿汉,最好使用饿汉

1.饿汉式---先实例化

1public class Singleton
2    {
3        private static Singleton  _singleton = new Singleton();//1
4        private Singleton()  //2
5        {
6        }
7        public static Singleton GetInstance()  //3
8        {
9
10            return _singleton;
11        }
12
13
14    }

2.懒汉式---后实例化

using System;

namespace 单例懒汉
{

public class Singleton

1    {
2        private static Singleton _singleton;   //1
3        private Singleton()   // 2
4        {
5
6        }
7        public static Singleton GetInstance()  3
8        {
9            if (_singleton == null)
10            {
11                _singleton = new Singleton();
12            }
13            return _singleton;
14        }
15   }}