标签：help 线程安全 obj 单例 div pre new 单例模式 sharp
第一种，懒汉模式，没考虑线程安全
public class Singleton
{
private static Singleton _instance = null;
private Singleton(){}
public static Singleton CreateInstance()
{
if(_instance == null)
{
_instance = new Singleton();
}
return _instance;
}
}
第二种，经典模式
public class Singleton
{
private volatile static Singleton _instance = null;
private static readonly object lockHelper = new object();
private Singleton(){}
public static Singleton CreateInstance()
{
if(_instance == null)
{
lock(lockHelper)
{
if(_instance == null)
_instance = new Singleton();
}
}
return _instance;
}
}
第三种，饿汉模式
public class Singleton
{
private Singleton(){}
public static readonly Singleton instance = new Singleton();
}
标签：help 线程安全 obj 单例 div pre new 单例模式 sharp
原文地址：http://www.cnblogs.com/chenh/p/7894606.html
