using System;
namespace 设计模式_单例模式
{
class Program
{
///
/// 单例模式（不适应与多线程）
///
public class Singleton
{
private static Singleton insrence;
private Singleton() { }
public static Singleton Instence
{
get
{
if (insrence==null)
{
insrence = new Singleton();
}
return insrence;
}
}
}
/// <summary>
/// 适用于多线程
/// </summary>
public class SingletonTrs
{
private static volatile SingletonTrs instence;//volatile:保证代码编译后严格按照此执行顺序
private static object lockHelper = new object();
private SingletonTrs() { }
public static SingletonTrs Instence
{
get
{
//双重检查-多线程访问时保证只生成一个单例
if (instence == null)
{
lock (lockHelper)
{
if (instence == null)
{
instence = new SingletonTrs();
}
}
}
return instence;
}
}
}
/// <summary>
/// 适用于多线程
/// </summary>
class Singleton3
{
public static readonly Singleton3 Instence = new Singleton3();//内联初始化
private Singleton3() { }
}
/// <summary>
/// 同上
/// </summary>
class Singletog33
{
public static readonly Singletog33 Instence;
static Singletog33()//放在静态构造器，先于静态属性执行(只会被一个线程执行) 缺点：无法传递参数
{
Instence = new Singletog33();
}
private Singletog33() { }
}
static void Main(string[] args)
{
}
}
}