Singleton

最新推荐文章于 2024-10-15 03:48:19 发布

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最新推荐文章于 2024-10-15 03:48:19 发布

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原文链接：http://www.cnblogs.com/archmaster/archive/2005/03/15/118899.html

博客展示了C#中五种单例模式的实现代码。包括简单懒汉式、加锁懒汉式、双重检查锁定、饿汉式和静态内部类实现方式，每种方式都有对应的代码示例，可用于在C#编程中实现单例模式。

using System;

public sealed class Singleton1
{
static Singleton1 instance;
Singleton1(){}
public static Singleton1 Instance
{
  get{
  if (instance == null)
  instance = new Singleton1();
  return instance;
}
}
}

public sealed class Singleton2
{
static Singleton2 instance;
static readonly object padlock = new object();

public static Singleton2 Instance
{
  get
  {
   lock (padlock)
   {
    if (instance == null)
    instance = new Singleton2();
   }
   return instance;
  }
}
}

public sealed class Singleton3
{
static Singleton3 instance;
static readonly object padlock = new object();
public static Singleton3 Instance
{
  get{
  if (instance == null)
  lock(padlock){
  if (instance == null){
  instance = new Singleton3();
}
}
       return instance;
}
}
}

public sealed class Singleton4
{
static readonly Singleton4 instance = new Singleton4();
static Singleton4(){}
Singleton4(){}

public static Singleton4 Instance
{
get{
return instance;
}
}
}

public sealed class Singleton5
{
Singleton5(){}

public static Singleton5 Instance
{
get{
return Nested.instance;
}
}

class Nested{
static Nested(){}
internal static readonly Singleton5 instance = new Singleton5();
}
}