singleton class

最新推荐文章于 2021-08-29 01:11:48 发布

原创最新推荐文章于 2021-08-29 01:11:48 发布 · 733 阅读

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本文详细介绍了单例模式的实现及其在多线程环境下的安全优化，包括私有静态对象、空构造函数、公共静态属性及多线程同步机制。

public class Singleton
{
// Private static object can access only inside the Emp class.
private static Singleton instance;

// Private empty constructor to restrict end use to deny creating the object.
private Singleton()
{
}

// A public property to access outside of the class to create an object.
public static Singleton Instance
{
get
{
if (instance == null)
{
instance = new Singleton();
}
return instance;
}
}

}

public sealed class MultiThreadSingleton
{
private static volatile MultiThreadSingleton instance;
private static object syncRoot = new Object();

private MultiThreadSingleton()
{
}

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

}

//static only

public sealed class SealedSingleton
{
private static readonly SealedSingleton instance = new SealedSingleton();

private SealedSingleton()
{
}

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