C#经典的线程安全的单例模式（独身模式）实现代码

publicsealedclassSingleton{Singleton(){}publicstaticSingletonInstance{get{returnNested.instance;}}classNested{// Explicit static constructor to tell C# compiler// not to mark type as beforefieldinitstaticNested(){}internalstaticreadonlySingleton instance =newSingleton();}}

使用内嵌类，实现延迟加载；指定为readonly保证线程安全。