C# 单例模式实现

概述Double-Checked Locking public class Singleton { private volatile static Singleton _instance = null; private static readonly object _locker = new object(); private S Double-Checked Locking

    public class Singleton    {        private volatile static Singleton _instance = null;        private static Readonly object _locker = new object();        private Singleton() { }        public static Singleton GetInstance()        {            if (_instance == null)            {                lock (_locker)                {                    if (_instance == null)                        _instance = new Singleton();                }            }            return _instance;        }    }

静态初始化

    public sealed class Singleton    {        private static Readonly Singleton _instance = new Singleton();        // 显示静态构造函数，告诉C#编译器不要将Type标记beforefIEldinit(这样就能够使程序在类的字段被引用时才会实例化)        static Singleton() { }        // 防止创建该类的默认实例        private Singleton() { }        public static Singleton Instance        {            get            {                return _instance;            }        }    }

延迟初始化

    public sealed class Singleton    {        private Singleton() { }        public static Singleton Instance { get { return nested._instance; } }        private class nested        {            static nested() { }            internal static Readonly Singleton _instance = new Singleton();        }    }

.Net 4‘s Lazy<T> type 

    public sealed class Singleton    {        private static Readonly Lazy<Singleton> lazy = new Lazy<Singleton>(() => new Singleton());        private Singleton() { }        public static Singleton Instance { get { return lazy.Value; } }    }

以上4中方式都是线程安全的单例实现代码，推荐使用Lazy<T>的方式简单且性能良好。

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