微软官方Singleton双锁算法

Link: http://msdn.microsoft.com/en-us/library/ms998558.aspx[code] using System; public sealed class Singleton { private static volatile Singleton instance; private static object syncRoot = new Object(); private Singleton() {} public static Singleton Instance { get { if (instance == null) { lock (syncRoot) { if (instance == null) instance = new Singleton(); } } return instance; } } }