(轉)設計模式_Singleton單例模式

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　　靜態初始化

public sealed class Singleton {    private static readonly Singleton instance = new Singleton();    private Singleton(){}    public static Singleton Instance    {       get        {          return instance;        }    } } 

Double-Check Locking  兩次檢查鎖定

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;       }    } } 
消極式載入

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

延伸閱讀：https://msdn.microsoft.com/zh-CN/Library/ms998558.aspx
         http://www.cnblogs.com/rush/archive/2011/10/30/2229565.html

(轉)設計模式_Singleton單例模式