c# 單例模式(Single)

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 public class Singleton    {        private static Singleton _instance;        private static readonly object syn = new object();        private Singleton() //建構函式設定private，不能被new，單例模式        {        }        public static Singleton CreateInstance()        {            if (_instance == null)            {                lock (syn)  //加鎖防止多線程                {                    if (_instance == null)                    {                        _instance = new Singleton();                    }                }            }            return _instance;        }    }

 

c# 單例模式(Single)