07# Singleton 패턴(thread safe) Creational Patterns

static void Main(string[] args) {     //BuilderExample();     //FactoryExample();     //FactoryMethodExample();     //FactoryMethodExample2();     //ProtoTypeExample();       SingletonExample();       //Console.WriteLine("Hello World!");     Console.ReadKey(); }   static void SingletonExample() {     LazySingleton<SingletonData>.IsValueCreated();     Console.WriteLine("Name : {0} Age : {1}", LazySingleton<SingletonData>.Instance.Name, LazySingleton<SingletonData>.Instance.Age);     LazySingleton<SingletonData>.IsValueCreated();       LazySingleton<SingletonData2>.IsValueCreated();     Console.WriteLine("Name : {0} Age : {1}", LazySingleton<SingletonData2>.Instance.Name, LazySingleton<SingletonData2>.Instance.Age);     LazySingleton<SingletonData2>.IsValueCreated(); }   main.cs

 

using System; using System.Collections.Generic; using System.Text;   namespace DesignPatterns.Patterns.Singleton {     public class SingletonData     {         public string Name { get; set; }         public Int32 Age { get; set; }           public SingletonData()         {             Name = "Na";             Age = 34;         }     } }   SingletonData.cs

 

using System; using System.Collections.Generic; using System.Text;   namespace DesignPatterns.Patterns.Singleton {     public class SingletonData2     {         public string Name { get; set; }         public Int32 Age { get; set; }           public SingletonData2()         {             Name = "Na2";             Age = 35;         }     } }   SingletonData2.cs

 

using System; using System.Collections.Generic; using System.Text;   namespace DesignPatterns.Patterns.Singleton {     public class LazySingleton<T> where T : new()     {         //초기화 모드 Thread publicationOnly         private static readonly Lazy<T> instance = new Lazy<T>(() => new T(), System.Threading.LazyThreadSafetyMode.PublicationOnly);         //일반 모드 Thread publicationOnly         private static readonly Lazy<SingletonData> instance2 = new Lazy<SingletonData>(System.Threading.LazyThreadSafetyMode.PublicationOnly);         public static T Instance { get { return instance.Value; } }         private LazySingleton() { }           public static void IsValueCreated()         {             Console.WriteLine("IsValueCreated : {0}", instance.IsValueCreated);         }     } }   LazySingleton.cs