Using C# 2.0 Generics to achieve a reusable Singleton pattern

一般代码：

    public sealed class Singleton
    {
        Singleton()
        {
        }

        public static Singleton Instance
        {
            get
            {
                return SingletonCreator.instance;
            }
        }
        
        class SingletonCreator
        {
            // Explicit static constructor to tell C# compiler
            // not to mark type as beforefieldinit
            static Nested()
            {
            }

            internal static readonly Singleton instance = new Singleton();
        }
    }

用模板实现：

    public class SingletonProvider <T> where T:new()
    {
        SingletonProvider() {}

        public static T Instance
        {
            get { return SingletonCreator.instance; }
        }

        class SingletonCreator
        {
            static SingletonCreator() { }

            internal static readonly T instance = new T();
        }
    }

用例：

    public class TestClass
    {
        private string _createdTimestamp;

        public TestClass ()
        {
            _createdTimestamp = DateTime.Now.ToString();
        }

        public void Write()
        {
            Debug.WriteLine(_createdTimestamp);
        }
    }

使用：

SingletonProvider<TestClass>.Instance.Write();

原地址：