[Design Pattern] Generic Singleton Pattern with C#

using System;using System.Collections.Generic;using System.Text;using System.Reflection;namespace DesignPattern{ public class TSingleton<T> where T : class { static object SyncRoot = new object(); static T instance; public static readonly Type[] EmptyTypes = new Type[0]; public static T Instance { get { if (instance == null) { lock (SyncRoot) { if (instance == null) { ConstructorInfo ci = typeof(T).GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, EmptyTypes, null); if (ci == null) { throw new InvalidOperationException("class must contain a private constructor"); } instance = (T)ci.Invoke(null); //instance = Activator.CreateInstance(typeof(T)) as T; } } } return instance; } } }}

public static readonly Type[] EmptyTypes = new Type[0];

这一行代码是很重要的！

在.NETCF中，Type.EmptyType并没有被声明,但在.NET中却有

而在我的项目中，这个单例的实践却是必须利用.NETCF的dll项目来实践出.NETCF与.NET通用的dll

因此有此行声明