/// <summary>   /// 享元模式Flyweight的实现   /// </summary>   /// <typeparam name="T">Type of object.</typeparam>   /// <example>   /// // C# 中数组是引用类型   /// var pool = new FlyweightObjectPool byte[] (() => new byte[65535]);   /// pool.Allocate(1000);   /// var buffer= pool.Dequeue();   /// // .. do something here ..   /// pool.Enqueue(buffer);   /// </example>   public class FlyweightObjectPool<T> where T : class   {     private readonly Func<T> _factoryMethod;     private readonly ConcurrentQueue<T> _queue = new ConcurrentQueue<T>();     /// <summary>     /// 享元模式Flyweight的实现     /// </summary>     /// <param name="factoryMethod">分配缓存的方法</param>     public FlyweightObjectPool(Func<T> factoryMethod)     {       _factoryMethod = factoryMethod;     }     /// <summary>     /// 分配指定数量的对象     /// </summary>     /// <param name="count">指定的数量</param>     public void Allocate(int count)     {       for (int i = 0; i < count; i++)         _queue.Enqueue(_factoryMethod());     }     /// <summary>     /// 缓存一个对象     /// </summary>     /// <param name="buffer">对象</param>     public void Enqueue(T buffer)     {       _queue.Enqueue(buffer);     }     /// <summary>     /// 获取一个对象     /// </summary>     /// <returns>对象</returns>     public T Dequeue()     {       T buffer;       return !_queue.TryDequeue(out buffer) ? _factoryMethod() : buffer;     }   }

class Program   {     static void Main(string[] args)     {       var pool = new FlyweightObjectPool<byte[]>(() => new byte[65535]);       pool.Allocate(1000);       var buffer = pool.Dequeue();       // .. do something here ..       pool.Enqueue(buffer);     }   }