public sealed class ContainerStyleMessageSpy : IMessageSpy
    {
        #region SpyList
        private IList<IMessageSpy> spyList = new List<IMessageSpy>();
        public IList<IMessageSpy> SpyList
        {
            set
            {
                spyList = value ?? new List<IMessageSpy>();
            }
        }
        #endregion

#region IMessageSpy 成员

#region Enabled
        private bool enabled = true;
        public bool Enabled
        {
            set { this.enabled = value; }
            get { return this.enabled; }
        }
        #endregion

#region SpyMessageReceived
        public bool SpyMessageReceived(IMessage msg)
        {
            if (!this.enabled)
            {
                return true;
            }

foreach (IMessageSpy spy in this.spyList)
            {
                bool keepOn = spy.SpyMessageReceived(msg);
                if (!keepOn)
                {
                    return false;
                }
            }

return true;
        }
        #endregion

#region SpyMessageToBeSent
        public bool SpyMessageToBeSent(IMessage msg)
        {
            if (!this.enabled)
            {
                return true;
            }

foreach (IMessageSpy spy in this.spyList)
            {
                bool keepOn = spy.SpyMessageToBeSent(msg);
                if (!keepOn)
                {
                    return false;
                }
            }

return true;
        }
        #endregion

#endregion
    }