// 摘(zhai)要:
    //     向客戶端(duan)發出某(mou)一(yi)屬性(xing)值已(yi)更改(gai)的通知。
    public interface INotifyPropertyChanged
    {
        // 摘要:
        //     在更改屬性值時發生。
        event PropertyChangedEventHandler PropertyChanged;
    }

    /// <summary>
    /// 領域模(mo)型，實(shi)體模(mo)型基類(lei)，它可(ke)能有多種持(chi)久化方(fang)式(shi)，如DB,File,Redis,Mongodb,XML等
    /// Lind.DDD框架的領域(yu)模型與(yu)數(shu)據庫(ku)實體合二為一
    /// </summary>
    [PropertyChangedAttribute]
    public abstract class EntityBase : ContextBoundObject, IEntity, INotifyPropertyChanged
    {
        /// <summary>
        /// 實體初始(shi)化
        /// </summary>
        public EntityBase()
        {
            this.Status = Status.Normal;
            this.UpdateDateTime = DateTime.Now;
            this.CreateDateTime = DateTime.Now;
            this.PropertyChanged += EntityBase_PropertyChanged;
        }

        /// <summary>
        /// 建立時間
        /// </summary>
        [XmlIgnore, DataMember(Order = 3), XmlElement(Order = 3), DisplayName("建(jian)立時間(jian)"), Column("CreateTime"), Required]
        public DateTime CreateDateTime { get; set; }
        /// <summary>
        /// 更新時間
        /// </summary>
        [XmlIgnore, DataMember(Order = 2), XmlElement(Order = 2), DisplayName("更新時間"), Column("UpdateTime"), Required]
        public DateTime UpdateDateTime { get; set; }
        /// <summary>
        /// 實體狀態
        /// </summary>
        [XmlIgnore, DataMember(Order = 1), XmlElement(Order = 1), DisplayName("狀態"), Required]
        public Status Status { get; set; }

        /// <summary>
        /// 拿到(dao)實體驗(yan)證(zheng)的結(jie)果列表
        /// 結果為null或(huo)者Enumerable.Count()==0表達驗證成功
        /// </summary>
        /// <returns></returns>
        public IEnumerable<RuleViolation> GetRuleViolations()
        {
            var properties = this.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance).ToArray();

            foreach (var i in properties)
            {
                var attr = i.GetCustomAttributes();
                foreach (var a in attr)
                {
                    var val = (a as ValidationAttribute);
                    if (val != null)
                        if (!val.IsValid(i.GetValue(this)))
                        {
                            yield return new RuleViolation(val.ErrorMessage, i.Name);
                        }
                }
            }

        }

        #region PropertyChangedEventHandler Events
        /// <summary>
        /// 屬性值變更(geng)事件(jian)
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;
        /// <summary>
        /// 事件實(shi)例
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void EntityBase_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            Console.WriteLine("屬性:{0},值:{1}", e.PropertyName, sender.GetType().GetProperty(e.PropertyName).GetValue(sender));
        }
        /// <summary>
        /// 觸發事件,寫在每個屬(shu)性(xing)(xing)的set塊中(zhong)CallerMemberName特性(xing)(xing)表示當前(qian)塊的屬(shu)性(xing)(xing)名(ming)
        /// </summary>
        /// <param name="propertyName"></param>
        public void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }

        #endregion

    }

    /// <summary>
    /// 類中方法攔截的特性
    /// </summary>
    public class PropertyChangedAttribute : ProxyAttribute
    {
        public override MarshalByRefObject CreateInstance(Type serverType)
        {
            PropertyChangedProxy realProxy = new PropertyChangedProxy(serverType);
            return realProxy.GetTransparentProxy() as MarshalByRefObject;
        }
    }

    /// <summary>
    /// 屬性(xing)變更(geng)攔截器
    /// </summary>
    public class PropertyChangedProxy : RealProxy
    {
        Type serverType;
        public PropertyChangedProxy(Type serverType)
            : base(serverType)
        {
            this.serverType = serverType;
        }
        public override IMessage Invoke(IMessage msg)
        {
            //構造方法(fa)
            if (msg is IConstructionCallMessage)
            {
                IConstructionCallMessage constructCallMsg = msg as IConstructionCallMessage;
                IConstructionReturnMessage constructionReturnMessage = this.InitializeServerObject((IConstructionCallMessage)msg);
                RealProxy.SetStubData(this, constructionReturnMessage.ReturnValue);
                return constructionReturnMessage;
            }
            //其它方法(fa)（屬性(xing)也是方法(fa),它會(hui)被翻譯成set_property,get_property,類(lei)似(si)于java里的屬性(xing)封(feng)裝(zhuang)）
            else if (msg is IMethodCallMessage)
            {

                IMethodCallMessage callMsg = msg as IMethodCallMessage;
                object[] args = callMsg.Args;
                IMessage message;
                try
                {

                    if (callMsg.MethodName.StartsWith("set_") && args.Length == 1)
                    {
                        string propertyName = Regex.Split(callMsg.MethodName, "set_")[1];
                        //這里檢測到是set方法，然后應怎么調用對象(xiang)的其它(ta)方法呢(ni)？
                        var method = this.serverType.GetMethod("OnPropertyChanged");
                        if (method != null)
                        {
                            var obj = GetUnwrappedServer();
                            obj.GetType().GetProperty(propertyName).SetValue(obj, args.FirstOrDefault());
                            method.Invoke(obj, new object[] { propertyName });//這塊對象為空了(le)
                        }

                    }

                    object o = callMsg.MethodBase.Invoke(GetUnwrappedServer(), args);
                    message = new ReturnMessage(o, args, args.Length, callMsg.LogicalCallContext, callMsg);
                }

                catch (Exception e)
                {

                    message = new ReturnMessage(e, callMsg);

                }

                return message;

            }

            return msg;

        }
    }

     User u1 = new User();
     u1.UserName = "OK";
     u1.Age = 100;