Lind.DDD.Domain领域模型介绍

　　 /// <summary>
    /// 实体类标示接口
    /// </summary>
    public interface IEntity
    {

    }

    /// <summary>
    /// 领域模型，实体模型基类，它可能有多种持久化方式，如DB,File,Redis,Mongodb,XML等
    /// Lind.DDD框架的领域模型与数据库实体合二为一
    /// </summary>
    [PropertyChangedAttribute]
    public abstract class EntityBase :
        // ContextBoundObject,//属性变化跟踪，这个可以在具体的实体上添加，需要记录它的set变化，就添加这个特性
        IEntity,
        INotifyPropertyChanged
    {
        #region Contructors
        /// <summary>
        /// 实体初始化
        /// </summary>
        public EntityBase()
            : this(Status.Normal, DateTime.Now, DateTime.Now)
        { }
        /// <summary>
        /// 带参数的初始化
        /// </summary>
        /// <param name="status">状态</param>
        /// <param name="updateDateTime">更新日期</param>
        /// <param name="createDateTime">插入日期</param>
        public EntityBase(Status status, DateTime updateDateTime, DateTime createDateTime)
        {
            this.DataStatus = Status.Normal;
            this.DataUpdateDateTime = DateTime.Now;
            this.DataCreateDateTime = DateTime.Now;
            this.PropertyChanged += EntityBase_PropertyChanged;
        }
        #endregion

        #region Properties
        /// <summary>
        /// 建立时间
        /// </summary>
        [XmlIgnore, DataMember(Order = 3), XmlElement(Order = 3), DisplayName("建立时间"), Required]
        public DateTime DataCreateDateTime { get; set; }
        /// <summary>
        /// 更新时间
        /// </summary>
        [XmlIgnore, DataMember(Order = 2), XmlElement(Order = 2), DisplayName("更新时间"), Required]
        public DateTime DataUpdateDateTime { get; set; }
        /// <summary>
        /// 实体状态
        /// </summary>
        [XmlIgnore, DataMember(Order = 1), XmlElement(Order = 1), DisplayName("状态"), Required]
        public Status DataStatus { get; set; }
        #endregion

        #region Methods
        /// <summary>
        /// 拿到实体验证的结果列表
        /// 结果为null或者Enumerable.Count()==0表达验证成功
        /// </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);
                        }
                }
            }

        }
        #endregion

        #region PropertyChangedEventHandler Events
        /// <summary>
        /// 属性值变更事件，外部可以直接订阅它
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;
        /// <summary>
        /// 事件实例
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void EntityBase_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            Console.WriteLine("基类EntityBase属性:{0},值:{1}", e.PropertyName, sender.GetType().GetProperty(e.PropertyName).GetValue(sender));
        }
        /// <summary>
        /// 触发事件,写在每个属性的set块中CallerMemberName特性表示当前块的属性名
        /// </summary>
        /// <param name="propertyName"></param>
        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }

        #endregion

    }

　　 /// <summary>
    /// 主键为int类型的实体基类
    /// </summary>
    public abstract class Entity : EntityBase
    {
        /// <summary>
        /// 标识列
        /// </summary>
        [DisplayName("编号"), Column("ID"), Required]
        public int Id { get; set; }
    }

　　/// <summary>
    /// mongodb,xml,redis实体基类
    /// 主键类型为string
    /// </summary>
    public abstract class NoSqlEntity : EntityBase
    {
        public NoSqlEntity()
        {
            this.Id = ObjectId.GenerateNewId().ToString();
        }
        /// <summary>
        /// 标识列
        /// </summary>
        [BsonId]
        [BsonRepresentation(BsonType.ObjectId)]
        [DataMember(Order = 0), XmlElement(Order = 0), DisplayName("编号"), Column("ID"), Required]
        public string Id { get; set; }

        /// <summary>
        /// 返回mongodb实体的键值对
        /// </summary>
        public IEnumerable<KeyValuePair<string, object>> GetProperyiesDictionary()
        {
            var properties = this.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance)
                   .Where(i => i.Name != "Id")
                   .ToArray();

            foreach (var i in properties)
                yield return new KeyValuePair<string, object>(i.Name, i.GetValue(this));

        }
    }