关于具体需求，请看前面的博文：DDD领域驱动设计实践篇之如何提取模型，下面是具体的实体、聚合、值对象的代码，不想多说什么是实体、聚合等概念，相信理论的东西大家已经知晓了。本人对DDD表示好奇，没有在真正项目实践过，甚至也没有看过真正的DDD实践的项目源码，处于极度纠结状态，甚至无法自拔，所以告诫DDD爱好者们，如果要在项目里面实践DDD，除非你对实体建模和领域职责非常了解（很多时候会纠结一些逻辑放哪里好，属于设计问题）以及你的团队水平都比较高认同DDD，否则请慎重。。。勿喷！
代码在后，请先看DEMO结果图
1、聚合的基类，注意，几乎属性都是拼音首字母命名，勿喷哈，不要跑题！
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using DDD.Infrastructure;
using DDD.Infrastructure.Domain;namespace DDD.Domain
{/// /// 项目基类/// public abstract class ProjectBase : EntityBase, IAggregateRoot{protected ProjectBase(){this.ND = DateTime.Now.Year;this.CJSJ = DateTime.Now;this.WH = new DocumentNumber();}/// /// 安排批次/// public int APPC { get; set; }/// /// 项目名称/// public string XMMC { get; set; }/// /// 项目编号/// public string XMBH { get; internal set; }/// /// 年度/// public int ND { get; set; }/// /// 文号/// public DocumentNumber WH { get; set; }/// /// 创建时间/// public DateTime CJSJ { get; set; }/// /// 下发行政区名称/// public string XFXZQMC { get; set; }/// /// 下发行政区代码/// public string XFXZQDM { get; set; }/// /// 行政区名称/// public string XZQMC { get; set; }/// /// 行政区代码/// public string XZQDM { get; set; }/// /// 备注/// public string BZ { get; set; }/// /// 指标级别/// public IndicatorGrade ZBJB { get; set; }/// /// 附件id/// public decimal ATTACHID { get; set; }/// /// 项目状态/// public ProjectStauts Status { get; set; }/// /// 业务代码/// protected abstract string BussinessCode { get; }/// /// 登记/// /// public virtual void Register(){this.XMBH = this.BussinessCode + SeqGeneratr.Generate();}/// /// 是否可以更新或者删除/// /// 2、聚合1
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using DDD.Infrastructure;
using DDD.Infrastructure.Domain;namespace DDD.Domain.Indicator
{/// /// 计划指标/// public class PlanIndicator : ProjectBase{public PlanIndicator(){IndicatorArea = new IndicatorArea();}protected override string BussinessCode{get { return "103101"; }}/// /// 指标面积/// public IndicatorArea IndicatorArea{get;set;}public override IEnumerable Validate(){if (this.IndicatorArea.GD > this.IndicatorArea.NYD){yield return new BusinessRule("IndicatorArea.GD", "耕地面积不能大于农用地面积");}}public override void Register(){if (this.ZBJB == IndicatorGrade.Country){this.Send();}base.Register();}}
}
3、聚合2
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using DDD.Infrastructure;
using DDD.Infrastructure.Domain;namespace DDD.Domain.Arrange
{/// /// 计划安排/// public class PlanArrange : ProjectBase{public PlanArrange(){JHSY = new IndicatorArea();SJSY = new IndicatorArea();}protected override string BussinessCode{get { return "103102"; }}/// /// 计划使用面积/// public IndicatorArea JHSY{get;set;}/// /// 实际使用面积/// public IndicatorArea SJSY{get;set;}/// /// 剩余面积/// public IndicatorArea SY{get{return JHSY - SJSY;}}/// /// 用地类别/// public string XMYDLB { get; set; }public override IEnumerable Validate(){if (this.JHSY.GD > this.JHSY.NYD){yield return new BusinessRule("JHSY.GD", "计划使用中，耕地面积不能大于农用地面积");}if (this.SJSY.GD > this.SJSY.NYD){yield return new BusinessRule("SJSY.GD", "实际使用中，耕地面积不能大于农用地面积");}if (string.IsNullOrEmpty(this.XMYDLB)){yield return new BusinessRule("XMYDLB", "项目用地类别不允许为空");}}}
}
4、值对象1
using System;
using DDD.Infrastructure.Domain;namespace DDD.Domain
{/// /// 文号/// public class DocumentNumber : ValueObject, ICloneable{public static readonly string LeftYearChar = "〔";public static readonly string RightYearChar = "〕";public DocumentNumber() {}public DocumentNumber(string wh) {try{this.Code = wh.Substring(0, wh.IndexOf(LeftYearChar));this.Year = wh.Substring(wh.IndexOf(LeftYearChar), wh.IndexOf(RightYearChar) - this.Code.Length + 1);this.Order = wh.Replace(this.Code + this.Year, "");this.Year = this.Year.Replace(LeftYearChar, "").Replace(RightYearChar, "");}catch(Exception ex){throw new InvalidCastException("文号格式不正确", ex);}}/// /// 发文机关代字/// public string Code { get; set; }/// /// 年份/// public string Year { get; set; }private string order;/// /// 顺序号/// public string Order{get{if (!string.IsNullOrEmpty(order) && !order.Contains("号")){order += "号";}return order;}set{order = value;}}public override string ToString(){if (string.IsNullOrEmpty(Code) && string.IsNullOrEmpty(Year) && string.IsNullOrEmpty(order)){return string.Empty;}return this.Code + LeftYearChar + Year + RightYearChar + Order;}public static implicit operator DocumentNumber(string wh){return new DocumentNumber(wh);}public object Clone(){return this.MemberwiseClone();}}
} 5、值对象2
using DDD.Infrastructure;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using DDD.Infrastructure.Domain;namespace DDD.Domain
{/// /// 指标面积/// public class IndicatorArea : ValueObject{/// /// 新增建设用地/// public decimal XZJSYD{get{return NYD + WLYD;}}/// /// 农用地/// public decimal NYD { get; set; }/// /// 耕地/// public decimal GD { get; set; }/// /// 未利用地/// public decimal WLYD { get; set; }/// /// 将公顷转换成亩/// /// /// 重载加法运算符/// /// /// /// /// 重载减法运算符/// /// /// /// query){return new IndicatorArea{GD = query.Sum(t => t.GD),NYD = query.Sum(t => t.NYD),WLYD = query.Sum(t => t.WLYD),};}}
}
6、枚举
using System.ComponentModel;namespace DDD.Domain
{/// /// 指标级别/// public enum IndicatorGrade{/// /// 国家/// [Description("国家")]Country,/// /// 省级/// [Description("省级")]Province,/// /// 市级/// [Description("市级")]City,/// /// 县级/// [Description("县级")]County,}
}
using System.ComponentModel;namespace DDD.Domain
{/// /// 项目状态/// public enum ProjectStauts{/// /// 默认状态，已登记/// Default,/// /// 已下发/// Sent,}
}