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
{/// <summary>/// 项目基类/// </summary>public abstract class ProjectBase : EntityBase, IAggregateRoot{protected ProjectBase(){this.ND = DateTime.Now.Year;this.CJSJ = DateTime.Now;this.WH = new DocumentNumber();}/// <summary>/// 安排批次/// </summary>public int APPC { get; set; }/// <summary>/// 项目名称/// </summary>public string XMMC { get; set; }/// <summary>/// 项目编号/// </summary>public string XMBH { get; internal set; }/// <summary>/// 年度/// </summary>public int ND { get; set; }/// <summary>/// 文号/// </summary>public DocumentNumber WH { get; set; }/// <summary>/// 创建时间/// </summary>public DateTime CJSJ { get; set; }/// <summary>/// 下发行政区名称/// </summary>public string XFXZQMC { get; set; }/// <summary>/// 下发行政区代码/// </summary>public string XFXZQDM { get; set; }/// <summary>/// 行政区名称/// </summary>public string XZQMC { get; set; }/// <summary>/// 行政区代码/// </summary>public string XZQDM { get; set; }/// <summary>/// 备注/// </summary>public string BZ { get; set; }/// <summary>/// 指标级别/// </summary>public IndicatorGrade ZBJB { get; set; }/// <summary>/// 附件id/// </summary>public decimal ATTACHID { get; set; }/// <summary>/// 项目状态/// </summary>public ProjectStauts Status { get; set; }/// <summary>/// 业务代码/// </summary>protected abstract string BussinessCode { get; }/// <summary>/// 登记/// </summary>/// <param name="seq"></param>public virtual void Register(){this.XMBH = this.BussinessCode + SeqGeneratr.Generate();}/// <summary>/// 是否可以更新或者删除/// </summary>/// <returns></returns>public virtual bool CanUpdate(){return this.ZBJB == IndicatorGrade.Country || this.XFXZQDM == this.XZQDM || this.Status == ProjectStauts.Default;}public void Send(){this.Status = ProjectStauts.Sent;}}
}
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
{/// <summary>/// 计划指标/// </summary>public class PlanIndicator : ProjectBase{public PlanIndicator(){IndicatorArea = new IndicatorArea();}protected override string BussinessCode{get { return "103101"; }}/// <summary>/// 指标面积/// </summary>public IndicatorArea IndicatorArea{get;set;}public override IEnumerable<BusinessRule> 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
{/// <summary>/// 计划安排/// </summary>public class PlanArrange : ProjectBase{public PlanArrange(){JHSY = new IndicatorArea();SJSY = new IndicatorArea();}protected override string BussinessCode{get { return "103102"; }}/// <summary>/// 计划使用面积/// </summary>public IndicatorArea JHSY{get;set;}/// <summary>/// 实际使用面积/// </summary>public IndicatorArea SJSY{get;set;}/// <summary>/// 剩余面积/// </summary>public IndicatorArea SY{get{return JHSY - SJSY;}}/// <summary>/// 用地类别/// </summary>public string XMYDLB { get; set; }public override IEnumerable<BusinessRule> 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
{/// <summary>/// 文号/// </summary>public class DocumentNumber : ValueObject<DocumentNumber>, 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);}}/// <summary>/// 发文机关代字/// </summary>public string Code { get; set; }/// <summary>/// 年份/// </summary>public string Year { get; set; }private string order;/// <summary>/// 顺序号/// </summary>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
{/// <summary>/// 指标面积/// </summary>public class IndicatorArea : ValueObject<IndicatorArea>{/// <summary>/// 新增建设用地/// </summary>public decimal XZJSYD{get{return NYD + WLYD;}}/// <summary>/// 农用地/// </summary>public decimal NYD { get; set; }/// <summary>/// 耕地/// </summary>public decimal GD { get; set; }/// <summary>/// 未利用地/// </summary>public decimal WLYD { get; set; }/// <summary>/// 将公顷转换成亩/// </summary>/// <returns></returns>public IndicatorArea HectareToMu(){return new IndicatorArea{GD = this.GD * 15,NYD = this.NYD * 15,WLYD = this.WLYD * 15,};}/// <summary>/// 重载加法运算符/// </summary>/// <param name="a"></param>/// <param name="b"></param>/// <returns></returns>public static IndicatorArea operator +(IndicatorArea a, IndicatorArea b){return new IndicatorArea{GD = a.GD + b.GD,NYD = a.NYD + b.NYD,WLYD = a.WLYD + b.WLYD,};}/// <summary>/// 重载减法运算符/// </summary>/// <param name="a"></param>/// <param name="b"></param>/// <returns></returns>public static IndicatorArea operator -(IndicatorArea a, IndicatorArea b){return new IndicatorArea{GD = a.GD - b.GD,NYD = a.NYD - b.NYD,WLYD = a.WLYD - b.WLYD,};}public static IndicatorArea Sum(IEnumerable<IndicatorArea> 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
{/// <summary>/// 指标级别/// </summary>public enum IndicatorGrade{/// <summary>/// 国家/// </summary>[Description("国家")]Country,/// <summary>/// 省级/// </summary>[Description("省级")]Province,/// <summary>/// 市级/// </summary>[Description("市级")]City,/// <summary>/// 县级/// </summary>[Description("县级")]County,}
}
using System.ComponentModel;namespace DDD.Domain
{/// <summary>/// 项目状态/// </summary>public enum ProjectStauts{/// <summary>/// 默认状态，已登记/// </summary>Default,/// <summary>/// 已下发/// </summary>Sent,}
}
