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,
}
}