使用Automapper测绘大领域模型数据库对象
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02-10-2019 - |
题
我想用Automapper到地图了我的模型对象的数据库对象。让我们说,数据库的目的是30多领域我想地图10的20性从我的模型。为了使它更复杂的,我需要地图不同的性质时更新记录的时候比我插入新的记录数据库。
该解决方案,我使用的是创建2个一般类插入以及更新和绘图档案,指定两映射。
例如下:
public abstract class SyncMappingWrapper<TFrom> where TFrom : class
{
protected SyncMappingWrapper(TFrom model)
{
Model = model;
}
public TFrom Model { get; private set; }
}
public class Update<TFrom> : SyncMappingWrapper<TFrom> where TFrom : class
{
public Update(TFrom model)
: base(model)
{
}
}
public class Insert<TFrom> : SyncMappingWrapper<TFrom> where TFrom : class
{
public Insert(TFrom model)
: base(model)
{
}
}
的映射,然而,越来越讨厌作为的循环的复杂性在天空中的(超过50)作为我需要定义忽略()对所有属性,我不在地图:
CreateMap<Update<OracleModel>, LiveModel>()
.ForMember(des => des.ApprovedBy, opt => opt.Ignore())
.ForMember(des => des.ApprovedDate, opt => opt.Ignore())
...
.ForMember(des => des.UNSPSC, opt => opt.Ignore())
.ForMember(des => des.BaseUnit, opt => opt.MapFrom(src => src.Model.UOM.BaseUOM.PerSalesUnit))
.ForMember(des => des.BaseUOM, opt => opt.MapFrom(src => src.Model.UOM.BaseUOM.UnitOfMeasure.Code))
.ForMember(des => des.SalesUnit, opt => opt.MapFrom(src => src.Model.UOM.SalesUOM.PerSalesUnit))
.ForMember(des => des.SalesUOM, opt => opt.MapFrom(src => src.Model.UOM.SalesUOM.UnitOfMeasure.Code))
.ForMember(des => des.OrderUnit, opt => opt.MapFrom(src => src.Model.UOM.OrderUOM.PerSalesUnit))
.ForMember(des => des.OrderUOM, opt => opt.MapFrom(src => src.Model.UOM.OrderUOM.UnitOfMeasure.Code))
.ForMember(des => des.SalesPrice, opt => opt.MapFrom(src => src.Model.Price.Value))
.ForMember(des => des.Alternate, opt => opt.Ignore())
.ForMember(des => des.ManufacturerID, opt => opt.Ignore())
.ForMember(des => des.ProductCode, opt => opt.MapFrom(src => src.Model.ProductCode))
.ForMember(des => des.ProductName, opt => opt.MapFrom(src => src.Model.ProductName))
.ForMember(des => des.ProductHTML, opt => opt.Ignore())
.ForMember(des => des.Version, opt => opt.Ignore())
...
.ForMember(des => des.UnitsOfMeasure2, opt => opt.Ignore())
.ForMember(des => des.Manufacturer, opt => opt.Ignore());
我已经解决了这个问题插入新的记录通过建立新的对象:
CreateMap<Insert<OracleModel>, LiveModel>()
.ConstructUsing(x => new LiveModel
{
BaseUnit = x.Model.UOM.BaseUOM.PerSalesUnit,
BaseUOM = x.Model.UOM.BaseUOM.UnitOfMeasure.Code,
SalesUnit = x.Model.UOM.SalesUOM.PerSalesUnit,
SalesUOM = x.Model.UOM.SalesUOM.UnitOfMeasure.Code,
OrderUnit = x.Model.UOM.OrderUOM.PerSalesUnit,
OrderUOM = x.Model.UOM.OrderUOM.UnitOfMeasure.Code,
SalesPrice = x.Model.Price.Value,
LeadTime = x.Model.LeadTime,
ProductCode = x.Model.ProductCode,
ProductName = x.Model.ProductName,
SupplierCode = x.Model.SupplierCode,
Weight = x.Model.Weight
})
.ForAllMembers(xc => xc.Ignore());
但是它不工作的更新,我想地图的特性,现有的对象并不是新的实例:
Mapper.Map(update, existingRecord);
我宁愿避免DynamicMap()保持完全控制映射(所以我不会的地图的一个随机性的错误).我的目标是整理出来的循环的复杂性问题。请不要建议ValueInjecter或任何其他方法。我在寻找解决方案内AutoMapper.
解决方案
这是五年以后,但这里有一个建议,以减少这映复杂的问题。你可以创建一个扩展,将帮助你忽略你所有成员在第一:
public static class AutoMapperExtension {
public static IMappingExpression<TSource, TDest> IgnoreAllMembers<TSource, TDest>(this IMappingExpression<TSource, TDest> expression) {
expression.ForAllMembers(opt => opt.Ignore());
return expression;
}
}
然后你用它来限定只能的映射你想要的执行:
Mapper.CreateMap<Insert<OracleModel>, LiveModel>()
.IgnoreAllMembers()
.ForMember(d => d.BaseUnit, o => o.MapFrom(s => s.Model.UOM.BaseUOM.PerSalesUnit))
/* Mapping for other members here. */;
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