C# 自动映射从列表到对象的复杂映射
我的对象结构如下C# 自动映射从列表到对象的复杂映射,c#,.net,automapper,C#,.net,Automapper,我的对象结构如下 public class Source { public Connection Connection { get; set;} } public class Connection { public string Id { get; set; public IEnumerable<Distributor> Distributors { get; set; } public class Distributor { get; set; } {
public class Source
{
public Connection Connection { get; set;}
}
public class Connection
{
public string Id { get; set;
public IEnumerable<Distributor> Distributors { get; set;
}
public class Distributor { get; set; }
{
public DistributorType Type {get; set;}
public string X { get; set; }
public string Y { get; set; }
}
public class Destination
{
public Distribution Distribution { get; set;
}
public class Distribution
{
public string Id { get; set;}
public string X { get; set; }
public string Y { get; set; }
}
我尝试过使用自定义解析器,但没有成功
public class CustomDistributorResolver : IValueResolver<Source, Destination, Distribution >
{
public Distribution Resolve(Source source, Destination destination, Distribution destMember, ResolutionContext context)
{
var result = source.Connection.Distributors.FirstOrDefault(x => x.DistributorType =="ABC");
if (result == null) return null;
return new Distribution
{
Id = source.Connection?.Id,
X = result.X,
Y = result.Y
};
}
}
公共类CustomDistributorResolver:IValueResolver
{
公共分发解析(源、目标、分发目标成员、ResolutionContext上下文)
{
var result=source.Connection.Distributors.FirstOrDefault(x=>x.DistributorType==“ABC”);
if(result==null)返回null;
返回新发行版
{
Id=源.Connection?.Id,
X=结果.X,
Y=结果。Y
};
}
}
映射Pofile
CreateMap()
.ForMember(d=>d.Distribution,opt=>opt.MapFrom(新的CustomDistributorResolver());
我总是将分布值设置为NULL
我不确定我在地图上做错了什么
-艾伦-我不太确定你将如何处理这个数字。所以我用linq来接近
var id = Source.Connection.Id;
var distributions = Source.Connection.Distributors.Select(m=> new Distribution()
{
Id = id,
X = m.X,
Y = m.Y,
});
Automapper希望:
CreateMap<Source, Destination>()
.ForMember(dest => dest.Distribution.Id ,opt => opt.MapFrom(src => src.Connection.Id))
.ForMember(dest => dest.Distribution.X, opt => opt.MapFrom(src => src.Connection.Distributors.FirstOrDefault().X))
.ForMember(dest => dest.Distribution.Y, opt => opt.MapFrom(src => src.Connection.Distributors.FirstOrDefault().Y));
CreateMap()
.ForMember(dest=>dest.Distribution.Id,opt=>opt.MapFrom(src=>src.Connection.Id))
.FormMember(dest=>dest.Distribution.X,opt=>opt.MapFrom(src=>src.Connection.Distributors.FirstOrDefault().X))
.FormMember(dest=>dest.Distribution.Y,opt=>opt.MapFrom(src=>src.Connection.Distributors.FirstOrDefault().Y));
您可以使用类型转换器
private class DestinationConverter : ITypeConverter<Source, Destination>
{
public Destination Convert(Source source,
Destination destination,
ResolutionContext context)
{
var result = source.Connection.Distributors.FirstOrDefault(x => x.Type == "ABC");
if (result == null) return null;
destination = new Destination();
destination.Distribution = new Distribution
{
Id = source.Connection?.Id,
X = result.X,
Y = result.Y
};
return destination;
}
}
CreateMap<Source, Destination>().ConvertUsing<DestinationConverter>();
专用类DestinationConverter:ITypeConverter
{
公共目标转换(源、源、,
目的地,
决议(上下文)
{
var result=source.Connection.Distributors.FirstOrDefault(x=>x.Type==“ABC”);
if(result==null)返回null;
目的地=新目的地();
destination.Distribution=新分发
{
Id=源.Connection?.Id,
X=结果.X,
Y=结果。Y
};
返回目的地;
}
}
并注册转换器
private class DestinationConverter : ITypeConverter<Source, Destination>
{
public Destination Convert(Source source,
Destination destination,
ResolutionContext context)
{
var result = source.Connection.Distributors.FirstOrDefault(x => x.Type == "ABC");
if (result == null) return null;
destination = new Destination();
destination.Distribution = new Distribution
{
Id = source.Connection?.Id,
X = result.X,
Y = result.Y
};
return destination;
}
}
CreateMap<Source, Destination>().ConvertUsing<DestinationConverter>();
CreateMap().ConvertUsing();
我现在不在我的windows PC附近,但我有一些类似的东西,我认为这是由于EF core中的延迟加载设置。可能值得检查一下。ForMember(d=>d.Distribution,o=>o.MapFrom(s=>s.Connection.Distributors.FirstOrDefault(x=>x.DistributorType==“ABC”))
我知道这是手动映射,但我认为这是本案例的唯一可能解决方案,因为第一个默认研究。作者提到CustomDistributorResolver,所以我尝试了另一种映射的可能解决方案。不,不是。正如我上面所评论的,您可以将该查询放在映射中,并可能通过eId
在上下文中。项目
。对不起,再来一次-:)。分发中的属性Id为source.Connection?.Id。您的解决方案Id未映射,因为分发服务器中不存在。结果是X和Y来自一个类(分发服务器),ID来自另一个类(连接)。我已经讨论过了。另一个选项是从源.Connection
映射。