使用AutoMapper映射子集合 [英] Mapping Child Collections using AutoMapper

问题描述

我使用Automapper制作对象

I am using Automapper for making a copy of an object

我的域名是可以还原成下面的例子中

My domain can be reduced into this following example

考虑我有一个商店与地点集合

public class Store
{
    public string Name { get; set;}

    public Person Owner {get;set;}

    public IList<Location> Locations { get; set;}
}

下面是一个存储实例的一个例子

Below is an example of a store instance

var source = new Store 
            {           
                Name = "Worst Buy",
                Owner = new Person { Name= "someone", OtherDetails= "someone" },
                Locations = new List<Location>
                            {
                                new Location { Id = 1, Address ="abc" },
                                new Location { Id = 2, Address ="abc" }
                            }
            };

我的映射配置为

My Mappings are configured as

var configuration = new ConfigurationStore(
                       new TypeMapFactory(), MapperRegistry.AllMappers());

configuration.CreateMap<Store,Store>();
configuration.CreateMap<Person,Person>();
configuration.CreateMap<Location,Location>();

我得到的映射的实例作为

I get the mapped instance as

var destination = new MappingEngine(configuration).Map<Store,Store>(source);

目标对象，我从映射得到具有位置集合，相同的两个实例出现在源，这是

The destination object I get from mapping has a Locations collection with the same two instances present in the source, that is

Object.ReferenceEquals（source.Locations [0]，destination.Locations [0]）收益 TRUE

我的问题是

如何配置Automapper创建位置的新实例，同时映射。

How can I configure Automapper to create new instances of Location while mapping.

推荐答案

在创建的地图，你可以使用的方法和该方法几乎可以做到任何东西。例如：

When creating the maps you can use a method and that method can do pretty much anything. For example:

public void MapStuff()
{
    Mapper.CreateMap<StoreDTO, Store>()
        .ForMember(dest => dest.Location, opt => opt.MapFrom(source => DoMyCleverMagic(source)));
}

private ReturnType DoMyCleverMagic(Location source)
{
    //Now you can do what the hell you like. 
    //Make sure to return whatever type is set in the destination
}

使用这种方法，你可以通过它的编号在 StoreDTO ，它可以实例化一个位置：）

Using this method you could pass it an Id in the StoreDTO and it can instantiate a location :)

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