自动映射和从集合或列表继承

Question

I'm trying to use AutoMapper (v5.1.1) to map an object which inherits from a List or Collection. The map call does not give me an error but the output is an empty list (of correct type though).

I can get a List<DestinationObject> or Collection<DestinationObject> , but it does not seem to work when having a custom class which enherits from List<T> or Collection<T> .

I've tried extending the first map definition to include the base class ( List<T> ) but that gives me a StackOverflowException.

cfg.CreateMap(typeof(SourceCollection), typeof(DestinationCollection)).Include(typeof(List<SourceObject>), typeof(List<DestinationObject>)); 

What am I missing here?

public class SourceCollection : List<SourceObject> {

}

public class DestinationCollection : List<DestinationObject> {

}

public class SourceObject {

    public string Message { get; set; }
}

public class DestinationObject {

  public string Message { get; set; }
}


static void Main(string[] args)
{

    AutoMapper.Mapper.Initialize(cfg =>
    {
        cfg.CreateMap(typeof(SourceCollection), typeof(DestinationCollection)); 
        cfg.CreateMap<List<SourceObject>, List<DestinationObject>>().Include<SourceCollection, DestinationCollection>();
        cfg.CreateMap(typeof(SourceObject), typeof(DestinationObject));
    });

    AutoMapper.Mapper.AssertConfigurationIsValid();

    SourceCollection srcCol = new SourceCollection() { new SourceObject() { Message = "1" }, new SourceObject() { Message = "2" } };
    DestinationCollection dstCol = AutoMapper.Mapper.Map<SourceCollection, DestinationCollection>(srcCol);
}

Answer 1

您只需要将sourceobject映射到destinationobject，AutoMapper将完成其余的工作，有关更多信息，请参见此链接。

cfg.CreateMap(typeof(SourceObject), typeof(DestinationObject));