Mapping the 'count' on child list property in AutoMapper

问题

I am working in an ASP.NET MVC 4 application, and have something similar to this for my domain.

public class Party
{
    public Cake PartyCake { get; set; }
    public List<Candles> CakeCandles { get; set; }
}

I want to map that to the PartyVM which looks like so:

public class PartyVM
{
    public string PartyCakeName { get; set; }
    public int CandlesCount { get; set; }
}

How can I tell AutoMapper to work out the Count of the list when doing its mappings? I have this, but all this does is tell it to ignore!

Mapper.CreateMap<Party, PartyVM>()
            .ForMember(dest => dest.CandlesCount, opt => opt.Ignore());

Thanks.

回答1:

AutoMapper supports Count out of the box, your destination member is just named incorrectly. If you name your PartyVM property "CakeCandlesCount" it will have the right value.

来源：https://stackoverflow.com/questions/22400687/mapping-the-count-on-child-list-property-in-automapper