C#•9mo ago

IValueResolver won't work with AutoMapper

Hi guys , hope all of you doing well, I'm recently working on a project where I need to convert a special type of values to Datetime as the following example :

public class GetLinkByIdQueryMappingProfile: Profile
{
    public GetLinkByIdQueryMappingProfile()
    {
        CreateMap<GetLinkByIdQuery, GetLinkByIdRequest>();

        CreateMap<GetLinkByIdResponse, GetLinkByIdQueryResultDTO>()
            .ForMember(dest => dest.CreationDateAndTime, opt => opt.MapFrom(src => src.Link.CreationDateAndTime.ToDateTime()))
            .ForMember(dest => dest.ExpirationDateAndTime, opt => opt.MapFrom(src => src.Link.ExpirationDateAndTime.ToDateTime()))
            .ForMember(dest => dest.IsActive, opt => opt.MapFrom(src => src.Link.IsActive));
    }
}

public class GetLinkByIdQueryMappingProfile: Profile
{
    public GetLinkByIdQueryMappingProfile()
    {
        CreateMap<GetLinkByIdQuery, GetLinkByIdRequest>();

        CreateMap<GetLinkByIdResponse, GetLinkByIdQueryResultDTO>()
            .ForMember(dest => dest.CreationDateAndTime, opt => opt.MapFrom(src => src.Link.CreationDateAndTime.ToDateTime()))
            .ForMember(dest => dest.ExpirationDateAndTime, opt => opt.MapFrom(src => src.Link.ExpirationDateAndTime.ToDateTime()))
            .ForMember(dest => dest.IsActive, opt => opt.MapFrom(src => src.Link.IsActive));
    }
}

As yiou will notice that many times I will need to manually tell the Automapper how to convert the Google.Protobuf.WellKnownTypes.Timestamp date and time to C# DateTime So, I read before a bout something called IValueResolver in Automapper, so I created my custom IValueResolver to do this job instead of repteat it like the following :

public class GoogleTimestampToDateTimeValueResolver : IValueResolver<Timestamp, DateTime, DateTime>
{
    public DateTime Resolve(Timestamp source, DateTime destination, DateTime destMember, ResolutionContext context)
    {
        return source.ToDateTime();
    }
}

public class GoogleTimestampToDateTimeValueResolver : IValueResolver<Timestamp, DateTime, DateTime>
{
    public DateTime Resolve(Timestamp source, DateTime destination, DateTime destMember, ResolutionContext context)
    {
        return source.ToDateTime();
    }
}

Bu after using it like the following

            .ForMember(dest => dest.CreationDateAndTime, opt => opt.MapFrom<GoogleTimestampToDateTimeValueResolver>())
            .ForMember(dest => dest.ExpirationDateAndTime, opt => opt.MapFrom<GoogleTimestampToDateTimeValueResolver>())

            .ForMember(dest => dest.CreationDateAndTime, opt => opt.MapFrom<GoogleTimestampToDateTimeValueResolver>())
            .ForMember(dest => dest.ExpirationDateAndTime, opt => opt.MapFrom<GoogleTimestampToDateTimeValueResolver>())

I got a Compile-Time error saying the message in the attached picture Please any help to fix this issue ? Massive thanks in advance <3

7 Replies

dreadfullydistinct•9mo ago

I have some resolvers working and the signature I use is IValueResolver<CharaList, DbPlayerCharaData, ushort>, so IValueResolver<TRootStartingType, TRootDestinationType, TProperty>

M B V R KOP•9mo ago

Should the Resolver return the original object of class that used iduring mapping ?

dreadfullydistinct•9mo ago

I want to say it returns the value but $tias

MODiX•9mo ago

https://images-ext-1.discordapp.net/external/CO2vsU2aXbRqYy1RdewOYnkBq1nGFBjdbjlNgjvG67A/https/media.discordapp.net/attachments/364492811489509376/964064233035816990/unknown.png?width=543&height=257

M B V R KOP•9mo ago

But that will be strongly typed, and I want that resolver to be Generic

M B V R KOP•9mo ago

https://cdn.discordapp.com/emojis/607633201963204625.webp?size=64

dreadfullydistinct•9mo ago

You can probably make it generic and pass the generics into the interface def But I have never done that before

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IValueResolver won't work with AutoMapper