CODEWITHSUNDEEP
c#asp.net-coreautomapper
chuckd
chuckd

Reputation: 14550

Using ASP.Net Core automapper and trying to check if the value is null so I can set the value conditionally

Using automapper to fetch first image that is the 'IsMain' and will set PhotoUrl to null if no image exists. But now I want to check if the image is null and add another condition to set the url to something else, such as 

if (src.Photos.FirstOrDefault(p => p.IsMain) == null) {
   if (user.gender == 'male') {
     // set PhotoUrl to something here
   }
}

here is my automapper create map call

CreateMap<User, UserForListDto>()
  .ForMember(dest => dest.PhotoUrl, opt => {
      opt.MapFrom(src => src.Photos.FirstOrDefault(p => p.IsMain).Url);
   })
});

I tried adding an extension like this, but it doesn't even get called if the value is null.

opt.MapFrom(src => src.Photos.FirstOrDefault(p => p.IsMain).Url.GetDefaultMemberImage(src.Gender));

public static string GetDefaultMemberImage(this string photoUrl, string gender) {
        if (photoUrl == null) {
            if (gender == "male") {
                return "url1";
            } else {
                return "url2";
            }
        } else {
            return photoUrl;
        }
    }

I was thinking I could change "src.Photos.FirstOrDefault()" to something else, but not sure what?

Upvotes: 1

Views: 1118

Answers (1)

Edward
Edward

Reputation: 29996

For opt.MapFrom, you could use expression to check whether the src.Photos.FirstOrDefault(p => p.IsMain) is null.

Try something like 

CreateMap<UserPhoto, UserPhotoDto>()
    .ForMember(dest => dest.PhotoUrl, opt => opt.MapFrom(src =>
    src.Photos.FirstOrDefault(p => p.IsMain) == null ? (src.Gender == "male" ? "url1" : "url2") : src.Photos.FirstOrDefault(p => p.IsMain).Url));

Upvotes: 1

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