Automapper Serialize/Deserialize source string to list using resolver

user_4444844 0
Viewed 1761

I am trying to map source string to List<T> for member but the value of the mapped member list property is always null.

Here is my code.

//Source model
public class Claims
{  
    public int Id { get; set; } 
    public string ClaimType {get; set; } 
    public string ClaimValue { get; set; } // produce json string [{"Action":"read","Status":"active"}]
}

// Dest model
public class ClaimsDto
{  
   public int Id { get; set; }
   public string ClaimType { get; set; } 
   public List<ResourceActions> ClaimValues { get; set; }
}


public class ResourceActions
{
  public string Action { get; set; }
  public string Status { get; set; }
}



CreateMap<ResourceActions, ResourceActions>();

CreateMap<Claims, ClaimsDto>()
.ForMember(dest => dest.ClaimValues,
 opt => opt.MapFrom( src=> JsonConvert.DeserializeObject<List<ResourceActions>>(src.ClaimValue))) 
.ReverseMap();

Also tried with resolver like this.

 .ForMember(dto => dto.ClaimValues, opt => opt.ResolveUsing<CustomResolver,string>(src=>src.ClaimValue ))

The resolver:

public class CustomResolver : IMemberValueResolver<Claims, ClaimsDto, string, List<ResourceActions>>
{
    public List<ResourceActions> Resolve(Claims source, ClaimsDto destination, string sourceMember, List<ResourceActions> destinationMember, ResolutionContext context)
    {
        var data = JsonConvert.DeserializeObject<List<ResourceActions>>(sourceMember);
        return context.Mapper.Map<List<ResourceActions>>(data); // not working
        return JsonConvert.DeserializeObject<List<ResourceActions>>(sourceMember); // not working
    }
}

And the controller

var mapped = _mapper.Map<List<ClaimsDto>>(source); // success without exception but the list property is null.

Other properties are mapped except this string to List<T> property.

asp.net-core-mvc asp.net-core automapper asp.net-mvc c#
1 Answers

I think this profile should solve the issue:

public class MyMapperProfile : Profile
{
    public MyMapperProfile()
    {
        CreateMap<Claims, ClaimsDto>()
            .ForMember(dto => dto.ClaimValues, cfg => cfg.MapFrom((claim, _) =>
               JsonSerializer.Deserialize<IReadOnlyCollection<ResourceActions>>(claim.ClaimValue)));
    }
}

Here is an example:

var config = new MapperConfiguration(cfg => cfg.AddProfile<MyMapperProfile>());
var mapper = config.CreateMapper();

var someClaims = new List<Claims>
{
    new Claims { Id = 5, ClaimType = "Foo", ClaimValue = @"[{""Action"":""read"",""Status"":""active""}]" },
    new Claims { Id = 7, ClaimType = "Bar", ClaimValue = @"[{""Action"":""create"",""Status"":""disabled""}]" },
};

var result = mapper.Map<List<ClaimsDto>>(someClaims);

foreach (var item in result)
{
    Console.WriteLine(JsonSerializer.Serialize(item));
}
user_18380480
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