Automapper custom map configuration problem

Question

I have two classes with "Points" member in both, but in one of them Points are string type and string[][] in anather class.

I use Automapper and the next configuration

x.CreateMap<ProblemViewModel, Problem>()
                    .ForMember(dest => dest.Points,
                        src => src.MapFrom{PointsForDbResolver}())
                    .ReverseMap()
                .ForMember(dest => dest.Points,
                    src => src.MapFrom{PointsForViewResolver}());

with custom value resolvers "PointsForDbResolver" and "PointsForViewResolver" (both are IValueResolver) that convert mentioned types in each other. But I get error:

Exception Details: System.InvalidOperationException: Sequence contains no elements

Coud you help me to resolve this problem and is it possible this transformation to be done by Automapper.

Can you show the code for the value resolvers?

devNull
– devNull

2020-01-23 23:01:47 +00:00
Commented Jan 23, 2020 at 23:01 — devNull
– devNull, Commented Jan 23, 2020 at 23:01
Also the source and destination members (including types)

devNull
– devNull

2020-01-23 23:02:39 +00:00
Commented Jan 23, 2020 at 23:02 — devNull
– devNull, Commented Jan 23, 2020 at 23:02

Ahmed Matem Ahmed · Accepted Answer · 2020-01-24 20:41:57Z

Next is resolver from string[][] to string

public class PointsToDbResolver : IValueResolver<ProblemViewModel, Problem, string>
{
    public string Resolve(
        ProblemViewModel source,
        Problem destination,
        string destMember, 
        ResolutionContext context)
    {
        if (source == null)
        {
            return null;
        }

        StringBuilder result = new StringBuilder();
        for (int row = 0; row < source.Points.GetLength(0); row++)
        {
            for (int col = 0; col < source.Points[row].Length; col++)
            {
                result.Append(source.Points[row][col]).Append(Constants.PointsColSeparator);
            }
            result.Replace(
                Constants.PointsColSeparator,
                Constants.PointsRowSeparator,
                result.Length - 1, 1);
        }
        result.Remove(result.Length - 1, 1);

        return result.ToString();
    }

and from string to string[][]

public class PointsToViewResolver : IValueResolver<Problem, ProblemViewModel, string[][]>
{
    public string[][] Resolve(
        Problem source,
        ProblemViewModel destination,
        string[][] destMember, 
        ResolutionContext context)
    {
        if (source.Points == null)
        {
            return new string[0][];
        }

        var rows = source.Points.Split(new string[] { Constants.PointsRowSeparator },
            StringSplitOptions.None);
        string[][] result = new string[rows.Length][];
        for (int row = 0; row < rows.Length; row++)
        {
            result[row] =
                rows[row].Split(new string[] { Constants.PointsColSeparator },
                StringSplitOptions.None);
        }

        return result;
    }
}

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