RSGC – DTO Mapper – part 6

AutoMapping from a POCO to a DTO. Lots of customizations
 

The code that you start with is

    public class Department                                    

        {

            public int ID { get; set; }

            public string Name { get; set; }

            

            public List<string> Employees { get; set; }

        }

    

        [IgnoreInTarget("Employees")]

        [MapFrom(typeof(Department))]

        public class DepartmentDTO

        {

            public int ID { get; set; }

            public string Name{get; set;}

    

            [MapWith("Employees",typeof(ResolverLength))]

            public int EmployeesNr { get; set; }

    

        }

        public class ResolverLength

        {

            public int Resolve(List<string> input)

            {

                return ((input?.Count) ?? 0);

            }

        }

The code that you will use is

    static void Main(string[] args)                                

    {

        var dep = new Department();

        dep.Name = "IT";

        dep.ID = 1;

        dep.Employees = new List<string>();

        dep.Employees.Add("Andrei");

        var dto = dep.MapToDepartmentDTO();

        Console.WriteLine(dto.Name+"=>"+ dto.EmployeesNr);

    }

The code that is generated is

    namespace DTOMapper                                                                                                                                                                                                        

    {

        public static partial class DepartmentMapToExtensions

        {

            public static DTOMapper.DepartmentDTO MapToDepartmentDTO(this DTOMapper.Department self)

            {

                if (self is null)

                {

                    throw new ArgumentNullException(nameof(self),"DTOMapper.Department -> DTOMapper.DepartmentDTO: Source is null.");

                }

                

                var resolverLength = new DTOMapper.ResolverLength();

                

                var target = new DTOMapper.DepartmentDTO

                {

                    ID = self.ID,

                    Name = (self.Name ?? throw new GeneratedMapper.Exceptions.PropertyNullException("DTOMapper.Department -> DTOMapper.DepartmentDTO: Property Name is null.")),

                    EmployeesNr = resolverLength.Resolve((self.Employees ?? throw new GeneratedMapper.Exceptions.PropertyNullException("DTOMapper.Department -> DTOMapper.DepartmentDTO: Property Employees is null."))),

                };

                

                return target;

            }

        }

    }

    

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/DTOMapper