error in automapper with child type

Question

i'm having an error during automapper in win app in c# this row:

  config.CreateMap<T432, PROC>()
 .ForMember(d => d.TIPO.COD_TIPO , o => o.MapFrom(s => s.COD_TIPO))

the error is : Expression 'd => d.TIPO.COD_TIPO' must resolve to top-level member and not any child object's properties. Use a custom resolver on the child type or the AfterMap option instead.\r\nNome parametro: lambdaExpression"}

where

 class T432
 {
    public string COD_TIPO { get; set; }
 }
 class PROC 
 {
    public TIPO_PROC TIPO { get; set; }
 }
 class TIPO_PROC
 {
    public string COD_TIPO { get; set; }
 }

how is correct automapper?

thanks in advance

Ric Ric · Accepted Answer · 2014-11-14T09:49:29

You need to use a custom type converter as AutoMapper cannot configure "nested" objects and only sets top level properties, take a look at the example on the automapper site https://automapper.codeplex.com/wikipage?title=Custom%20Type%20Converters

here is the example:

Mapper.CreateMap<string, DateTime>().ConvertUsing(new DateTimeTypeConverter());

public class DateTimeTypeConverter : ITypeConverter<string, DateTime>
{
    public DateTime Convert(string source)
    {
        return System.Convert.ToDateTime(source);
    }
}

This will map a string to a DateTime object. You can easily substitute your own types and provide any configuration within the Convert method.

error in automapper with child type

2 Answers