I have tried using a custom converted

CreateMap<ChildB, string>().ConvertUsing(src => src.Name);

But I run into the scenario when I want to sometimes get the string like above or sometimes I want to just get the Guid: CreateMap<ChildB, Guid>().ConvertUsing(src => src.Id);

It seems to throw and error as it always converts the Name. The Objects are like this:

public class ParentA
{
 public Guid Id {get;set;}
 public string Name {get;set;}
 public ICollection<ChildB>? {get;set;}
 ...
}

public class ChildB
{
 public Guid Id {get;set;}
 public string Name {get;set;}
 ...
}
public class ParentADTO1
{
 public Guid Id {get;set;}
 public string Name {get;set;}
 public ICollection<string> ChildNames{get;set;}
 ...
}
public class ParentADTO2
{
 public Guid Id {get;set;}
 public string Name {get;set;}
 public ICollection<Guid> ChildIds {get;set;}
 ...
}

So the question is, can I use the CreateMap function like so:

CreateMap<ParentA,ParentADTO1>()
  ...
 .ForMember(ent => ent.ChildNames, opt => opt.MapFrom(???))

CreateMap<ParentA,ParentADTO2>()
  ...
 .ForMember(ent => ent.ChildIds, opt => opt.MapFrom(???))

Your help is greatly appreciated!!

Thanks Jon

CodePudding user response：

You can set up the mapping configuration like this (I suppose the property is named Children):

public class ParentA
{
 public Guid Id {get;set;}
 public string Name {get;set;}
 public ICollection<ChildB> Children {get;set;}
 // ...
}

CreateMap<ParentA,ParentADTO1>()
  // ...
 .ForMember(ent => ent.ChildNames, opt => opt.MapFrom(x => x.Children.Select(y => y.Name).ToArray()))

CreateMap<ParentA,ParentADTO2>()
  // ...
 .ForMember(ent => ent.ChildIds, opt => opt.MapFrom(x => x.Children.Select(y => y.Id).ToArray()))