Automapper: Mapping a property value of an object to a string

Question

Using Automapper, how do you handle the mapping of a property value on an object to an instance of a string. Basically I have a list of Role objects and I want to use Automapper to map the content of each "name" property to a corresponding list of string (so I just end up with a list of strings). I'm sure it has an obvious answer, but I can't find the mapping that I need to add to "CreateMap" to get it to work.

An example of the relevant code is shown below:

public class Role
{
   public Guid Id{get;set;}
   public string Name{get;set;}
   ...
   ...
}

// What goes in here?
Mapper.CreateMap<Role, string>().ForMember(....);

var allRoles = Mapper.Map<IList<Role>, IList<string>>(roles);

Adam · Accepted Answer · 2012-09-26 15:20:14Z

59

I love Automapper (and use it in a number of projects), but wouldn't this be easier with a simple LINQ statement?

var allRoles = from r in roles select r.Name

The AutoMapper way of accomplishing this:

Mapper.CreateMap<Role, String>().ConvertUsing(r => r.Name);

edited Sep 26, 2012 at 15:20

Adam

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answered Dec 14, 2010 at 14:17

PatrickSteele

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6 Comments

Paul Hadfield Over a year ago

In this instance you are probably right and it would fit in with our infrastructure, but even so I'd be interested in knowing if/how it could be done with Automapper.

PatrickSteele Over a year ago

Sorry -- should have answered your original question. :) This should work: Mapper.CreateMap<Role, String>().ConvertUsing(r => r.Name);

Paul Hadfield Over a year ago

Thanks for providing an Automapper way of doing this, it works exactly as I'd hoped.

Chris Over a year ago

How do you do the reverse, setting the role from the string?

Nibor Over a year ago

@Chris -- Automapper way to do the reverse: Mapper.CreateMap<string, Role>().ForMember(dest => dest.Name, opt => opt.MapFrom(src => src)) should work I think.

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