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    copied!<p>While Automapper is not designed with this in mind, it's powerful enough to let you do it, using <a href="https://github.com/AutoMapper/AutoMapper/wiki/Custom-type-converters" rel="nofollow">custom type converters</a>. You need to create your own converter from <code>IList&lt;House&gt;</code> to <code>IList&lt;HouseDto&gt;</code>, and inject it using a factory:</p> <pre><code>using System; using System.Collections.Generic; using AutoMapper; using NUnit.Framework; using SharpTestsEx; namespace StackOverflowExample { public class House { public string Address { get; set; } } public class Person { public IList&lt;House&gt; OwnedHouse { get; set; } } public class HouseDto { public string Address { get; set; } } public class PersonDto { public IList&lt;HouseDto&gt; OwnedHouse { get; set; } } [TestFixture] public class AutomapperTest { public interface IHouseListConverter : ITypeConverter&lt;IList&lt;House&gt;, IList&lt;HouseDto&gt;&gt; { } public class HouseListConverter : IHouseListConverter { private readonly IDictionary&lt;House, HouseDto&gt; existingMappings; public HouseListConverter(IDictionary&lt;House, HouseDto&gt; existingMappings) { this.existingMappings = existingMappings; } public IList&lt;HouseDto&gt; Convert(ResolutionContext context) { var houses = context.SourceValue as IList&lt;House&gt;; if (houses == null) { return null; } var dtos = new List&lt;HouseDto&gt;(); foreach (var house in houses) { HouseDto mapped = null; if (existingMappings.ContainsKey(house)) { mapped = existingMappings[house]; } else { mapped = Mapper.Map&lt;HouseDto&gt;(house); existingMappings[house] = mapped; } dtos.Add(mapped); } return dtos; } } public class ConverterFactory { private readonly IHouseListConverter resolver; public ConverterFactory() { resolver = new HouseListConverter(new Dictionary&lt;House, HouseDto&gt;()); } public object Resolve(Type t) { return t == typeof(IHouseListConverter) ? resolver : null; } } [Test] public void CustomResolverTest() { Mapper.CreateMap&lt;House, HouseDto&gt;(); Mapper.CreateMap&lt;IList&lt;House&gt;, IList&lt;HouseDto&gt;&gt;().ConvertUsing&lt;IHouseListConverter&gt;(); Mapper.CreateMap&lt;Person, PersonDto&gt;(); var house = new House {Address = "any"}; var john = new Person {OwnedHouse = new List&lt;House&gt; {house}}; var will = new Person { OwnedHouse = new List&lt;House&gt; { house } }; var converterFactory = new ConverterFactory(); var johnDto = Mapper.Map&lt;PersonDto&gt;(john, o=&gt;o.ConstructServicesUsing(converterFactory.Resolve)); var willDto = Mapper.Map&lt;PersonDto&gt;(will, o=&gt;o.ConstructServicesUsing(converterFactory.Resolve)); johnDto.OwnedHouse[0].Should().Be.SameInstanceAs(willDto.OwnedHouse[0]); johnDto.OwnedHouse[0].Address.Should().Be("any"); } } } </code></pre>
 

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