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POAutoMapper: Mapping between the two collections with 'Ignore'
 

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    <p>I'm using AutoMapper to map between the two collections. What I see is that the option <code>Ignore</code> is not working at this scenario as expected. What i'm expecting can be see in the method <code>AutoMapperIgnore_TwoObjectMappedWithIgnoreId_SameWithUnchangedIdAndNewPrice()</code>. In other two test methods is the <code>Id</code> although ignored but every object in the collection is created once again with the consequences that original values are going to be lost. There is possibility to use <code>UseDestinationValue</code>, but I think this make only sense on the classes where collection are members of it. How can I use the option <code>Ignore</code> on the collections?</p> <pre><code>[TestClass] public class AutoMapperTests { private readonly IEnumerable&lt;Dto&gt; _testDtos; private readonly IEnumerable&lt;Entity&gt; _testEntities; public AutoMapperTests() { _testDtos = new List&lt;Dto&gt; { new Dto() { Id = 0, Fk_Id = 8, Price = 350000 } }; _testEntities = new List&lt;Entity&gt; { new Entity() { Id = 8, Price = 68000 } , new Entity() { Id = 6, Price = 350000 } }; } [TestInitialize] public void TestInitialize() { Mapper.Reset(); } [TestMethod] public void AutoMapperIgnore_TwoCollectionsWithOneCommonElementMappedFromDtoToEntityIgnoreId_SameWithUnchangedIdAndNewPrice() { //Assign Mapper.CreateMap&lt;Dto, Entity&gt;() .ForMember(destination =&gt; destination.Id, opt =&gt; opt.Ignore()); AutoMapperIgnore_TwoCollectionsWithOneCommonElementMappedFromDtoToEntity_SameWithUnchangedIdAndNewPrice(true); } [TestMethod] public void AutoMapperIgnore_TwoCollectionsWithOneCommonElementMappedFromDtoToEntityUseDestinationtValueForId_SameWithUnchangedIdAndNewPrice() { //Assign Mapper.CreateMap&lt;Dto, Entity&gt;() .ForMember(destination =&gt; destination.Id, opt =&gt; opt.UseDestinationValue()); AutoMapperIgnore_TwoCollectionsWithOneCommonElementMappedFromDtoToEntity_SameWithUnchangedIdAndNewPrice(true); } private void AutoMapperIgnore_TwoCollectionsWithOneCommonElementMappedFromDtoToEntity_SameWithUnchangedIdAndNewPrice(bool isExceptedSame) { //Assign var exceptedPrice = _testDtos.First().Price; //Act IEnumerable&lt;Entity&gt; foundEntities = _testEntities.Join(_testDtos, e =&gt; e.Id, e =&gt; e.Fk_Id, (entity, dto) =&gt; entity).ToList(); Entity entityBeforeMapping = foundEntities.First(); Mapper.Map(_testDtos, foundEntities); Entity entityAfterMapping = foundEntities.First(); //Assert if (isExceptedSame) { Assert.AreSame(entityBeforeMapping, entityAfterMapping); } Assert.AreEqual(entityBeforeMapping.Id, entityAfterMapping.Id); Assert.AreEqual(exceptedPrice, entityAfterMapping.Price); } [TestMethod] public void AutoMapperIgnore_TwoObjectMappedWithIgnoreId_SameWithUnchangedIdAndNewPrice() { //Assign Mapper.CreateMap&lt;Dto, Entity&gt;() .ForMember(destination =&gt; destination.Id, opt =&gt; opt.Ignore()); var testDto = new Dto() { Id = 0, Fk_Id = 8, Price = 350000 }; var testEntity = new Entity() { Id = 8, Price = 68000 }; var exceptedPrice = testDto.Price; //Act Entity entityBeforeMapping = testEntity; Mapper.Map(testDto, testEntity); Entity entityAfterMapping = testEntity; //Assert Assert.AreSame(entityBeforeMapping, entityAfterMapping); Assert.AreEqual(entityBeforeMapping.Id, entityAfterMapping.Id); Assert.AreEqual(exceptedPrice, entityAfterMapping.Price); } internal class Dto { public int Id { get; set; } public int Fk_Id { get; set; } public Single? Price { get; set; } } internal class Entity { public int Id { get; set; } public Single? Price { get; set; } } } </code></pre>
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