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POAn exception of type 'AutoMapper.AutoMapperMappingException' occurred in AutoMapper.dll but was not handled in user code
 

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  1. POAn exception of type 'AutoMapper.AutoMapperMappingException' occurred in AutoMapper.dll but was not handled in user code
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    <p>Somehow my code doesn't work any more (it did work before with the exact same code). This is the problem:</p> <p><strong>The code</strong></p> <p>I'm trying to map some objects to ViewModels with this code:</p> <p>Configuration:</p> <pre><code>Mapper.CreateMap&lt;BookcaseItem, FoundBookcaseItemViewModel&gt;() .ForMember(x =&gt; x.Title, opt =&gt; opt.MapFrom(src =&gt; src.Book.Title)) .ForMember(x =&gt; x.Authors, opt =&gt; opt.MapFrom(src =&gt; src.Book.Authors.Select(x =&gt; x.Name).Aggregate((i, j) =&gt; i + ", " + j))) .ForMember(x =&gt; x.Identifiers, opt =&gt; opt.MapFrom(src =&gt; (!string.IsNullOrEmpty(src.Book.Isbn10) ? ("ISBN10: " + src.Book.Isbn10 + "\r\n") : string.Empty) + (!string.IsNullOrEmpty(src.Book.Isbn13) ? ("ISBN13: " + src.Book.Isbn13) : string.Empty))) .ForMember(x =&gt; x.Pages, opt =&gt; opt.MapFrom(src =&gt; src.Book.Pages)) .ForMember(x =&gt; x.ImageUri, opt =&gt; opt.MapFrom(src =&gt; src.Book.ThumbnailUriSmall)); </code></pre> <p>The usage:</p> <pre><code>public ActionResult Index() { string facebookId = _accountService.GetLoggedInUserFacebookId(); IEnumerable&lt;BookcaseItem&gt; items = _bookcaseItemService.GetBookcaseItemsForUser(facebookId); IEnumerable&lt;FoundBookcaseItemViewModel&gt; viewModels = items.Select(Mapper.Map&lt;BookcaseItem, FoundBookcaseItemViewModel&gt;); return PartialView(viewModels); } </code></pre> <p><strong>The error</strong></p> <p>This results in the following error:</p> <blockquote> <p>An exception of type 'AutoMapper.AutoMapperMappingException' occurred in AutoMapper.dll but was not handled in user code</p> </blockquote> <p><strong>The debug data</strong></p> <p>First of all I ensure that there are no configuration errors by calling:</p> <pre><code>Mapper.AssertConfigurationIsValid(); </code></pre> <p>I've set breakpoints all over my code and try to debug it, but I can't make sense of it. The 'items' collection is filled with data (proxy classes generated by Entity Framework), but the the 'viewModels' collection is filled with strange data. It has a 'message' that says this:</p> <blockquote> <p>Mapping types: BookcaseItem_B9B52593B2659AC05C47AB2A6E0F7AEA9989CC34D3527DF5B6AA988ED57166FB -> String System.Data.Entity.DynamicProxies.BookcaseItem_B9B52593B2659AC05C47AB2A6E0F7AEA9989CC34D3527DF5B6AA988ED57166FB -> System.String</p> <p>Destination path: FoundBookcaseItemViewModel.Authors</p> <p>Source value: System.Data.Entity.DynamicProxies.BookcaseItem_B9B52593B2659AC05C47AB2A6E0F7AEA9989CC34D3527DF5B6AA988ED57166FB</p> </blockquote> <p>And then there's a stacktrace property that says:</p> <blockquote> <p>at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()</p> <p>at System.Linq.SystemCore_EnumerableDebugView`1.get_Items()</p> </blockquote> <p>Oh and finally there's another property called 'context' with the following data:</p> <p><img src="https://i.stack.imgur.com/ornAS.png" alt="enter image description here"></p> <p>Can anyone explain what's going on here and why my code isn't working any longer? I did a couple of changes to my solution recently, but I've rolled them back by Git, so they shouldn't have any effect on the code.</p> <p><strong>My setup</strong></p> <ul> <li>Visual Studio 12 RC</li> <li>ASP.NET MVC 4</li> <li>.NET Framework 4.0 (I had 4.5 but that caused too many errors, so I rolled back with Git to version 4.0)</li> <li>Entity Framework 5.0 RC</li> <li>AutoMapper 2.1.267</li> </ul> <p><strong>The entity and ViewModel</strong></p> <p>I don't know if it's relevant, but here is the source class for the mapping:</p> <pre><code>public class BookcaseItem : Entity { public Guid Id { get; set; } public bool IsRenting { get; set; } public bool IsSwapping { get; set; } public bool IsSelling { get; set; } public decimal RentingPrice { get; set; } public decimal SellingPrice { get; set; } public string Currency { get; set; } public bool IsAvailable { get; set; } public virtual Guid BookId { get; set; } public virtual Guid UserId { get; set; } public virtual Book Book { get; set; } public virtual User User { get; set; } public BookcaseItem() { IsAvailable = true; Currency = "USD"; } } </code></pre> <p>And this is the destination class for the mapping:</p> <pre><code>public class FoundBookcaseItemViewModel { public Guid Id { get; set; } public bool IsRenting { get; set; } public bool IsSwapping { get; set; } public bool IsSelling { get; set; } public decimal RentingPrice { get; set; } public decimal SellingPrice { get; set; } public string Title { get; set; } public string Authors { get; set; } public string Identifiers { get; set; } public int Pages { get; set; } public string ImageUri { get; set; } } </code></pre>
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