Automapper missing type map configuration or unsupported mapping - Error

Question

Entity Model public partial class Categoies       public Categoies                 this Posts   new HashSet lt Posts gt                public int Id   get  set        public string Name   get  set        public string Description   get  set        public Nullable lt int gt  PositionId   get  set         public virtual CategoryPositions CategoryPositions   get  set        public virtual ICollection lt Posts gt  Posts   get  set       View Model public class CategoriesViewModel       public int Id   get  set          Required ErrorMessage    quot  0  alani bos birakilmamalidir  quot         Display Name    quot Kategori Adi quot        public string Name   get  set          Display Name    quot Kategori A  iklama quot        public string Description   get  set          Display Name    quot Kategori Pozisyon quot         Required ErrorMessage  quot  0  alani bos birakilmamalidir  quot        public int PositionId   get  set       CreateMap Mapper CreateMap lt CategoriesViewModel  Categoies gt                 ForMember c   gt  c CategoryPositions  option   gt  option Ignore                 ForMember c   gt  c Posts  option   gt  option Ignore      Map  HttpPost  public ActionResult  EditCategory CategoriesViewModel viewModel        using  NewsCMSEntities entity   new NewsCMSEntities                  if  ModelState IsValid                        try                               category   entity Categoies Find viewModel Id                   AutoMapper Mapper Map lt CategoriesViewModel  Categoies gt  viewModel  category                     category   AutoMapper Mapper Map lt CategoriesViewModel  Categoies gt  viewModel                     AutoMapper Mapper Map viewModel  category                   entity SaveChanges                        Veritabani islemleri basarili ise y  nlendirilecek sayfayi                     belirleyip ajax-post-success fonksiyonuna g  nder                  return Json new   url   Url Action  quot Index quot                                 catch  Exception ex                                                     Veritabani islemleri basarisiz ise modeli tekrar g  nder          ViewBag Positions   new SelectList entity CategoryPositions ToList     quot Id quot    quot Name quot            return PartialView viewModel            Error  Missing type map configuration or unsupported mapping  Mapping types  CategoriesViewModel - gt  Categoies 7314E98C41152985A4218174DDDF658046BC82AB0ED9E1F0440514D79052F84D NewsCMS Areas Admin Models CategoriesViewModel - gt  System Data Entity DynamicProxies Categoies 7314E98C41152985A4218174DDDF658046BC82AB0ED9E1F0440514D79052F84D Destination path  Categoies 7314E98C41152985A4218174DDDF658046BC82AB0ED9E1F0440514D79052F84D Source value  NewsCMS Areas Admin Models CategoriesViewModel  What am I missing  I try to find  but I cant see problem  UPDATE I have specified in application start in Global asax protected void Application Start         InitializeAutoMapper Initialize       InitializeClass public static class InitializeAutoMapper       public static void Initialize                 CreateModelsToViewModels            CreateViewModelsToModels               private static void CreateModelsToViewModels                 Mapper CreateMap lt Categoies  CategoriesViewModel gt                private static void CreateViewModelsToModels                 Mapper CreateMap lt CategoriesViewModel  Categoies gt                 ForMember c   gt  c CategoryPositions  option   gt  option Ignore                 ForMember c   gt  c Posts  option   gt  option Ignore

User · Answer

Where have you specified the mapping code (CreateMap)? Reference: Where do I configure AutoMapper?

If you're using the static Mapper method, configuration should only happen once per AppDomain. That means the best place to put the configuration code is in application startup, such as the Global.asax file for ASP.NET applications.

If the configuration isn't registered before calling the Map method, you will receive Missing type map configuration or unsupported mapping.

User · Answer

In my case  I had created the map  but was missing the ReverseMap function  Adding it got rid of the error        private static void RegisterServices ContainerBuilder bldr                   var config   new MapperConfiguration cfg   gt                         cfg AddProfile new CampMappingProfile                                                public CampMappingProfile                    CreateMap lt Talk  TalkModel gt    ReverseMap

User · Answer

In your class AutoMapper profile  you need to create a map for your entity and viewmodel   ViewModel To Domain Model Mappings   This is usually in AutoMapper DomainToViewModelMappingProfile  In Configure    add a line like  Mapper CreateMap lt YourEntityViewModel  YourEntity gt       Domain Model To ViewModel Mappings   In ViewModelToDomainMappingProfile  add   Mapper CreateMap lt YourEntity  YourEntityViewModel gt         Gist example

User · Answer

Notice the Categoies 7314E98C41152985A4218174DDDF658046BC82AB0ED9E1F0440514D79052F84D class in the exception  That s an Entity Framework proxy  I would recommend you disposing of your EF context to ensure that all your objects are eagerly loaded from the database and no such proxies exist    HttpPost  public ActionResult  EditCategory CategoriesViewModel viewModel        Categoies category   null      using  var ctx   new MyentityFrameworkContext                  category   ctx Categoies Find viewModel Id             AutoMapper Mapper Map lt CategoriesViewModel  Categoies gt  viewModel  category         category   AutoMapper Mapper Map lt CategoriesViewModel  Categoies gt  viewModel  category       entity SaveChanges        If the entity retrieval is performed inside a data access layer  which of course is the correct way  make sure you dispose your EF context before returning instances from your DAL

User · Answer

I was trying to map an IEnumerable to an object  This is way I got this error  Maybe it helps

User · Answer

I created a new AutomapperProfile class   It extends Profile   We have over 100 projects in our solution   Many projects have an AutomapperProfile class  but this one was new to this existing project   However  I did find what I had to do to fix this issue for us   There is a Binding project   Within the Initialization there is this code   var mappingConfig   new List lt Action lt IConfiguration gt  gt         Initialize the Automapper Configuration for all Known Assemblies mappingConfig AddRange  new List lt Action lt IConfiguration gt  gt       ConfigureProfilesInAssemblyOfType lt Application Administration AutomapperProfile gt              I had to add     ConfigureProfilesInAssemblyOfType lt MyNewNamespace AutomapperProfile   Note that ConfigureProfilesInAssemblyOfType looks like this       private static void ConfigureProfilesInAssemblyOfType lt T gt   IConfiguration configuration                 var log   LogProvider Get  typeof  AutomapperConfiguration                 The Automapper Profile Type         var automapperProfileType   typeof  Profile               The Assembly containing the type         var assembly   typeof  T  Assembly          log Debug   Scanning     assembly FullName                Configure any Profile classes found in the assembly containing the type          assembly GetTypes                Where  automapperProfileType IsAssignableFrom   ToList                ForEach  x   gt                                log Debug   Adding Profile      x FullName                          configuration AddProfile  Activator CreateInstance  x   as Profile                             Best regards  -Jeff

User · Answer

I did this to remove the error   Mapper CreateMap lt FacebookUser  ProspectModel gt     prospect   Mapper Map prospectFromDb  prospect

User · Answer

I had same issue in  Net Core  Because my base dto class i give it as a  type in startup for automapper assembly  was in different project  Automapper tried to search for profiles in base class project  But my dto s were in different project  I moved my base class  And problem solved  This may help for some persons

User · Answer

Upgrade Automapper to version 6 2 2  It helped me

User · Answer

Check your Global asax cs file and be sure that this line be there   AutoMapperConfig Configure

User · Answer

I know this is a rather old question as of now  but I had found the proper solution was that I was not declaring the assembly attribute   My code is   using AutoMapper       namespace       Controllers       public class HousingTenureTypesController   LookupController lt HousingTenureType  LookupTypeModel gt                Mapper CreateMap lt HousingTenureType  LookupTypeModel gt    ReverseMap                      This was fixed by adding the following line before my namespace declaration    assembly  WebActivatorEx PreApplicationStartMethod typeof HousingTenureTypesController    AutoMapperStart      The full code is   using AutoMapper        assembly  WebActivatorEx PreApplicationStartMethod typeof HousingTenureTypesController    AutoMapperStart     namespace       Controllers       public class HousingTenureTypesController   LookupController lt HousingTenureType  LookupTypeModel gt                Mapper CreateMap lt HousingTenureType  LookupTypeModel gt    ReverseMap

User · Answer

I found the solution  Thanks all for reply   category    Categoies AutoMapper Mapper Map viewModel  category  typeof CategoriesViewModel   typeof Categoies      But  I have already dont know the reason  I cant understand fully

[asp.net-mvc] Automapper missing type map configuration or unsupported mapping - Error

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