Ignore mapping one property with Automapper

Question

I m using Automapper and I have the following scenario  Class OrderModel has a property called  ProductName  that isn t in the database  So when I try to do the mapping with   Mapper CreateMap lt OrderModel  Orders gt        It generates an exception     The following 1 properties on Project ViewModels OrderModel are not mapped   ProductName   I ve read at AutoMapper s Wiki for Projections the opposite case  the extra attribute is on the destination  not in the source which is actually my case    How can I avoid automapper to make the mapping of this property

User · Answer

You can do this  conf CreateMap lt SourceType  DestinationType gt        ForSourceMember x   gt  x SourceProperty  y   gt  y Ignore      Or  in latest version of Automapper  you simply want to tell Automapper to not validate the field conf CreateMap lt SourceType  DestinationType gt        ForSourceMember x   gt  x SourceProperty  y   gt  y DoNotValidate

User · Answer

From Jimmy Bogard   CreateMap lt Foo  Bar gt    ForMember x   gt  x Blarg  opt   gt  opt Ignore      It s in one of the comments at his blog

User · Answer

Could use IgnoreAttribute on the property which needs to be ignored

User · Answer

There is now  AutoMapper 2 0  an IgnoreMap attribute  which I m going to use rather than the fluent syntax which is a bit heavy IMHO

User · Answer

When mapping a view model back to a domain model  it can be much cleaner to simply validate the source member list rather than the destination member list  Mapper CreateMap lt OrderModel  Orders gt  MemberList Source      Now my mapping validation doesn t fail  requiring another Ignore    every time I add a property to my domain class

User · Answer

I m perhaps a bit of a perfectionist  I don t really like the ForMember      x    x Ignore    syntax  It s a little thing  but it it matters to me  I wrote this extension method to make it a bit nicer   public static IMappingExpression lt TSource  TDestination gt  Ignore lt TSource  TDestination gt       this IMappingExpression lt TSource  TDestination gt  map      Expression lt Func lt TDestination  object gt  gt  selector        map ForMember selector  config   gt  config Ignore         return map      It can be used like so   Mapper CreateMap lt JsonRecord  DatabaseRecord gt             Ignore record   gt  record Field           Ignore record   gt  record AnotherField           Ignore record   gt  record Etc     You could also rewrite it to work with params  but I don t like the look of a method with loads of lambdas

User · Answer

Just for anyone trying to do this automatically  you can use that extension method to ignore non existing properties on the destination type     public static IMappingExpression lt TSource  TDestination gt  IgnoreAllNonExisting lt TSource  TDestination gt  this IMappingExpression lt TSource  TDestination gt  expression        var sourceType   typeof TSource       var destinationType   typeof TDestination       var existingMaps   Mapper GetAllTypeMaps   First x   gt  x SourceType Equals sourceType           amp  amp  x DestinationType Equals destinationType        foreach  var property in existingMaps GetUnmappedPropertyNames                  expression ForMember property  opt   gt  opt Ignore               return expression      to be used as follow     Mapper CreateMap lt SourceType  DestinationType gt    IgnoreAllNonExisting      thanks to Can Gencer for the tip       source    http   cangencer wordpress com 2011 06 08 auto-ignore-non-existing-properties-with-automapper

User · Answer

Hello All Please Use this it s working fine    for auto mapper use multiple  ForMember in C             if  promotionCode Any                          Mapper Reset                Mapper CreateMap lt PromotionCode  PromotionCodeEntity gt    ForMember d   gt  d serverTime  o   gt  o MapFrom s   gt  s promotionCodeId    null    date    String Format   0 dd MM yyyy h mm ss tt    DateTime UtcNow AddHours 7 0                      ForMember d   gt  d day  p   gt  p MapFrom s   gt  s code         LeftTime Convert ToInt32 s quantity   Convert ToString s expiryDate   Convert ToString DateTime UtcNow AddHours 7 0       Day                     ForMember d   gt  d subCategoryname  o   gt  o MapFrom s   gt  s subCategoryId    0        Convert ToString subCategory Where z   gt  z subCategoryId Equals s subCategoryId   FirstOrDefault   subCategoryName                     ForMember d   gt  d optionalCategoryName  o   gt  o MapFrom s   gt  s optCategoryId    0        Convert ToString optionalCategory Where z   gt  z optCategoryId Equals s optCategoryId   FirstOrDefault   optCategoryName                     ForMember d   gt  d logoImg  o   gt  o MapFrom s   gt  s vendorId    0        Convert ToString vendorImg Where z   gt  z vendorId Equals s vendorId   FirstOrDefault   logoImg                     ForMember d   gt  d expiryDate  o   gt  o MapFrom s   gt  s expiryDate    null        String Format   0 dd MM yyyy h mm ss tt    s expiryDate                  var userPromotionModel   Mapper Map lt List lt PromotionCode gt   List lt PromotionCodeEntity gt  gt  promotionCode               return userPromotionModel                    return null

[c#] Ignore mapping one property with Automapper

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