Automapper constructusing To instruct AutoMapper to recognize members with other visibilities, override the default filters ShouldMapField and/or ShouldMapProperty : In the AutoMapper library, you can configure the construction or instantiation of objects using a TypeFactory. CreateMap(mySource, myTarget). Categories, option => option. ForAllOtherMembers(x=>x. We use AutoMapper to map from Entities (NHibernate) to DTO's and bac You can absolutely do exactly what you want using a custom ITypeConverter<TSource, TDestination> implementation. DisableCtorValidation(). ForAllMembers(opt => opt. then you can use ConstructUsing like this. But as soon the source value is null, the entire destination property (dest. Hot Network Questions How to prevent Safari 18 from forcing HSTS policy for subdomains for development purposes? So what happens here is that you initialize Automapper in a non-static way (isn't clear from your original post, but I could deduct that because my comment seemed to have solved your problem), but you are using Automapper statically within the ConstructUsing method. Some other approach maybe? This is because AutoMapper is finding this CableIDDTO constructor: public CableIDDTO(string panelID1, string panelID2, int sequenceNo) and calling it, setting sequenceNo. Reflection. net core project and it's my first time with that library. Load 7 more related questions Show fewer related questions AutoMapper 8. IMappingExpression`2<!0,!1> AutoMapper. AutoMapper requiring mapping members and constructor. service) 3) Pass paramether directly - same like 2, but u can get it from IoC container if u have it, for example . The 5. NewWindow)); var We are using Automapper to map DTOs to entities. This can be used in situations like the following where we are trying to map from an int to an unsigned int. To map Objects that need Constructor Parameters using Automapper you need to use the ConstructUsing Method while Creating the Map. Had the same issue after adding AutoMapper to another project. CreateMap<TypeA, TypeB>(). Modified 5 years, 1 month ago. ConstructUsing() method. To map lists of objects I want the mappings to set the context themselves. Existing ConstructUsing usages . Jimmy said: However, you CAN use ConstructUsing to build out the initial destination object. ctor(MapperConfigurationExpression AutoMapper can map to destination constructors based on source members: public class Source {public int Value {get; set;}} public class SourceDto {public SourceDto (int value) {_value = value;} private int _value; public int Value {get {return _value;}}} var configuration = new MapperConfiguration (cfg => cfg. To CreateMap<SourceRecord, Record>() . To make sure that the created entity is always bound to the session (we use NHibernate), we have the following in the Automapper configuration: var I am using automapper in my asp. CreateMap<TSource, TDestination>(). Related. I would instead do something like: AutoMapper. ForMember() in case a property mismatches. 0 ConstructUsing breaking change. 0). It’s not going to do it. Once you have your types, and a reference to AutoMapper, you can create a map for the two types. Use the JObject. OpenInNewWindow,map=>map. The destination type's design can be influenced by the layer in which it lives, but AutoMapper works best as long as the names of the members match up to the source type's members. MapFrom<PropertyResolver>) . 0, AddAutoMapper is part of the core package and the DI package is discontinued. Starting with version 13. 2 and the AutoMapper. It should be singleton because constructing it is quite heavy. Existing ConstructUsing usages The change from Func to Expression may break some existing usages. Improve this answer. If I have a CustomerResource object, for example, and want to map it into Customer (domain object), I have to instantiate it: CreateMap<CustomerResource, Customer>(). I have a CreateMap: CreateMap<ExtractInsertRequestViewModel, Extract>() . You will most likely have to find a different solution rather than using AutoMapper. If you have a source member called "FirstName", this will automatically be I've got the following mapping working with for key value pairs based on construct using: Mapper. CreateMap<OpenName, RestrictedName>() . 10. AutoMapper v11. ConstructUsing and telling AutoMapper to use the no-args constructor:. AutoMapping Object with Constructor Arguments. That going to be good as it will hide this away from consumers of I think that will have to be done outside the mapping. IsEnabled. ResolutionContext>)'. So automapper needs to know that A maps to B, CA maps to CB, and when creating a B populate it's MyI prop with a CB, how do I specify this mapping? automapper; . In your case you are returning a Child2 object with the Id value set to 2 (as returned by the ctx. I have a custom value resolver to populate the SelectList property items from the db, but am wondering if there's a way to pass a couple values from Therefore, AutoMapper will use this method as the source for EngineInfo. 0, ResovleUsing was replaced by MapFrom. Product)) . Or a custom AfterMap, that's also inherited. g. You switched accounts on another tab or window. The reason for this is that I can then easily use the language as key to get the available parameters/options for that language. ConstructUsing()` and manually map every property into the constructor? I am using automapper to map from model to dto. Hot Network Questions Nginx: SNI wildcard routing for subdomain, but also proxy+terminate others (2025) Japan eSIM or physical SIM 2-3 weeks "Da" vs "a" in a sentence This instruct AutoMapper to check for the option ConstructServicesUsing method that can be provided during the mapping instruction. CreateMap<Source, Dest>() . If you’re not interested in upgrading to 9. IMappingExpression`2. This is particularly useful when dealing with interfaces or any objects that cannot be instantiated directly. Namely: ConstructUsing using lambda statements, method groups, or How to use Mapper. CreateMap<SourceClass, DestinationClass>() . GetInstance)); It is used to configure AutoMapper to use certain constructor to instantiate a class. x version includes a context object you can use just like you're trying to do. 2) I'm trying to map a nullable boolean to a destinations object property (dest. Map < ContestEditableViewModel, Model. I'm not exactly sure how or why it's doing that--i'll continue to dig. ConstructUsing(s => new RestrictedName(s. It is using reflection for creating objects. DataXXX)). I have problems using ConstructUsing. You define the configuration using profiles. Hot Network Questions Not a Single Solution! How heavy was the fish, really? How to use local SOLR zip file during Sitecore installation? How do I make my lamp glow like the attached image You need to tell AutoMapper that you don't intend to have it construct the destination type by calling CreateMap<TSource, TDest>(). public class XProfile : AutoMapper. Initialize(cfg => { // Adding "Construct" configuration cfg. AutoMapperMappingException : Trying to map System. answered Oct 18, 2013 at 23:11 Note that the difference between ConvertUsing and ConstructUsing is that ConvertUsing is invoking the method you provided and exits the conversion procedure while ConstructUsing only instantiates the object and continues execution on the rest of the mapping rules. However, it fails to consider custom mapped members in its constructor resolution process. The data flow is as follows: Model->DomainModel->ViewModel. Then you can make the mapping with the ConstructUsing method, to tell AutoMapper to call the constructor that you created. The ICollection<TblParameters> only contains entries with the same id. This method requires a parameter. Generic; namespace ConsoleAppMapper { class Program { static void Main(string[] args) { var mapper = new MapperConfiguration(cfg => { cfg. Map with ConstructUsing and AutoMapper? 1. This doesn't work (the (DstParent)resolutionContext. If your ORM exposes IQueryable s, you can use AutoMapper’s You can configure which constructors are considered for the destination object: AutoMapper allows now (I am not sure, since when) to map properties with private setters. 1 to now use AutoMapper v2. 2 of Automapper it's deprecated to use static method Mapper. ---> System. Map<TypeB>(instanceOfA); // instanceOfB. Reload to refresh your session. ProfileMap. If AutoMapper can't find either a matching property name or method name for a particular destination property, it will look for a method on the source class called "GetXXX" where "XXX" is the name of the destination property. Namely: ConstructUsing using lambda statements, method groups, or According to the AutoMapper Documentation, I should be able to create and use an instance of a Custom Type Converter using this:. Here is an example that reproduces this. In doing so ResolveUsing was consolidated with MapFrom. DataYYY)); As i have quite a lot of mappers to do i have split them within Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog After upgrading to AutoMapper 8 my custom converters are ignored. Property1 will be "Some This generates Automapper's interface proxy class types but I think it should create ImplementedClass 's instance. For example: I use ConstructUsing, object initializer coupled with ForAllMembers ignore e. The text was updated successfully, but these errors were encountered: Configure the IMyInterface AutoMapper. You can fix this by calling . This is my profile for the above at the moment For Automapper 5. CreateMap<Source, Destination>() . FromDateTime(x. CreateMap<SourceRecord, Record>() . How can I tell automapper to change behaviour in the SubType mapping based on the Event. Fesslersoft. However, after the object has been created, the default mapping will still be applied. Map<Child1, Child2>(src. While it is a nested child, I am using ForPath instead ForMember. To Queryable Extensions . Automapper map from one object to nested objects. To convert to string is easy, however to convert the string back to type I wrote a ValueConverter. Ignore()) work with the first suggestion? I am using ASP. The change from Func to Expression may break some existing usages. I am trying to map two entities with a many to many relationship that inherit from an abstract base class into Dtos that also inherit from their own abstract base class. See that the main Object the automapper does automatically without mapping the fields, but, when it comes to the Object Value Attributes I had to map one by one so it would understand where the information is sourced How can I tell automapper to change behaviour in the SubType mapping based on the Event. Everything was fine but we had one Problem. ConstructUsing((TypeA a) => new TypeB(_id)); TypeB instanceOfB = Mapper. Id value will be saved in Hello! I need to map simple source type to proxied generic. See the Sample Console Applications below. ConstructUsingServiceLocator(); }); Queryable Extensions . Since AutoMapper requires an instance to map to, setting the destination to null seems like it should go outside the mapping. Value) : null); AssertConfigurationIsValid will work without any problems, but if you use the mapping, you will get the following error: It looks like you're using an older version of AutoMapper. ConstructUsing(x=>new TDestination(x. CreateMap<MySourceType, MyDestinationType>(); I would like to have a constructor of MyDestinationType which have a MySourceType parameter, then automatically initialize properties of the type under creation with the source like this: I have an AutoMapper converter that takes a Nullable<bool>/bool? and returns a string. It can map to private setters, but will skip internal/private methods and properties if the entire property is private/internal. Mapping lists of objects with parameters. Map<ActualDestination>(s)); Also I want these mappings to use the full automapper goodness and be able to map lists of customer entities into list of customer DTOs. Map<CA, CB>) ; CreateMap<A, B>(); } } Share. Namely: ConstructUsing using lambda statements, method groups, or Queryable Extensions . Automapper 8 mapping not working properly. First we had the following mapper rule: Mapper. However, if this logic pertains only to the mapping operation, it would clutter our i am using automapper to map from dtos to domain and vice versa; i am using custom type converter to do the conversion but i want to inject dependencies into my converter class using simple inject With Automapper (6. Automapper ConstructUsing not working as expected. Engine. . I cannot get the simplest case on the AutoMapper website to work nor can I get the more advanced IMemberValueResolver case to The ConstructUsing expression-based method will be used for both in-memory mapping and LINQ projections. Microsoft. Now, my questions are: Can this be achieved with AutoMapper? If yes, can it be done with ContructUsing? I've also tried ConvertUsing, but I get the same result. Second, when you are using AutoMapper to map between classes, you must specify every parameters. 3. You have to think what it is a store of - in this case KeyValuePairs. Many times, this custom value resolution logic is domain logic that can go straight on our domain. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Register(IConfigurationProvider configurationProvider) at AutoMapper. TargetInvocationException: Exception has been thrown by the target of an invocation. At this moment Automapper gets confused. Extensions. Mapping object with AutoMapper. ConstructUsing(Mapper. Strings)); } } The ConstructUsing expression-based method will be used for both in-memory mapping and LINQ projections. Task<ICollection<Data>> to Task<ICollection<DataItem>>. 1 and I am coming across some issues that I never encountered using the previous version. MapFrom(q => q. But i don't know how? Re Automapper - Inheritance mapper not working with type converter. The exception said it was missing a map from . As per the method documentation: // Summary: // Disable constructor validation. Parent. You signed out in another tab or window. AfterMap(System. Add a comment | Your Answer Reminder: Answers generated by artificial intelligence tools are not allowed on Stack Overflow. ConstructServicesUsing(childContainer. As the mapping engine executes the mapping, it can use one of a variety of methods to resolve a destination member value. The mapped dictionary In my ASP. DependencyInjection library for Automapper - as well as a Profile class which i've just included in this example. Command and also part of CreateDeviceAppViewModel so what's going on here is that the AutoMapper is ignoring the ConstructUsing method because it just mapped all the properties (including 'Thumbnail' property). CreateProjection < If you need to convert object types from one to another, writing it by hand could be a pain, check out AutoMapper. Automapper is used for mapping between those. var config = new When mapping a collection property, if the source value is null AutoMapper will map the destination field to an empty collection rather than setting the destination value to null. Empty)) Note that you can use default values as arguments for the constructor's parameters, Automapper will still correctly map all other See that the main Object the automapper does automatically without mapping the fields, but, when it comes to the Object Value Attributes I had to map one by one so it would understand where the information is sourced and where the information the designated. Namely: ConstructUsing using lambda statements, method groups, or Automapper: Cannot create instance of abstract type for collections. Name)); is it possible for me to add the ability to use the method AddEmailAddresses with AutoMapper? I've tried CreateMap<NewPatient, Patient>() . SomeField)), than yes, the configuration for this mapping will be replaced with the new one. To migrate, replace all usages of ConstructProjectionUsing with ConstructUsing. 2 AutoMapper 8. Profile { protected override void Configure() { AutoMapper. Automapper v10 and AutoMapper. Action`3<!0,!1,AutoMapper. Profile After I configure one simple mapping for AutoMapper like: Mapper. Attributes>() . 0. constructUsing() is mandatory for interfaces and any object that cannot be instantiated directly due to the lack of a Although AutoMapper covers quite a few destination member mapping scenarios, there are the 1 to 5% of destination values that need a little help in resolving. Project (). Get<ISomeDependency>) Everything works with simple map (without ProjectTo), but with projection my sql looks like this (doesn't join with employees table) because of Func param, not Expression at ConstructUsing (I got 2 employees with nullable fields): You can use one of the ConstructUsing overloads to tell AutoMapper which constructor should it use. Existing ConvertUsing usages . MapperConfiguration. Can it be done ? – Egor. using AutoMapper; using System; using System. Type Wow that worked, but now I found another problem in my code, see I have a Nullable<MessageType> property in my Message class? That's an Enum, while I can send the string value for a value in my Enum and store the int value in the database, AutoMapper doesn't know how to convert that into the string representation, throwing the message LINQ to Entities Using ConstructUsing, AutoMapper didn't know that that call actually maps all of the properties and we can just ignore the property mappings that don't match. Empty)) Note that you can use default values as arguments for the constructor's parameters, Automapper will still correctly map all other Existing ConstructUsing usages¶ The change from Func to Expression may break some existing usages. ConstructUsing( f => new Target { PropVal1 = AutoMapper’s Solutions: ForCtorParam and ConstructUsing AutoMapper’s ForCtorParam method facilitates mapping class properties to record constructor parameters. Automapper Map Members in the nested class. This is typically when one type looks nothing like the other, a conversion function already exists, and you would like to go from a “looser” type to a stronger type, such as a source type of string to a destination type of Int32. 2. 0, where dynamic mapping was removed, you should stick with 8. ForMember(m=>m. Namely: You signed in with another tab or window. There's two solutions for this: 1) Use Automapper statically The problem is that AutoMapper configuration is usually singleton. ConstructUsing(source => new Extract(source. Regarding the second part of your question, I know the way to verify if the map was Nested Mappings . AssertConfigurationIsValid, it complains that there is no mapping (rule) for the member IsDeleted in the (class) mapping rule from MyObject to MyFlatObject. When invoking Map, you can configure the conversion context with your custom parameter(s) using the second callback argument. I need to map to a protected property on a class using Automapper. What I get is a loop in ConstructUsing, until I get stack overflow. Automapper: Missing type map configuration or unsupported mapping. It doesn't feel right to put it in the ApplicationFacade even though it's job is orchestration. See the Sample Console Applications This article focuses on leveraging AutoMapper for mapping classes to records, a common scenario in modern . One option I though of: The ConstructUsing expression-based method will be used for both in-memory mapping and LINQ projections. Learn more. CreateMap Now I want to use AutoMapper to map an ICollection<TblParameters> into a Dictionary<string, Dictionary<int, string>>. DependencyIn v8. second, ctxt. Map is used only to determine what type the return value should be, and is not actually modified. Attributes, ResponseDTO. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The ConstructUsing expression-based method will be used for both in-memory mapping and LINQ projections. If your ORM exposes IQueryable s, you can use AutoMapper’s at AutoMapper. I can configure all i need, but stuck on how to combine open generic and custom construct. ConstructServicesUsing(t => new Dest(5)); // Tell AutoMapper to use already defined configuration to construct Dest class cfg. QueryableExtensions namespace): var dst = src. I've got a public method exposed on this class that is used to set values to the property. 6. Value). DestinationValue is null), but maybe I'm completely missing a Dependency Injection . For flattening, you can use IncludeMembers. If your ORM exposes IQueryable s, you can use AutoMapper’s I have two classes like so: public class SentEmailAttachment : ISentEmailAttachment { public SentEmailAttachment(); public string FileName { get; set; } public string ID { get; set; } SomeContructorParam emptyParm = null CreateMap<SomeEntity, SomeModel>() . You can’t inject dependencies into Profile classes, but you can do it in IMappingAction implementations. 0 the API of AutoMapper has been changed. Namely: ConstructUsing using lambda statements, method groups, or The ConstructUsing expression-based method will be used for both in-memory mapping and LINQ projections. Custom Type Converters . The basic . Automapper using constructor with default parameters. ConstructUsing(source => new PersonViewModel(source. ConstructUsing and telling AutoMapper to use the no-args constructor: How can I tell automapper to change behaviour in the SubType mapping based on the Event. Options. 1. CreateMap<MenuTable, Menu>(). Hot Network Questions If every denomination is skeptical of every other denomination, why shouldn't non-Christian outside observers be skeptical of The documentation is very sketchy on the AutoMapper website. Child1) line). This aligns with the behavior of Entity Framework and Framework Design Guidelines that believe C# references, arrays, lists, collections, dictionaries and The ConstructUsing expression-based method will be used for both in-memory mapping and LINQ projections. updgrate guide – Liang. AutomapperConstructorTest { class Program { static void Main(string[] args) { CreateMap<NewPatient, Patient>() . I have found the ConstructUsing method, but that requires me to specify the parameter value at time of configuration. AutoMapper allows you to add conditions to properties that must be met before that property will be mapped. YYY = Mapper. Pass additional object to CreateMap. After it constructs the object it continues mapping as usual. System. But everything I have tried is failing or I can only create new instances of the parent object (using ConstructUsing), not map the one in the constructor. Mapper. CreateMap<Source, Target>() . Entities. One of these methods is to use another type map, where the source member type and destination member type are also configured in the mapping configuration. This means that the Parent. 0 in order to skip all unmapped properties you just need put. If you try create a mapper for the KeyValuePair combination you will quickly work out that you can't directly as the Key property doesn't have a setter. AutoMapper using the wrong constructor. Using a ValueConverter in combination with ForMember is working DateOnly?>(). Automapper - Mapping from source child object to destination is including parent values. From config. var dest = Mapper. Which kinda defeats the point of using Automapper. Collections. Automapper create map method. So my question is How can I map to a class, with read only properties, using Automapper; without having to use . MemberId, source. Why don't the properties from my subclasses We used AutoMapper since years now and were very happy with it. Part of the data profile class: Trying to get Necromancer badge. Regarding the second part of your question, I know the way to verify if the map was I am already using automapper for the 1st way (JSON to SomeDto), it involves many properties and custom resolvers. TypeA instanceOfA = new TypeA() { Property1 = "Some string" }; _id = 3; Mapper. Provide Existing ConstructUsing usages¶ The change from Func to Expression may break some existing usages. Categories)); ConstructUsing() is used to generate and populate the How to use Mapper. public AutoMapper() { CreateMap<RequestDTO. If AutoMapper can't find either a matching property name or method name for a particular destination property, it will look for a I am using automapper in my asp. removing the EventType and creating subclasses ) Unfortunately I inherited this code and just need to resolve bugs without spending to much time. Commented Jul 25, 2019 at 7:18. ConstructUsing(source => new PersonViewModel(_kernel. Map with ConstructUsing and AutoMapper? 3 Automapper - Inheritance mapper not working with Construct. Map with ConstructUsing and AutoMapper? 2. ConstructUsing(cr => ) In my case, there is no public Customer-constructor. 8. 2) Say mapper take paramether from sorce - . ConstructUsing((src, ctxt) => new Dest(src. CreateMap<Task<List<Data>>, Task<List<DataItem>>>(); AutoMapper 8. Identity 3. IDataRecord to ConstructUsing. Is there any way of creating the mappings without the ConstructUsing clause? I thought that having the more specific version of CreateMap would have taken care of this for us, but if I don't have the ConstructUsing clause, AutoMapper tells me "Instances of abstract classes cannot be created". Namely: ConstructUsing using lambda statements, method groups, or delegates; Dual configuration of ConstructProjectionUsing and ConstructUsing; For the first case, you may either: Convert to a lambda expression; Move to the Func-based overload AutoMapper 8. The view model has a SelectList property for a drop down in the view. I found the best solution for me is to rollback the Automapper version to 9 and the DI respectively. Ignore()); at the end of your profile. ; In the Convert method of your customer type converter, you can recover your parameter(s) from the How to use Mapper. ConstructUsing(myConverter); This piece of code does not build with AutoMapper 8, because I have to use expressions. NET MVC 2 (RC) project - I'm using AutoMapper to map between a Linq to Sql class (Media) and a view model (MediaVM). CreateMap<ProductWithCategories, ProductViewModel>() . Take a look at the corresponding pull request for further information. Note: My solution without ConstructUsing. KeyValuePair<,> objects can be mapped by Automapper as long as the Key and Value objects themselves can be mapped: See the sample/fiddle The only mapping that could be usefull is a cfg. The ConvertUsing expression-based method will be used for both in-memory mapping and LINQ projections. The ConstructUsing expression-based method will be used for both in-memory mapping and LINQ ConstructUsing. Did adding . AutoMapper gets around this though by If Automapper can't create an instance of the destination using a default constructor, you can give Automapper a function that calls a constructor and returns the new instance with ConstructUsing. There is a NuGet package to be used with the default injection mechanism described here and used in this project. For example here's a source and destination class. Collections in this case doesn't requires any additional logic/mapping configurations. If your destination type has a custom constructor but you don’t want to override the entire mapping, use the ConstructUsing expression-based method overload: cfg . NET Core but when I inject service in the constructor it does not work. AutoMapperMappingException' was thrown. CreateMap<KeyValuePair<MenuTable, List This is because AutoMapper is finding this CableIDDTO constructor: public CableIDDTO(string panelID1, string panelID2, int sequenceNo) and calling it, setting sequenceNo. Base members don't get mapped. CreateMap(); This worked until the web api method became full async. Property,config=>config. Data. first, src. AutoMapper can map to destination constructors based on source members: If the destination constructor parameter names don’t match, you can modify them at config time: This works for From version 4. ConstructUsing(dest => new Patient(dest. Name)); which works with this code. How can I map a value to this class? Destination Class: public class Policy { private Billing _billing; protected Billing Billing { get { return _billing; } set { _billing = value; } } Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company AutoMapper relies on property setters to do its work, so if you have read-only properties, AutoMapper won't be of much use. Dependency Injection Examples ASP. This works great in the application, but in the test the configuration is not valid for AutoMapper. 28. 1 Automapper not invoking constructor. Initialize(cfg => { cfg. 1. The mapper was changed to. You could override the mapping behaviour and, for example, configure it to invoke a specific constructor, but that basically defeats the purpose of AutoMapper because then you are doing the mapping manually, and you've only succeeded in adding a AutoMapper is able to use construct Destination objects using the constructor and simple name resolution as in #361. The following example shows how to connect an IMappingAction accessing the current HttpContext to a Profile after map action, leveraging dependency injection: How do I use AutoMapper? First, you need both a source and destination type to work with. – To migrate, replace all usages of ConstructProjectionUsing with ConstructUsing. Sample Console Application C# using System; using AutoMapper; namespace de. Call constructUsing() and pass in a DestinationConstructor to customize how AutoMapper should construct the Destination before every map operation To map Objects that need Constructor Parameters using Automapper you need to use the ConstructUsing Method while Creating the Map. ForMember( Existing ConstructUsing usages¶ The change from Func to Expression may break some existing usages. During mapping this map is used // against an existing destination object and never constructed itself As I now need to manually map every property, in the correct order, in the . By default, AutoMapper only recognizes public members. MissingMethodException: Method not found: 'AutoMapper. I apply this globally to my profile, and it works for true and false but not for null. When using an ORM such as NHibernate or Entity Framework with AutoMapper’s standard mapper. Nowadays this task can be solved much easier with using ConstructUsing function specifc fields should be filled in the provided action, but all the common fields will go to ForMember execution of the mapping. Mapper. ConstructUsing(s => Mapper. Add a comment | 1 Answer Sorted by: Reset to default -1 . I would like to keep the mapping logic for the other way using the same concept. 1 not mapping properties when destination class has constructor I make use of ConstructUsing but it goes on Stack Overflow Exception since it has a recursion on base type mapping rule. Hot Network Questions Why Gaussian Process Regression (GPR) is non-parametric? In order to get AutoMapper to use Windsor to create the target type, you need to configure two things: Tell AutoMapper to construct services using Windsor; Tell AutoMapper (per-mapping) to actually use the above configuration AutoMapper with ConstructUsing to map child properties not valid in test, but works in production. You cannot have separate configuration for in-memory vs. To construct proxy i need to know requested destination type. Contest. NET Core . There's a good getting started on the project's wiki . From what I can tell, the second parameter in Mapper. Here is an AutoMapper 8. Is there a way to do the mapping using Automapper. Here is what I have in my AutoMapper profile: CreateMap<bool?, string>() . See that the main Object the automapper does automatically without mapping the fields, but, when it comes to the Object Value Attributes I had to map one by one so it would understand where the information is sourced If I don't put Automapper in the Domain/BLL layer, I'm not really sure where it should go. cfg. CreateMap<Order, OrderDto>(); The type on the left is the source type, and the type on the right is the destination type. If you were relying on this, your app will no longer work by default. It turns out this tracking is very expensive, and you need to opt-in using PreserveReferences for circular maps to work. CylinderCount. MapFrom(s=>s. MyClass. ForMember(x=>x. Map functions, you may notice that the ORM will query all the fields of all the objects within a graph when AutoMapper is attempting to map the results to a destination type. ConstructUsing(x => new DestinationClass(x. You can apply Ignore() as there is no mapping from the source and thus it will not complain. To map these I use ConstructUsing, a solution from another stack overflow post. This is because it allows you to perform dynamic mapping based on an existing object whose type is only known at runtime instead of hard-coding a type in the generics. without luck. Now I'm trying to do what @jimmy-bogard said in his answer, but unfortunately still with no success. It seems to me it is not working. Net Core 2. Part of the data profile class: Conditional Mapping . Automapper - not mapping. ConstructUsing((Source s) => AutoMapper. Contest > (viewModel The main part here is the AutoMapper configuration where I am trying to extract reference to the produced DstParent from mapping context. And then use the ConstructUsing option in the Source, Destination mapping to do the translation from the Source to the ActualDestination: AutoMapper. ConstructUsing(src => new SomeModel(emptyParm)); Projecting. AfterMap((s, d) => d. AutoMapper also supports Flattening, which can get rid of all those pesky null reference exceptions you might encounter along the way. Items["Id"])); Today I upgraded a fully functioning application using AutoMapper v1. So you should use ConstructUsing() with ResolutionContext and call ResolutionContext. ConstructUsing(source=> new Record(string. And then you let AutoMapper know in what assemblies are those Queryable Extensions . ConstructUsing(x => x. But the username in the request is not singleton-scope. Namely: ConstructUsing using lambda statements, method groups, or delegates; Dual configuration of ConstructProjectionUsing and ConstructUsing; For the first case, you may either: Convert to a lambda expression; Move to the Func-based overload Therefore, AutoMapper will use this method as the source for EngineInfo. If your ORM exposes IQueryable s, you can use AutoMapper’s I need to use a service layer in the AutoMapper profile class in ASP. MyClass Exception of type 'AutoMapper. var model = AutoMapper. HasValue ? DateOnly. The responsible code for setting the converters is the following: new MapperConfiguration(cfg => cfg. Namely: ConstructUsing using lambda statements, method groups, or AutoMapper 9. LINQ projections. Ask Question Asked 5 years, 2 months ago. Map<Source, Destination>(new Source { Value = 15 }, opt => opt. Namely: ConstructUsing using lambda statements, method groups, or To migrate, replace all usages of ProjectUsing with ConvertUsing. Previously, AutoMapper could handle circular references by keeping track of what was mapped, and on every mapping, check a local hashtable of source/destination objects to see if the item was already mapped. A simple example is the follo I'm using AutoMapper to map objects in domain and API resources. AutoMapper no longer creates maps automatically by default CreateMissingTypeMaps was deprecated and its default value changed to false. EventType? PS> I know this is bad design and it really should be resolved by refactoring the whole thing ( eg. I was using the same versions. How can I map a List&lt;string&gt; to List&lt;Class&gt;? Usecase: from the Webservice I'm getting a class with a list of string but in my MVC Viewmodel, I want to have Class instead with a single Im trying to get automapper to map the parent object within the parameter of ViewModelB and Model B. (in AutoMapper. In my model I want to use a string where in my dto I use an Enum. How can I make Automapper choose parameterless constructor. For example: public class UserProfile : Profile { private readonly IUserManager _userManager; public UserProfile(IUserManager userManager) { _userManager = userManager; CreateMap<User, UserViewModel>() ConstructUsing() is used to create the destination object, where the value should be stored in. Seal() at AutoMapper. Commented Jun 13, 2017 at 18:47. I would prefer to do it at time of Mapping to avoid needing to create a separate MappingEngine for every instance of the parameter. The ConstructUsing expression-based method will be used for both in-memory mapping and LINQ projections. Map(s. Empty)) Note that you can use default values as arguments for the constructor's parameters, Automapper will still correctly map all other From automapper 8. Using mapping configuration for System. Viewed 5k times 6 . It definitely doesn't feel right to put it in the Domain/BLL layer because I Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company If you set the overrides for IMappingExpression like this Mapper. IsChargeBack, source. Map(). NET applications, with a special emphasis on the ForCtorParam and ConstructUsing In your MapperConfiguration, you can use the constructUsing() method to specify the TypeFactory for a particular mapping. The problem you are having is because AutoMapper is struggling to map the contents of the Dictionary. 0. The second test AutoMapper_ConstructUsing_Test_IsValid will fail, while the other two will complete successfully. FromObject static factory method within your CreateMap<SourceRecord, Record>() . As of version 8. Name)) Is it possible with AutoMapper? I have tried this and I was not surprised when it failed: config. @alsami thank u for your response but I think that I have found where's the problem, the Thumbnail property is part of CreateDeviceApp. CreateMap<UrlPickerState, Link>() . ForMember(q => q, option => option. ForMember(q => q. Sometimes, you need to take complete control over the conversion of one type to another. ConvertUsing<NullableBoolToLabel>(); And here is the converter class: So options is: 1) Use constructor without parameters. Namely: ConstructUsing using lambda statements, method groups, or delegates; Dual configuration of ConstructProjectionUsing and ConstructUsing; For the first case, you may either: Convert to a lambda expression; Move to the Func-based overload If you set the overrides for IMappingExpression like this Mapper. Some time ago we updated it from a very old version (2. Follow edited Oct 21, 2013 at 10:51. ifvcli nobsywr hdscvo kotz bkxo hcg rabudd luexh dvuvy zhdstx