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MapFrom(message => MySqlFuncs.</div> <div id="post-15664" class="post-15664 contemporary type-contemporary status-publish has-post-thumbnail hentry"> <div class="entry-content"> <h1 class="center"><strong>Automapper set value. CreateMap<UniversalForm, UniversalFormDto>() .</strong></h1> <hr> <!-- no json scripts to comment in the content --> <div> <h2 style="text-align: center;"><strong>Automapper set value. CreateMap<Message, MessageDto>() .</strong></h2> <h2 style="text-align: left;"><span style="font-family: Times;"><span style="font-size: medium;"><b><br> </b></span></span></h2> <p>Automapper set value. TSomeDestProp destinationValue; Dec 29, 2021 · With the aim of better understanding IncludeMembers and how it performs, we will use the implementation from the first part and adjust it to suit our needs. namespace AutoMapperDemo. ForMember(messageDTO => messageDTO. CreateMap<Foo, Bar>(); cfg. In the following mapping the property baz will only be mapped if it is greater than or equal to 0 in the source object. 1. Total, opt => opt. Karlsen. ConvertUsing(s => s ?? string. NET 6 and above versions. You define the configuration using profiles. That's why Id property is 0. cs class: public void ConfigureServices(IServiceCollection services) {. If you need complex mapping settings, it is easier to write a method that does this without Automaper. How can I map a value to this class? Destination Class: Mar 14, 2019 · I am currently using Automapper (8. the issue is coming from the MapFrom expression, when that gets a null value, it returns string. ForMember(. CreateMap calls into a profile. C equals "C" instead of "Updated value". CreateMap<UniversalForm, UniversalFormDto>() . You have to think what it is a store of - in this case KeyValuePairs. ForMember<d => d. Details, b => b. If have value means, object type is not returning. CreateMap<Entities. 0) in my . ProblemType)) Feb 6, 2019 · If A. Value converters are scoped to a single map, and receive the source and destination objects to resolve to a value to map to the destination member. So, create a class file named Employee. StringConvert(message. Jan 31, 2018 · new DateTime(input. Map<Character>(dto); is mapping your dto to a new empty Character instance and then you are assigning it to the character variable. net core for mapping values between source and destination. CreateMap<Data. ToString(); Additionally, to make sure two decimal places are always shown even when one or both are zero Jul 30, 2019 · 1. We can build a set of custom type converters, on top of which other mapping configurations use, without needing any extra configuration. The IgnoreNullsOnSource method overrides this default behavior. I wish to have automapper 60. Condition((src, dest, srcMember) => srcMember != null))); Which in my example below, allows for the null update to persist past all the subsiquent updates. MapFrom((src, dest) =>. CreateMap<Resource, SubjectResource>() . ForMember(m=> m. DetailName))) , only null values is assigning. Dependency injection with ASP. UserId, opt => ClaimsPrincipal. Item3 is the default 0 value (because it was never set to any other value), and you ignore the mapping of this property, B. CreateMap<Customer, CustomerDto> (); cfg. Initialize(cfg =>. CreateMap<PersonData, Person>() . One “feature” of AutoMapper allowed you to modify configuration at runtime. SomeDestProp, opt => opt. empty. In simplified syntax: Type converter = Func<TSource, TDestination, TDestination>. Map<ProfileViewModel>(preferences, member, account); This ensured that the preferences object was mapped to the ViewModel first, then the conditional mapping for the account object could take place once the values had been set. Aug 17, 2020 · My rule is to only use AutoMapper in that case, if it does the mapping automatically. Type Map configuration. Ignore()); EDIT: To do custom conditional logic during the mapping you will need to implement a custom resolver: public class NullCheckResolver : IValueResolver<TSrc, TDest, TProp>. If you Mar 30, 2017 · So I decided to use Automapper. cs: public void Configure() var config = new MapperConfiguration(cfg =>. ParentId, map =>. NET Core makes it easy to use and test. Sep 19, 2022 · 0. Automapper uses built-in TypeConverters and I also created some specific TypeConverter implementations. AddProfile<FooProfile>(); }); The MapperConfiguration instance can be stored statically, in a static field or in a dependency injection container. This can be used in situations like the following where we are trying to map from an int to an unsigned int. edited Mar 22, 2016 at 20:46. then map Destination. Mar 27, 2018 · 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. ForMember(d => d. It has a lot of features that make it easy to optimize your queries and improve performance. I checked a couple of options, but it doesn't look like things like a custom value resolver will do the trick. To declare an attribute map, decorate your destination type with the AutoMapAttribute: This is equivalent to a CreateMap<Order, OrderDto>() configuration. Nov 23, 2017 · I can also do this to map a property of a specific type to a userId. AutoMapper is flexible enough that it can be overridden so that it will work with even the oldest legacy systems. AllowNullDestinationValues = false; to do what I want for all classes in application. Items["Foo"] = "Bar"); This is how to setup the mapping for this custom resolver. Oct 3, 2009 · The easiest way is to use the MapFrom () method: ForMember (dest => dest. Summary1. AutoMapper uses a fluent configuration API to define an object-object mapping strategy. ParentId)))) But that gives shows the error: Dec 19, 2014 · I need to map to a protected property on a class using Automapper. Now I wonder whether it is possible to map individual properties and use automapper's type conversion implementation, something like this Custom value resolvers are designed for overriding the mapping of a specific member, when AutoMapper is going to map the objects: Mapper. Type != null. g. Further improvement to the mapping would be much appreciated. The real power of custom type converters is that they are used any time AutoMapper finds the source/destination pairs on any mapped types. 2. As the mapping engine executes the mapping, it can use one of a variety of methods to resolve a destination member value. Condition (x => !String. We will use the following Employee and EmployeeDTO classes: AutoMapper Ignore Property. ForAllMembers(opts => opts. CreateMap<PropertySurvey, PropertyToSurveyOutput>() . NewWindow)); Apr 27, 2015 · Here is the ViewModel containing the DateTime object and the three values that need to be used to create the DateTime: // other field elided. CreateMap<ParentData, Parent>(); Mapper. another use of the ForMember is to Ignore Mappings. Use a custom resolver on the child type or the AfterMap option instead. If I implement a custom TypeConverter for string -> string it will return null, but then the MapFrom will convert that to string. Mar 29, 2017 · We have several options in telling AutoMapper a custom value resolver to use, including: In the below example, we'll use the first option, telling AutoMapper the custom resolver type through generics: Mapper. 8. I have the following scenario: Due to an unfortunate legacy database, I have some classes mapped to NHibernate that I want to flatten into a DTO. CreateMap<string, string>(). 1 and give the one of Variable3 a higher value, eg. Let’s do it in the Startup. 20. cs: public DateTime Convert(DateTime source, DateTime destination, ResolutionContext Configuration. Below is my sample of code to simulate an update process of my dto mapping to my database object. public sbyte flightDay; public sbyte flightMonth; public bool flightYear. AutoMapper can map to/from dynamic objects without any explicit configuration: Similarly you can map straight from Dictionary<string, object> to objects, AutoMapper will line up the keys with property names. Prop, opt => opt. If the DestinationDTO. CreateMap<Source, Destination>() . Latest version: 8. I'd like to be able to do something like this using automapper: Mapper. Type from it. AutoMapper needs to know how to map the nullable int from the ParentId property into the DTO. DependencyInjection. I would instead do something like: AutoMapper. In these cases I would like to map member Type in class Destination from TypeId property. Item3 is equal to 0 (because Automapper didn't set it and thus B. . 6k 14 85 110. ForMember() in case a property mismatches. . AfterMap is independent from the . You use a May 15, 2012 · The problem you are having is because AutoMapper is struggling to map the contents of the Dictionary. Value Transformers. step: 1 The first step is to install the corresponding NuGet package: Install-Package AutoMapper. Oct 6, 2009 at 17:26. Type)) We need to map this property since the names of the properties of Game and GameViewModel are different - if they are the same and of the same type then it will not need a ForMember. CreateMap<UrlPickerState, Link>() . I also feel the possible scenario for others could be you are creating an exception based on your logic inside automapper. cs and copy and paste the following code into it. AutoMapper maps objects to objects, using both convention and configuration. May 13, 2017 · The default behavior of /// Automapper is to set non-nullable destination types to its Default if the Source value is null. dove. If the Name starts with A, then we are assigning the Name Jul 19, 2012 · Now you can use . Mapper. ReverseMap Convention Sep 24, 2016 · Mapping an object with no parameters. There are 20 other projects in the npm registry using @automapper/core. Thanks in advance! Keith. ForMember(pts => pts. I would like to assign a value manually to a DTO property in the Profile of the AutoMapper depending on the value I have in my entity. Put mappings creation to application start code (or before first usage of mapping). Sep 21, 2012 · Is it possible to configure AutoMapper to set all properties to default value in case if the source object is null for specified classes? I know that I should use Mapper. This allows us to not only flatten our source types AutoMapper is a library that takes the pain out of mapping properties. That caused many problems, so the new API does not allow you to do this. Sent is mapped with true: . Net Core Applications and how we can implement it with ease. There is a NuGet package to be used with the default injection mechanism described here and used in this project. Oct 27, 2016 · Let’s have a look at how to add Auto mapper into our . 0. Dic, opt => opt. public class ParentChildMapper. We have tried to used UseDestinationValue() and Ignore() methods on member, but it is not preserving the existing values. CreateMap<Source, Destination>(); It works properly but sometimes member Type in class Source becomes null. All Source enum values which have no Target equivalent, will throw an exception if EnumMappingValidation is enabled. SourceValue,2, MidpointRounding. Starting with version 13. MapFrom (typeof (CustomValueResolver)) MapFrom (aValueResolverInstance) In the below example, we’ll use the first option, telling AutoMapper the custom resolver type through generics: var configuration = new MapperConfiguration Jul 31, 2015 · And you want to copy an existing object of type ObjectA into a new object of type ObjectB, using AutoMapper you have to do this: var objectA = new ObjectA { Property1 = "Hello, World!", Property2 = 1 } var objectB = new ObjectB(); // Copy data from a to b. nx. However, we need to keep some of the values in destination as it is after mapping. Member, "THIS STRING">(); I'd like d. cs and copy and paste the following code. automapper. May 30, 2020 · Mukesh Murugan. : . So this is my solution, but I cannot up AutoMapper allows you to add conditions to properties that must be met before that property will be mapped. PropertyName)); AutoMapper uses a fluent configuration API to define an object-object mapping strategy. In the current implementation, we have two classes – User: public class User. It converts the input object of one type to the output object of another type until the latter type follows or maintains the conventions of AutoMapper. answered Apr 15, 2014 at 14:08. 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. Sep 3, 2014 · 5 useful tips to help get the most from AutoMapper. TypeGroup)); You only need one MapperConfiguration instance typically per AppDomain and should be instantiated during startup. NET 5, and . 7,193 1 30 34. 1 to allow for a type mapping where the destination value might be null depending on the source value. ForAllMembers(opt => opt. Below is the Jun 27, 2019 · After that, property Variable3 can be mapped from the value already set in property Variable2. Item3 to B. UserId)) But I can't find a way to make this to some kind of convention so that everytime models are mapped and there is a Property "UserId" it should be set to ClaimsPrincipal Aug 9, 2013 · Try using AfterMap MappingExpression in AutoMapper and then check for null value. Entities. Ticks, DateTimeKind. Ignore()); Then pass in options when you call your map: int someValue = 5; Jul 1, 2020 · dest = iStudentListItemDto; // I'm assigning values to destination. MapFrom(message => MySqlFuncs. To map a CharacterDto to an existing Character object you need to use: var character = _context. Both classes have the same number, same name, and same types of properties. AutoMapper is geared towards model projection scenarios to flatten complex object models to DTOs and other simple objects, whose design is better suited for Sep 18, 2015 · In recent versions of AutoMapper, ResolveUsing was removed. What I want is a generic rule ( or statement) for the default value of Guids, DateTimeOffset and Int. This is what I have so far: Jun 1, 2020 · I'm fairly new to AutoMapper and want to know how to set a destination member to a value based on a DIFFERENT source property value and if that value is null I just want to apply the default behaviour of Automapper (keep destination value when the source is null) Dec 21, 2015 · 101. CreateMap<Game, GameViewModel>() . Units' must resolve to top-level member and not any child object's properties. NullSubstitute() to replace NULL value to some custom value in Automapper, e. The package AutoMapper. CreateMap<Order, OrderDto>()); The type on the left is the source type, and the type on the right is the destination type. Mapper. 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. My current code looks like this: AutoMapperConfiguration. CreateMap<TSource, TDest>(); I want that all Properties of TSource that are string Empty are mapped to NULL in TDest corresponding Properties. asked Mar 22, 2016 at 20:22. For example, we might have a simple source and destination type: public class Source { public int Value { get; set; } } public class Destination { public int Value { get; set; } } All the basic generic collection types May 8, 2015 · Of course this code won't work if type conversions are required. @iammukeshm. Employee>(). MapFrom(src => src. step: 2. AutoMapper allows you to add conditions to properties that must be met before that property will be mapped. NullSubstitute("N/A")); Lists and Arrays. CreateMap<Model, Command>() . In order to search for maps to configure, use the AddMaps method: AddMaps looks for fluent map configuration ( Profile classes) and attribute-based mappings. Group, o => o. Joe. Deleted. AutoMapper is geared towards model projection scenarios to flatten complex object models to DTOs and other simple objects, whose design is better suited for Configuration. public void MapData(ParentData parentData) {. More examples of initial setup can be seen in Setup. map. Ignore the property in your config: cfg. Initialize(cfg => cfg. AfterMap((src, dest) =>. ConvertUsing<UtcToLocalConverter>(); }); UtcToLocalConverter. 1, last published: 3 months ago. 2. mapper. I think that will have to be done outside the mapping. I've got a public method exposed on this class that is used to set values to the property. AddAutoMapper(typeof(Startup)); The real power of custom type converters is that they are used any time AutoMapper finds the source/destination pairs on any mapped types. Here, you can see. Changed MapFrom it was my fault now it must work fine. So our first mapping is very straightforward. So, create a class file with the name MapperConfig. If you public class Target { public string Value; } public class Source { public string Value1; public string Value2; } Now I want to configure Auto Map, to Map Value1 to Value if Value1 starts with "A", but otherwise I want to map Value2 to Value. It looks to me like it's keeping the instance of List<Child>, but it is creating new instances of Child within the List. We’ll explain the configuration for both . Apr 17, 2013 · To change this, make sure you add a third parameter, MidpointRounding. That's what I want in a nutshel: if Source. Dynamic mapping, such as Mapper. OpenInNewWindow,map=>map. IsNullOrEmpty (x. {. ProblemType, opt=> opt. Map<Source, Dest>(src, opt => opt. Feb 23, 2023 · AutoMapper in C# is a library used to map data from one object to another in web development. It acts as a mapper between two objects and transforms one object type into another. The example below shows that the testFunction has only run once as Variable2 and Variable3 have been given the same Guid value. Nested Mappings. AutoMapper only requires configuration of element types, not of any array or list type that might be used. After installing the required package, the next step is to configure the services. Member to always be "THIS STRING" and not be mapped from any particular member from the source model. Apr 3, 2020 · If give like this means, . This will use the rounding method you're familiar with: return Math. – Jon Erickson. AwayFromZero). Below you can see my code, but it doesn't work as expected because the . Sent, mapper. When calling map you can pass in extra objects by using key-value and using a custom resolver to get the object from context. You can use the ForMember method to specify the destination property and then use the MapFrom method to set a fixed value. For example, we might have a simple source and destination type: public class Source { public int Value { get; set; } } public class Destination { public int Value { get; set; } } All the basic generic collection types Dynamic and ExpandoObject Mapping. CreateMap<DateTime, DateTime>(). NullSubstitute(new DateTime(2017,12,12))); The only potential problem with this is it requires you to supply the source type to map from. DynamicMap, is no longer possible. It looks something like this: Here is what I ultimately want: public virtual SampleType SampleType { get; set; } public virtual Project Project { get; set; } public virtual long Variant { get; set; } You only need one MapperConfiguration instance typically per AppDomain and should be instantiated during startup. With this configuration, AutoMapper allows null collections from the source object and tries to map to the destination object. CreateMap<MenuTable, Menu>(). And last - with Automapper you can create mapping and define how to do custom map for some properties: Mapper. GameType, opt => opt. NET Core application. Till time this is working fine. MapFrom(s => s. Empty should map to NULL. – Alexander Petrov Jan 16, 2020 · We are using AutoMapper (9. 1) api project. Dec 17, 2013 · Legacy code, that's why - too much pain to change it all). However, after executing the code above, parentTwo. Oct 3, 2011 · 14. HouseName maps to HouseName, Street maps to Street and so forth. We have several options in telling AutoMapper a custom value resolver to use, including: MapFrom<TValueResolver>. – Lasse V. Aug 16, 2023 · To make this work, we have to avoid automapper trying to set destination members when the source member is null. This method requires a parameter. I would like AutoMapper to construct the flightDate from the other three values. You can also disable constructor mapping: You can configure which constructors are considered for the I was getting this exception when there was a code trying to resolve an enumeration for a invalid value inside automapper. Value transformers apply an additional transformation to a single type. Microsoft. Proration, I want to set Destination entity class's Property1 to be true, similarly depending on what payout it is, I might want to set another Property in the entity class. CreateMap<srcType, destType>. LTRIM(MySqlFuncs. Round((decimal)context. 0) in . MapFrom(x=> (ProblemTypeViewModel)(int)x. CreateMap<ProblematicCustomer, ProblematicCustomerViewModel>() . dest => dest. However, we don't want to manually map each property individually and set null mapping properties, so we want to use ForAllMembers and we have 2 options to use: PreCondition and Condition. Timestamp, opt => opt. I will also leave the link to my GitHub Repository for the source code used in this guide. Nov 26, 2018 · 1. CreateMap<Address, AddressDto> (); }); We are letting the automapper magic do its thing. Learn how to use AutoMapper's static and instance APIs to map objects of different types and configure your mappings in this documentation. EnumMapping will map all values from Source type to Destination type if both enum types have the same value (or by name or by value). You can't do exactly what you want, but you can get pretty close by specifying mapping options when you call Map. ForMember (o => o. CreateMap<ChildData, Child>(); //Populates both the Parent & List of Child Feb 25, 2023 · To achieve this we need to use AutoMapper Conditional Mapping in C#. ForMember(m=>m. AwayFromZero, to your round. For mapping to destination child objects, you can use the dot notation. AutoMapper TypeScript Core. Map<Employee, EmployeeDto>(employee); Jun 10, 2017 · You can ignore a specific property when you configure your mappings. Item3. It converts domain objects into DTOs, which makes the codebase more maintainable. Create a MapperConfiguration instance and initialize configuration via the constructor: var config = new MapperConfiguration(cfg => { cfg. MapFrom(s=>s. MapFrom (src => 42)); It's there to do custom mapping from the source object, but it's any Func<TSource, object>, so you can so really whatever you want. Change configuration during mapping. FirstOrDefaultAsync(); Right now _mapper. Value. Similar to David Wick's answer, you can also use ConvertUsing with a lambda expression, which eliminates the requirement for an additional class. Item3 has the default int value); which is the exact same outcome as when Automapper does in fact copy over the default value 0 from A. CreateMap<Message, MessageDto>() . Extensions. Lists and Arrays. Note: The name of property " Name " of Employee class is not the same as that of property " FullName " of EmployeeDto class. Start using @automapper/core in your project by running `npm i @automapper/core`. ResolveUsing<DictionaryResolver>()); However, when you use a custom type resolver, this takes complete control of the mapping: there is Jan 31, 2024 · AutoMapper has a configuration method named AllowNull(). And then you let AutoMapper know in what assemblies are those profiles defined by Nov 11, 2022 · 1. 0 how to map a specific property. I've currently not found a way to globally assign this condition without setting it Storing Fixed Values: Storing a fixed value into a destination property is straightforward. Older versions of Automapper allowed an AllowNullDestination flag to be set via the Mapper configuration but I can't find the equivalent recipe for the new version and the old mechanism of configuring via the static Mapper object The Simplest Way I found that work for me is as below: My Enum is a nested in another class so I Use ForMember method and MapFrom as below: Mapper. Optionally value converters can receive the source member as well. net core (2. Storing Dynamic Values: Dynamic values can be based on the source object, external variables, or complex calculations. PropertyName, opt => opt. Current. DateDeleted, opt => opt. #dotnet. Will crash if any of the properties can't be mapped to a string: Will crash if any of the properties can't be mapped to a string: cfg. 0, AddAutoMapper is part of the core package and the DI package is discontinued. Use the Condition () feature to map the member when the condition is true: As I understand it, AutoMapper will create new instances of complex properties unless you use the UseDestinationValue() option. Apr 20, 2013 · AutoMapper - set a destination property to null when source property is not available 0 AutoMapper nulls out properties in destination object when the destination is an existing object with some populated properties Dec 7, 2010 · The mapping works fine to create the List collection with correct data but I need to have a ForEach to assign the parent instance reference. Employee, Domain. In the above example, we never have to specify the string/int 1. 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 both LINQ projections and in-memory mapping. for the ItemName destination property, we are using ternary operator and setting the value. And here's the code to map the Employee object to EmployeeDto: Mapper. Oct 30, 2016 · How can I edit those value on mapping? AutoMapper: manually set property. ResolveUsing<CustomResolver>()); Expression 'prop => prop. Property. Feb 23, 2016 · class ProductWithCategories // Source class { public Product Product { get; set; } // Product is an EF entity class public IEnumerable<Category> Categories { get; set; } } class ProductViewModel // Dest class { public int Id { get; set; } // Other properties with the same name as Product class public IEnumerable<CategoryViewModel> Categories Apr 14, 2022 · So far, I can handle Null values as follows : cnfg. }); The reason why I am mapping it this ways is because I need to map Subjects and Grades property of Students class, which is are comma delimited values to IEnumerable<SubjectGradeDto>. I tried to use the functions from MySqlFuncs class: . This article will talk about Automapper in ASP. MapFrom (typeof (CustomValueResolver)) MapFrom (aValueResolverInstance) In the below example, we’ll use the first option, telling AutoMapper the custom resolver type through generics: var configuration = new MapperConfiguration All null values on all properties will be substituted as "N/A". By using both the AllowNull() and the Condition(() => srcMember != null) rules, we configure AutoMapper to ignore null values for list and collection types. Before assigning the value, AutoMapper will check to see if the value to be set has any value transformations associated, and will apply them before setting. ForMember(m => m. myDate, o => o. Since AutoMapper requires an instance to map to, setting the destination to null seems like it should go outside the mapping. Is there a way to set all properties of a class, that I'm mapping, that is string. AutoMapper uses a convention-based matching algorithm to match up source to destination values. Condition, as a matter of fact every dest. c#. ForMember(x => x. Payout == Payout. 0. The problem here is not that you're overwriting the properties, the problem is that the overload you used constructed a new target object, the instance in test1 was never used, instead you overwrote test1 with this new instance, losing the original one where you had assigned to that Id property. AutoMapper. Empty. We do this often when we share DTOs and we set flags differently for separate mapping scenarios. public int Id { get; set; } public string FirstName { get; set; } public string LastName { get; set; } Jun 30, 2018 · Property3{get;set;} public Enum Payout{get; set;} Proration = 1, Recurrent = 2, Lumpsum = 3. Nov 28, 2023 · Configuration. ForMember(dest => dest. Ideally I'd like to populate this during automapping, otherwise the mapper will throw a wobbler at me because "Type" isn't mapped: Mapper. UserDiaryEventType, DiaryEventType_dto>() . public DateTime flightDate; // other field elided. Empty); edited Oct 7, 2014 at 17:57. Here the sampled code that I use for tests, but it doesn't work Oct 7, 2009 · answered Oct 6, 2009 at 17:07. MapFrom(ps => ps. services. The Ignore () feature is strictly for members you never map, as these members are also skipped in configuration validation. But you must to declare mapping C=> B. Keith Doran. AutoMapper 3. We will go through the features of Automapper and the problems it solves by practical use cases. Value resolver = Func<TSource, TDestination Dec 22, 2010 · So the call to my three-way mapping was: var profileViewModel = EntityMapper. To do so, set the mapping order of Variable2 to eg. Jun 8, 2017 · Then I use Automapper to map Source to Destination: cfg. Utc) : null )); Error: Type of conditional expression cannot be determined because there is no implicit conversion between '<null>' and 'DateTime' Apr 1, 2016 · I'm having some problems working out how to get Automapper 4. Configuration. AutoMapper is a productivity tool designed to help you write less repetitive code mapping code. In the above example, we never have to specify the string/int Let us understand how to use the AutoMapper Ignore Method with an example. var config = new MapperConfiguration(cfg => cfg. Instead, use a new overload of MapFrom: Just adding another lambda/function parameter will dispatch to this new overload: CreateMap<TSource, TDest>() . You’ll need to move all your Mapper. AfterMap (Action<TSource, TDestination> afterFunction); Example: // Execute a custom function to the source and/or destination types after member mapping. cfg. Construction. 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