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MappingGenerator is discontinued in the form of FOSS. I spent the last three months (March 2021 - June 2021) working hard on improving MappingGenerator. I solved many issues and added a bunch of new cool features. I also made a general refactoring which restored the project maintainability. All of that cost me a lot of my private time and I did it all by myself, so I decided to convert MappingGenerator into a commercial product. A perpetual license for a new version of MappingGenerator can be obtained via the official product website

I would like to thank all of you who contributed to this product by reporting issues, testing, authoring PRs, or buying me coffee. PR authors (except the Only README Updaters) and Coffee Buyers will be awarded with a special license for MappingGenerator for free - I will send them an email with details in a few days.


Mapping Generator Tweet

"AutoMapper" like, Roslyn based, code fix provider that allows to generate mapping code in design time. Read more Mapping Generator – Design Time Alternative to AutoMapper

You can download it as Visual Studio Extension from Visual Studio Marketplace.


The reasons behind why I don't use AutoMapper


Before you start any contributing work, please read the contribution guideline

Supported IDE


Install as VSIX from Market place or as a NuGet package. Verify your Roslyn integration option in case you are using R#.

JetBrains Rider

Install as a NuGet package


Install as a NuGet package or use this instruction to install from VSIX

Using along with Resharper

If you are not able to open Roslyn refactoring menu (ctr + .) please verify your Resharper settings related to Visual Studio Integration or Visual Studio code analysis (depends on the R# version). For more information please check #50

resharper settings

Main features

Generate mapping method body

Pure mapping method

Non-void method that takes single parameter

public UserDTO Map(UserEntity entity)

Generating pure mapping method implementation

Updating method

Void method that takes two parameters

public void Update(UserDTO source, UserEntity target)

Generating update method implementation

Mapping Constructor

Constructor method that takes single complex parameter

public UserDTO(UserEntity user)

Generating mapping constructor implementation

Constructor method that takes more than one parameter

public UserDTO(string firstName, string lastName, int age, int cash)

Generating multi-parameter constructor

Updating member method

Void member method that takes single parameter

public void UpdateWith(UserEntity en)

Generating update member method imeplementation

Void member method with more than one parameter

public void Update(string firstName, string lastName, int age)

Generate inline code for fixing Compiler Errors:

CS0029 Cannot implicitly convert type 'type' to 'type'


CS0266 Cannot implicitly convert type 'type1' to 'type2'. An explicit conversion exists (are you missing a cast?)


CS7036 There is no argument given that corresponds to the required formal parameter


Other mappings

  • Complete empty initialization block Generate initialization bloc

  • Complete empty initialization block in lambda expression Expression<Func<T,T2>> = (T) => new T2{} initialization block in lambda expression

  • Provide local accessible variables as parameters for method and constructor invocation locals as parameters

  • Create missing mapping lambda
    mapping lambda

  • Generate ICloneable interface implementation generate clone method

Object scaffolding

sample scaffolding

Mapping rules

  • Mapping Property-To-Property

    target.FirstName = source.FirstName;
    target.LastName = source.LastName;
  • Mapping Method Call-To-Property

    target.Total = source.GetTotal()
  • Flattening with sub-property

    target.UnitId = source.Unit.Id
  • Mapping complex property

     target.MainAddress = new AddressDTO(){
    	BuildingNo = source.MainAddress.BuildingNo,
    	City = source.MainAddress.City,
    	FlatNo = source.MainAddress.FlatNo,
    	Street = source.MainAddress.Street,
    	ZipCode = source.MainAddress.ZipCode
  • Mapping collections

    target.Addresses = source.Addresses.Select(sourceAddresse => new AddressDTO(){
      BuildingNo = sourceAddresse.BuildingNo,
      City = sourceAddresse.City,
      FlatNo = sourceAddresse.FlatNo,
      Street = sourceAddresse.Street,
      ZipCode = sourceAddresse.ZipCode
  • Unwrapping wrappers

    customerEntity.Kind = cutomerDTO.Kind.Selected;
      public enum CustomerKind
      public class Dropdown<T>
          public List<T> AllOptions { get; set; }
          public T Selected { get; set; }
      public class CustomerDTO
          public string Name { get; set; }
          public Dropdown<CustomerKind> Kind { get; set; }
      public class UserEntity
          public string Name { get; set; }
          public CustomerKind Kind { get; set; }
  • Using existing direct mapping constructor

    target.MainAddress = new AddressDTO(source.MainAddress);
  • using existing multi-parameter constuctor

    this.User =  new UserDTO(firstName: entity.FirstName, lastName: entity.LastName, age: entity.Age);