Skip to content
🔄 "AutoMapper" like, Roslyn based, code fix provider that allows to generate mapping code in design time.
C# PowerShell
Branch: master
Clone or download
Latest commit c82a2de Sep 6, 2019

Mapping Generator Tweet

Branch Status
Master Build status
Develop Build status

"AutoMapper" like, Roslyn based, code fix provider that allows to generate mapping code in design time.

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


The reasons behind why I don't use AutoMapper

Further Development

If you find this extension useful (you feel it helps you on the daily basis) you can support further development by buying me a coffee (it's simple, just click the button below). Sometimes it's hard to stay awake till midnight implementing new features, coffee helps me with that. I'm really appreciate for your support.


Before you start any contributig work, plase read the contribution guidline

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. 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);
You can’t perform that action at this time.