Mapster

Links

• Mapster on GitHub
• Mapster wiki on GitHub

Mapping

// create destination from data from source var destination = source.Adapt<Destination>(); // update destination with data from source source.Adapt(destination);

Configuration

// global config TypeAdapterConfig.GlobalSettings.Default.IgnoreNullValues(true); // config the mapping from Item to ItemDto TypeAdapterConfig<Item, ItemDto> // src, dest .NewConfig() // create new map config (overwrite existing ones) .ForType() // OR create a map config if no one exists, otherwise append to th existing one .Ignore(dest => dest.Prop1) // do not map Prop1 .Map(dest => dest.Prop2, src => $"{0} {1}", src.Prop2, src.Prop3)); // custom mapping for Prop2

IRegister

Program.cs

// scan the assembly to load the classes implementing IRegister TypeAdapterConfig.GlobalSettings.Scan(typeof(ItemMappingRegister).Assembly); // load only on register var register = new ItemMappingRegister(); var config = new TypeAdapterConfig(); config.Apply(register);

MappingRegisters/ItemMappingRegister.cs

public class ItemMappingRegister : IRegister { public void Register(TypeAdapterConfig config) => config.NewConfig<CreateUpdateItemRequest, Item>(); }

Dependency Injection

Useful if you migrate from Automapper to Mapster and you do not want to change your code you need some injected services in your mappings

dotnet add package Mapster.DependencyInjection

Program.cs

var config = new TypeAdapterConfig(); config.Scan(typeof(ItemMappingRegister).Assembly); config.Compile(); services.AddSingleton(config); services.AddScoped<IMapper, ServiceMapper>();

MappingRegisters/ItemMappingRegister.cs

public class ItemMappingRegister : IRegister { public void Register(TypeAdapterConfig config) => config .NewConfig<ItemDto, Item>() .Map(dest => dest.Id, src => MapContext.Current.GetService<SomeService>().Do(src.Id)); }

MyService.cs

public class MyService(IMapper mapper) { public void Do() { var itemDto = mapper.Map<ItemDto>(item); } }

• Mapster Global Configuration with Dependency Injection

Installation

dotnet add package Mapster