Links

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

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