EF 6 & EF Core - MapsterMapper/Mapster GitHub Wiki

For EF 6

PM> Install-Package Mapster.EF6

For EF Core

PM> Install-Package Mapster.EFCore

In EF, objects are tracked, when you copy data from dto to entity containing navigation properties, this plugin will help finding entity object in navigation properties automatically.

• use Mapster.EFCore version 5.x for EFCore 5.x
• use Mapster.EFCore version 3.x for EFCore 3.x
• use Mapster.EFCore version 1.x for EFCore 2.x

Use EntityFromContext method to define data context.

var poco = db.DomainPoco.Include("Children")
    .Where(item => item.Id == dto.Id).FirstOrDefault();

dto.BuildAdapter()
    .EntityFromContext(db)
    .AdaptTo(poco);

Or like this, if you use mapper instance

_mapper.From(dto)
    .EntityFromContext(db)
    .AdaptTo(poco);

Mapster.EFCore also allows ProjectToType from mapper instance.

var query = db.Customers.Where(...);
_mapper.From(query)
    .ProjectToType<Dto>();