将automapper项目投影到更大的对象中 [英] automapper project into a larger object

问题描述

使用 Automapper ，是否可以将较小的对象投影到较大的对象上?

With Automapper, is it possible to project a smaller object onto a larger one?

例如，控制器接受数据作为ViewModel实例.然后，我需要在数据库中创建一条记录.因此，我将此视图模型投影到域模型上.在我将域模型实例填充到View Model数据后，我将在数据库中存储数据之前手动填充域模型中的其他字段.

For example, a controller accepts data as a ViewModel instance. I would then need to create a record in a database. So I would project this View Model onto a Domain Model. Once I have a Domain Model instance populated with View Model data I would then manually populate the additional fields in the Domain Model before storing data in the database.

有可能这样做吗?

谢谢.

推荐答案

是的，这完全有可能.只需创建从ViewModel到域模型的映射，然后使用 Ignore() 忽略不存在的属性:

Yes this is perfectly possible. Just create a mapping from the ViewModel to the domain model and use Ignore() to ignore non-existing properties:

.ForMember(dest => dest.PropertyOnDomainModel, opt => opt.Ignore()) 

小例子:

public ActionResult Register(UserModel model)
{
    User user = Mapper.Map<User>(model);    
    user.Password = PasswordHelper.GenerateHashedPassword();
    _db.Users.Add(user);
    _db.SaveChanges();
}

使用此配置的映射:

CreateMap<UserModel, User>()
    .ForMember(dest => dest.Password, opt => opt.Ignore());

这可以确保密码不会被AutoMapper覆盖.

This makes sure that the password won't be overridden by AutoMapper.

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