自动化性能

Question

我正在使用Automapper将我的业务模型映射到ViewModel.

它有效,但速度很慢.

我有一个包含6893个对象的集合,有23个属性(测试环境,生产应该有更多).

使用循环00:02:32.8118534来映射所有内容.

var objects = // get all items (returns a collection of MyObj)
List<MyViewModel> collection = new List<MyViewModel>();
foreach (MyObj obj in objects)
{
     MyViewModel vm = Mapper.Map<MyObj, MyViewModel>(obj);
     collection.Add(vm);
}

我试着像这样改进它:

var objects = // get all items (returns a collection of MyObj)
IEnumerable<MyViewModel> collection = mapper.Map<IEnumerable<MyObj>, IEnumerable<MyViewModel>>(objects);

它00:02:25.4527961绘制了一切.

所以它没有那么多帮助.

我的对象的属性都不是null.

这是我配置映射器的方式:

var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<MyObj, MyViewModel>();
            cfg.CreateMap<MyObjOtherObj, MyViewModelOtherObj>();
        });
mapper = config.CreateMapper();

MyObj中:

public partial class MyObj
{
    public MyObj()
    {
        this.MyObjOtherObj= new HashSet<MyObjOtherObj>();
    }

    public long a{ get; set; }
    public short b{ get; set; }
    public string c{ get; set; }
    public string d{ get; set; }
    public string e{ get; set; }
    public string f{ get; set; }
    public string g{ get; set; }
    public string h{ get; set; }
    public string i{ get; set; }
    public string j{ get; set; }
    public string k{ get; set; }
    public string l{ get; set; }
    public string m{ get; set; }
    public bool n{ get; set; }
    public bool o{ get; set; }
    public bool p{ get; set; }
    public bool q{ get; set; }

    public virtual ICollection<MyObjOtherObj> MyObjOtherObj{ get; set; }
    public virtual Types Types { get; set; }
}

MyViewModel:

public class MyViewModel
{
    public long a{ get; set; }
    public short b{ get; set; }
    public string c{ get; set; }
    public string d{ get; set; }
    public string e{ get; set; }
    public string f{ get; set; }
    public string g{ get; set; }
    public string h{ get; set; }
    public string i{ get; set; }
    public string j{ get; set; }
    public string k{ get; set; }
    public string l{ get; set; }
    public string m{ get; set; }
    public bool n{ get; set; }
    public bool o{ get; set; }
    public bool p{ get; set; }
    public bool q{ get; set; }
    public string TypesDescription { get; set; }

    public List<MyViewModelOtherObj> MyObjOtherObj { get; set; }
}

MyObjOtherObj:

public partial class MyObjOtherObj
{
    public long id{ get; set; }
    public long MyObjId { get; set; }
    public short x{ get; set; }
    public string z{ get; set; }

    public virtual MyObj MyObj{ get; set; }
    public virtual SourceTypes SourceTypes { get; set; }
}

MyViewModelOtherObj:

public class MyViewModelOtherObj
{
    public long Id { get; set; }
    public long MyObjId { get; set; }
    public short x{ get; set; }
    public string z{ get; set; }
    public string SourceTypesDescription { get; set; }
}

编辑:

SourceTypes:

public partial class SourceTypes
{
    public SourceTypes()
    {
        this.MyObjOtherObj = new HashSet<MyObjOtherObj>();
    }

    public short SourceTypeId { get; set; }
    public string Description { get; set; }

    public virtual ICollection<MyObjOtherObj> MyObjOtherObj { get; set; }
}

类型:

public partial class Types
{
    public Types()
    {
        this.MyObj = new HashSet<MyObj>();
    }

    public short TypeId { get; set; }
    public string Description { get; set; }

    public virtual ICollection<MyObj> MyObj{ get; set; }
}

Answer 1

5.0版本的AutoMapper具有显着的性能提升.在我们的基准测试中,使用您在此处显示的非常相似的类型,我们可以在一秒钟内映射一百万个项目.在即将发布的5.1版本中,我们的收缩甚至比手工映射慢大约3倍,这主要是因为无法检查手工映射是不行的.

我升级了.

Answer 2

为了响应我们的评论，您需要立即加载您的集合对象。请查看以下文章，这应该可以解决您的问题：

加载相关实体