Automapper将子列表映射到同一类型 [英] Automapper map child list with from same type

问题描述

我有可能有孩子的孩子，孩子可能有孩子等等...
当我获得数据库模型时，所有实体都可以正确的孩子和父母。但是当我想要映射以查看模型时，问题出现在：
有没有可能的方式从这样的数据库映射模型？

I have entities that may have children and their children may have children and so on... When I get database models all entities are OK with correct children and parent. But the problem comes when I want to map to view model: Is there any possible way to map models from database like this?

// database model code first
public class Tomato
{
    public int Id { get; set; }

    public string Name { get; set; }

    public int? ParentId { get; set; }

    public virtual Tomato Parent { get; set; }

    public ICollection<Tomato> Children { get; set; }
}

// mvc view model
public class TomatoViewModel
{
    public int Id { get; set; }

    public string Name { get; set; }

    public int? ParentId { get; set; }

    public ICollection<TomatoViewModel> Children { get; set; }
}

配置 configuration.CreateMap< Tomato，TomatoModel> （），但尝试绑定子元素时会抛出 StackOverflowException 。试用

Configured configuration.CreateMap<Tomato, TomatoModel>() but throws an StackOverflowException when try to bind child elements. Tried with

configuration.CreateMap<Tomato, TomatoViewModel>().ForMember( t => t.Children,
                options => options.Condition(context => (context.SourceValue as Tomato).ParentId == this.Id));
// this.Id refers to TomatoViewModel.Id

更新：在我的控制器类中：

Update: in my controller class:

var models = foodIngredientsService.GetAllTomatoes().Where(t => t.ParentId == null).To<TomatoModel>().ToList();

第二个问题：如何使用 options.Condition（Func< TomatoModel，bool> func） ??

推荐答案

您指定子成员映射;

configuration.CreateMap<Tomato, TomatoViewModel>()
.ForMember(t => t.Children, options => options.MapFrom(source => source.Children));

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