Automapper许多一对多stackoverflowexception [英] Automapper many-to-many stackoverflowexception

问题描述

我得到一个堆栈溢出以下映射：

  Mapper.CreateMap<家长，ParentViewModel>（）
 .ForMember（X => x.Children，O => o.MapFrom（X => x.Children.ConvertToChildrenViewModel（）））; 
 
 Mapper.CreateMap<儿童，ChildrenViewModel>（）
 .ForMember（X => x.Parents，O => o.MapFrom（X => x.Parents.ConvertToParentViewModel （）））; 
  

我明白为什么会这样，显然这里的无限循环。我怎么得到这个在automapper工作？我需要家长了解自己的孩子和他们的孩子了解自己的父母。我会创建另一个视图模型为 Children.Parents 不包含父母？。孩子属性

扩展方法的例子，同样为孩子：

 公共静态的IList< ParentViewModel> ConvertToParentViewModel（这IEnumerable的<家长和GT;家长）
 {
返回Mapper.Map<&IList的LT; ParentViewModel>>（父母）; 
} 
  

解决方案

AutoMapper并跟踪什么映射，但只有在一个单一的地图调用，而不是多个外部调用Mapper.Map的情况下。

您应该不需要在任映射配置的ForMember件。如果删除，AutoMapper将遍历父/子关系，并跟踪那些已经被映射。

I'm getting a stack overflow for the following mapping:

Mapper.CreateMap<Parent, ParentViewModel>()
                .ForMember(x => x.Children, o => o.MapFrom(x => x.Children.ConvertToChildrenViewModel()));

Mapper.CreateMap<Children, ChildrenViewModel>()
                .ForMember(x => x.Parents, o => o.MapFrom(x => x.Parents.ConvertToParentViewModel()));

I understand why this is happening, clearly an infinite loop here. How am I supposed to get this to work in automapper? I need parents to know about their children and their children to know about their parents. Would I have to create another ViewModel for Children.Parents that doesn't contain the Parents.Children property?

Extension methods example, similarly for children:

public static IList<ParentViewModel> ConvertToParentViewModel(this IEnumerable<Parent> parents)
        {
            return Mapper.Map<IList<ParentViewModel>>(parents);
        }

解决方案

AutoMapper does keep track of what's mapped, but only in the context of a single Map call, not multiple external calls to Mapper.Map.

You shouldn't need the ForMember piece on either mapping configuration. If you remove that, AutoMapper will traverse the parent/child relationships and keep track of what has already been mapped.

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