如何解决AutoMapper错误？ （stackoverflow异常！） [英] How to resolve AutoMapper error? (stackoverflow exception!)

问题描述

我正在为以下课程使用 AutoMapper + EF（Entities => POCO）：

  public class Category 
 {
 public int CategoryID {get;组; } 
 
 public string Name {get;组; } 
 
 public Category Parent {get;组; } 
 
 public IList< Category>孩子{get;组;由于这个类与自己有关系（父/子），所以AutoMapper去了疯狂，并抛出一个Stackoverflow异常。有没有人遇到过这个问题？
解决方案
我已经通过创建CustomValueResolvers解决了。这不是美丽的事情，但它正在工作。
  Mapper.CreateMap< Category，CategoryDTO>（）
 .ForMember（c => c.Parent，opt => opt.ResolveUsing< ParentResolver>（））
 .ForMember（c => c.Children，opt => opt.ResolveUsing< ChildrenResolver> ;（））; 
 
 Mapper.CreateMap< CategoryDTO，Category>（）
 .ForMember（c => c.Parent，opt => opt.ResolveUsing< ParentDTOResolver>（））
 .ForMember（c => c.Children，opt => opt.ResolveUsing< ChildrenDTOResolver>（））; 
 
 
 public class ParentResolver：ValueResolver< Category，CategoryDTO> 
 {
 protected override CategoryDTO ResolveCore（Category category）
 {
 CategoryDTO dto = null; 
 
 if（category.Parent！= null）
 dto = Mapper.Map< Category，CategoryDTO>（category.Parent）; 
 
 return dto; 
} 
} 
 
 public class ParentDTOResolver：ValueResolver< CategoryDTO，Category> 
 {
 protected override类别ResolveCore（CategoryDTO类别）
 {
类别poco = null; 
 
 if（category.Parent！= null）
 poco = Mapper.Map< CategoryDTO，Category>（category.Parent）; 
 
 return poco; 
} 
} 
 
 public class ChildrenResolver：ValueResolver< Category，EntityCollection< CategoryDTO>> 
 {
 protected override EntityCollection< CategoryDTO> ResolveCore（Category category）
 {
 EntityCollection< CategoryDTO> dtos = null; 
 
 if（category.Children！= null&& category.Children.Count> 0）
 dtos = Mapper.Map< IList< Category>，EntityCollection< CategoryDTO>> （category.Children）; 
 
 return dtos; 
} 
} 
 
 public class ChildrenDTOResolver：ValueResolver< CategoryDTO，IList< Category>> 
 {
 protected override IList< Category> ResolveCore（CategoryDTO类别）
 {
 IList< Category> pocos = null; 
 
 if（category.Children！= null&& category.Children.Count> 0）
 pocos = Mapper.Map< EntityCollection< CategoryDTO>，IList< Category> （category.Children）; 
 
 return pocos; 
} 
} 
  
 
I am using AutoMapper + EF (Entities => POCO) for the following class:
public class Category
{
    public int CategoryID { get; set; }

    public string Name { get; set; }

    public Category Parent { get; set; }

    public IList<Category> Children { get; set; }
}
Since this class has relationship with itself (Parent / Children), AutoMapper went crazy and threw a Stackoverflow exception. Have ever any of you experienced this problem?
解决方案
I've resolved it by creating CustomValueResolvers. It is not the beautiful thing to do, but it is working.
Mapper.CreateMap<Category, CategoryDTO>()
                .ForMember(c => c.Parent, opt => opt.ResolveUsing<ParentResolver>())
                .ForMember(c => c.Children, opt => opt.ResolveUsing<ChildrenResolver>());

Mapper.CreateMap<CategoryDTO, Category>()
                .ForMember(c => c.Parent, opt => opt.ResolveUsing<ParentDTOResolver>())
                .ForMember(c => c.Children, opt => opt.ResolveUsing<ChildrenDTOResolver>());


public class ParentResolver : ValueResolver<Category, CategoryDTO>
    {
        protected override CategoryDTO ResolveCore(Category category)
        {
            CategoryDTO dto = null;

            if (category.Parent != null)
                dto = Mapper.Map<Category, CategoryDTO>(category.Parent);

            return dto;
        }
    }

    public class ParentDTOResolver : ValueResolver<CategoryDTO, Category>
    {
        protected override Category ResolveCore(CategoryDTO category)
        {
            Category poco = null;

            if (category.Parent != null)
                poco = Mapper.Map<CategoryDTO, Category>(category.Parent);

            return poco;
        }
    }

    public class ChildrenResolver : ValueResolver<Category, EntityCollection<CategoryDTO>>
    {
        protected override EntityCollection<CategoryDTO> ResolveCore(Category category)
        {
            EntityCollection<CategoryDTO> dtos = null;

            if (category.Children != null && category.Children.Count > 0)
                dtos = Mapper.Map<IList<Category>, EntityCollection<CategoryDTO>>(category.Children);

            return dtos;
        }
    }

    public class ChildrenDTOResolver : ValueResolver<CategoryDTO, IList<Category>>
    {
        protected override IList<Category> ResolveCore(CategoryDTO category)
        {
            IList<Category> pocos = null;

            if (category.Children != null && category.Children.Count > 0)
                pocos = Mapper.Map<EntityCollection<CategoryDTO>, IList<Category>>(category.Children);

            return pocos;
        }
    }


                        
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