次のクラスにAutoMapper + EF (エンティティ => POCO) を使用しています。
public class Category
{
public int CategoryID { get; set; }
public string Name { get; set; }
public Category Parent { get; set; }
public IList<Category> Children { get; set; }
}
このクラスはそれ自体 (Parent / Children) と関係があるため、AutoMapper はおかしくなり、Stackoverflow 例外をスローしました。この問題を経験したことがありますか？
CustomValueResolvers を作成して解決しました。それは美しいことではありませんが、機能しています。
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;
}
}
これは既知の問題のようです。Automapperは無限のループに入ります。
Here is a link to someone who managed to get around this problem:
Add here is a link to the translated version of this page :)