[英]AutoMapper Custom Resolver asking for optional parameters in constructor
I am having some issues with a custom resolver in AutoMapper. 我在AutoMapper中遇到了自定义解析器的一些问题。 I am passing in a interface to the constructor of my repository but i keep getting the following error: 我传递的接口到我的存储库的构造函数,但我不断收到以下错误:
Type needs to have a constructor with 0 args or only optional args
Parameter name: type
I can get around it by creating a parameter-less constructor and hard coding the concrete implementation of my repo in there, but i want to inject it. 我可以通过创建一个无参数构造函数并在那里硬编码我的repo的具体实现来解决它,但我想注入它。
My Resolver: 我的解析器:
public class OptionGroupProjectionResolver : ValueResolver<Product, List<OptionGroupProjection>>
{
private readonly IOptionGroupRepository _optionGroupRepository;
public OptionGroupProjectionResolver(IOptionGroupRepository optionGroupRepository)
{
_optionGroupRepository = optionGroupRepository;
}
protected override List<OptionGroupProjection> ResolveCore(Product source)
{
var groupIds = new List<int>();
var optIds = new List<int>();
foreach (var variant in source.Variants)
{
groupIds.AddRange(variant.Options.Select(option => option.GroupId).Distinct());
optIds.AddRange(variant.Options.Select(option => option.Id).Distinct());
}
var groups = _optionGroupRepository.GetAll();
var results = from gr in groups
where groupIds.Contains(gr.Id)
select new OptionGroupProjection
{
Id = gr.Id,
Name = gr.Name,
Options = gr.Options.Where(o => optIds.Contains(o.Id)).ToList()
};
return results.ToList();
}
}
Ninject Config for Repo 用于回购的Ninject配置
_kernel.Bind<IOptionGroupRepository>().To<OptionGroupRepository>();
Mapping Config 映射配置
Mapper.CreateMap<Product, ProductDetailsViewModel>()
.ForMember(
dest => dest.DefaultImage,
opt => opt.MapFrom(src => src.Images.OrderBy(i => i.SortOrder).FirstOrDefault())
)
.ForMember(
dest => dest.SelectOptionGroups,
opt => opt.ResolveUsing<OptionGroupProjectionResolver>()
);
I can't really see what i can do, i am sure i have set something up wrong by my Google skills are failing me today. 我无法真正看到我能做些什么,我确信我已经设置了一些错误,我的谷歌技能今天让我失望了。
Inside of your bootstrapping/initialization code, you need to tell AutoMapper how to resolve dependencies. 在bootstrapping /初始化代码中,您需要告诉AutoMapper如何解决依赖关系。 I haven't used Ninject, but it might be something like this: 我没有使用Ninject,但它可能是这样的:
AutoMapper.Mapper.Configuration.ConstructServicesUsing(t => _kernel.Get(t));
The lambda is what AutoMapper will execute to resolve dependencies at runtime. lambda是AutoMapper将在运行时解决依赖关系的行为。
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