使用参数构造函数和 Ninject 配置 Automapper 配置文件 Class

Question

我正在使用 Automapper (v5.1.1.0) 和 Ninject (v3.2.0.0)。我的个人资料 class 是：

public class ApplicationUserResponseProfile : Profile
{
    public ApplicationUserResponseProfile(HttpRequestMessage httpRequestMessage) 
    {
        UrlHelper urlHelper = new UrlHelper(httpRequestMessage);
        CreateMap<ApplicationUser, ApplicationUserResponseModel>()
            .ForMember(dest => dest.Url, opt => opt.MapFrom(src => urlHelper.Link("GetUserById", new { id = src.Id })));
    }

    public ApplicationUserResponseModel Create(ApplicationUser applicationUser)
    {
        return Mapper.Map<ApplicationUserResponseModel>(applicationUser);
    }
}

而 AutoMapperWebConfiguration 是：

Mapper.Initialize(cfg =>
        {
            cfg.AddProfile<ApplicationUserResponseProfile>(); // unable to configure
        });

我也试过将它绑定到 Ninject 内核中：

var config = new MapperConfiguration(
            c =>
            {
                c.AddProfile(typeof(ApplicationUserResponseProfile));
            });
var mapper = config.CreateMapper();
kernel.Bind<IMapper>().ToConstant(mapper);

和不同的方式：

Mapper.Initialize(cfg =>
        {
            cfg.ConstructServicesUsing((type) => kernel.Get(type));
            cfg.AddProfile(typeof(ApplicationUserResponseProfile));
        });

但是在两个方面都出错了 -

No parameterless constructor defined for this object

请帮助我。我无法使用 Ninject 配置 AutoMapper 配置文件 class（具有参数）。有什么不同的方法可以解决这个问题吗？

Answer 1

我已经用不同的方式解决了这个问题。我已经从静态而不是 Profile 方法迁移 automapper。

public class ApplicationUserResponseFactory
{
    private MapperConfiguration _mapperConfiguration;
    public ApplicationUserResponseFactory(HttpRequestMessage httpRequestMessage) 
    {
        UrlHelper urlHelper = new UrlHelper(httpRequestMessage);
        _mapperConfiguration = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<ApplicationUser, ApplicationUserResponseModel>()
                .ForMember(dest => dest.Url, opt => opt.MapFrom(src => UrlHelper.Link("GetUserById", new { id = src.Id })));
        });

    }

    public ApplicationUserResponseModel Create(ApplicationUser applicationUser)
    {
        return _mapperConfiguration.CreateMapper().Map<ApplicationUserResponseModel>(applicationUser);
    }
}

我找到迁移程序了

Answer 2

您可以像这样创建解析器：

public class YourResolver : IValueResolver<ApplicationUser, ApplicationUserResponseModel, string>
{
    HttpRequestMessage HttpRequestMessage { get; }
  
    public YourResolver(HttpRequestMessage httpRequestMessage)
    {
      HttpRequestMessage = httpRequestMessage;
    }
  
    public string Resolve(ApplicationUser source, ApplicationUserResponseModel destination, string destMember, ResolutionContext context)
    {
       //do something with your HttpRequestMessage and return a value;
    }
}

然后在个人资料中：

public class ApplicationUserResponseProfile : Profile
{
    public ApplicationUserResponseProfile()
    {
        CreateMap<ApplicationUser, ApplicationUserResponseModel>()
                 .ForMember(dest => dest.Url, opt => opt.MapFrom<YourResolver>());
    }
}

来源：https://docs.automapper.org/en/stable/Dependency-injection.html

使用参数构造函数和 Ninject 配置 Automapper 配置文件 Class

Configure Automapper Profile Class with Parameter Constructor and Ninject

c#

asp.net-mvc

ninject

automapper-5