c# - 一种类型的属性映射到另一种类型的实例

Question

我正在使用 automapper 相互映射 View 模型和实体模型，一切都很好，但现在我遇到了一些不同的情况，AutoMapper 无法映射我的类型。

我的 View 模型:

   public class CriminalSearchViewModel
   {

    public CriminalSearchParamsViewModel SearchParameters { get; set; }

    public SelectList GenderSelectList { get; set; }

    public SelectList NationalitySelectList { get; set; }

    public SelectList CrimeSelectList { get; set; }

    public SelectList CriminalStatusSelectList { get; set; }
}

第二个 View 模型:

public class CriminalSearchParamsViewModel
{
    [Required]
    public string FirstName { get; set; }

    public string LastName { get; set; }

    public int? GenderID { get; set; }

    public int? StatusID { get; set; }

    public string CNIC { get; set; }

    public int? AgeFrom { get; set; }

    public int? AgeTo { get; set; }

    public double? Height { get; set; }

    public int Weight { get; set; }

    public int? NationalityID { get; set; }
}

和我的商业模式:

public class CriminalSearch
{

    public string FirstName { get; set; }

    public string LastName { get; set; }

    public int? GenderID { get; set; }

    public int? StatusID { get; set; }

    public string CNIC { get; set; }

    public int? AgeFrom { get; set; }

    public int? AgeTo { get; set; }

    public double? Height { get; set; }

    public int Weight { get; set; }

    public int? NationalityID { get; set; }

}

我定义的映射如下:

Mapper.CreateMap<CriminalSearch, CriminalSearchParamsViewModel>();

也试过这个:

 Mapper.CreateMap<CriminalSearchParamsViewModel,CriminalSearchViewModel>()
  .ForMember(dest => dest.SearchParameters, opt =>
     opt.MapFrom(src => Mapper.Map<CriminalSearchParamsViewModel, CriminalSearch>(src)));

在 Controller 中我正在尝试:

public ActionResult Search(CriminalSearchViewModel searchVM)
{
    if (ModelState.IsValid)
    {
        var searchParams = searchVM.SearchParameters;
        var criminalSearch = AutoMapper.Mapper.Map<CriminalSearch>(searchParams);
        _criminalService.SearchCriminals(criminalSearch);
    }
        return View();
}

但它总是抛出异常:

Missing type map configuration or unsupported mapping.

Mapping types: CriminalSearchParamsViewModel -> CriminalSearch NationalCriminals.UI.ViewModels.CriminalSearchParamsViewModel -> NationalCriminals.Core.Models.CriminalSearch

Destination path: CriminalSearch

Source value: NationalCriminals.UI.ViewModels.CriminalSearchParamsViewModel

谁能告诉我哪里出了问题？

Answer 1

您只需要在方法 CreateMap 中更改通用参数的顺序:

Mapper.CreateMap<CriminalSearchParamsViewModel,CriminalSearch>()

那是因为第一个泛型参数是Source类型，第二个是Destination，它不是双向的，如果你想，你必须声明两者从一种类型映射到另一种类型，反之亦然:

Mapper.CreateMap<CriminalSearchParamsViewModel,CriminalSearch>()
Mapper.CreateMap<CriminalSearch,CriminalSearchParamsViewModel>()

CreateMap 方法描述如下:

AutoMapper.Mapper.CreateMap<SourceClass, DestinationClass>();

Suggest: Using AutoMapper: Creating Mappings