Question

我正在尝试使用.ProjectTo<POHeader, POHeaderViewModel()从数据库表类的address属性映射视图模型的Address属性，但是出现错误： The entity or complex type 'Address' cannot be constructed in a LINQ to Entities query.

我只是在语法上错误地执行了此操作，或者这是不可能的，我需要展平视图模型以包括每个地址字段，或者让它继承自Address并显式映射这些字段？

数据库表：

public partial class POHeader
{
    public int Id { get; set; }
    public int FacilityId{ get; set; }
    public int? ShipToAddressId { get; set; }

    public virtual Facility Facility { get; set; }
    public virtual Address ShipToAddress { get; set; }
}

查看模型

public class POHeaderViewModel
{
    public int Id { get; set; }
    public int? ShipToAddressId { get; set; }

    public Address ShipToAddress { get; set; }
}

地图

CreateMap<POHeader, POHeaderViewModel>(MemberList.Destination)
    .ForMember(dest => dest.ShipToAddress, opt => opt.MapFrom(source => source.Address != null
        ? 
        new Address()
        {
            CompanyName = source.Address.CompanyName,
            Address1 = source.Address.Address1,
            Address2 = source.Address.Address2,
            City = source.Address.City,
            StateOrRegionCode = source.Address.StateOrRegionCode,
            PostalCode = source.Address.PostalCode,
            CountryCode = source.Address.CountryCode,
            PhoneNumber = source.Address.PhoneNumber,
        }
        : new Address() {
            CompanyName = source.Facility.Company.CompanyName,
            Address1 = source.Facility.Address1,
            Address2 = source.Facility.Address2,
            City = source.Facility.City,
            StateOrRegionCode = source.Facility.State,
            PostalCode = source.Facility.PostalCode,
            CountryCode = "US",
            PhoneNumber = source.Facility.PhoneNumber,
        }))

更新1：

我尝试将Facility添加到Address地图：

CreateMap<Facility, Address>(MemberList.Destination)
            .ForMember(dest => dest.CompanyName, option => option.MapFrom(entity => 
                entity.Company != null 
                ? entity.Company.CompanyName
                : "")
            )
            .ForMember(dest => dest.FirstName, option =>option.Ignore())
            .ForMember(dest => dest.LastName, option => option.Ignore())
            .ForMember(dest => dest.Address3, option => option.Ignore())      
            .ForMember(dest => dest.StateOrRegionCode, option => option.MapFrom(entity => entity.State))
            .ForMember(dest => dest.CountryCode, option => option.MapFrom(entity => entity.Country))

然后将POHeaderViewModel映射更改为以下内容……但出现错误：Type of conditional expression cannot be determined because there is no implicit conversion between 'Address' and 'Facility'

CreateMap<POHeader, POHeaderViewModel>(MemberList.Destination)
    .ForMember(dest => dest.ShipToAddress, c => c.MapFrom(m => 
        m.Address != null 
        ? m.Address
        : m.Facility
        ))

自动映射器可查询扩展映射到类

0 个答案: