Automapper ProjectTo与自定义映射一起使用时不起作用

Question

我正在使用asp.net core 2.2，Microsoft.EntityFrameworkCore（2.2.4），Microsoft.EntityFrameworkCore.Cosmos（2.2.4），AutoMapper.Extensions.Microsoft.DependencyInjection（7.0.0）

这里是我的代码：

MappingProfile.cs

public class MappingProfile : Profile
{
    public MappingProfile()
    {
        CreateMap<Languages, LanguageDTO>();        
        CreateMap<Countries, CountryDTO>().ForMember(dest => dest.Uuid, opt => opt.MapFrom(src => src.CountryId)).ForMember(dest => dest.DisplayName, opt => opt.MapFrom(src => src.DisplayName)).ForMember(dest => dest.DisplayNameShort, opt => opt.MapFrom(src => Helper.ReplaceChars(src.DisplayName))).ForMember(dest => dest.Path, opt => opt.MapFrom(src => Helper.ReplaceChars(src.DisplayName)));
    }
}

ServiceClass.cs

countries = await _mapper.ProjectTo<CountryDTO>(_dbContext.Countries.Where(cc => cc.IsPublished.Equals(true) && cc.LanguageId.Equals(dftLanguageId))).ToListAsync();

模型

public class Countries
{
    public string id
    {
        get;
        set;
    }

    public int CountryId
    {
        get;
        set;
    }

    public int? SVGImageId
    {
        get;
        set;
    }

    public int? PNGImageId
    {
        get;
        set;
    }

    public bool IsPublished
    {
        get;
        set;
    }

    public string CreatedBy
    {
        get;
        set;
    }

    public string CreatedDate
    {
        get;
        set;
    }

    public string UpdatedBy
    {
        get;
        set;
    }

    public string UpdatedDate
    {
        get;
        set;
    }

    public int? CountryContentId
    {
        get;
        set;
    }

    public int? LanguageId
    {
        get;
        set;
    }

    public string DisplayName
    {
        get;
        set;
    }

    public string DisplayNameShort
    {
        get;
        set;
    }
}

public class CountryResult
{
    public CountryResult()
    {
        Countries = new List<CountryDTO>();
    }

    public List<CountryDTO> Countries
    {
        get;
        set;
    }
}

public class CountryDTO
{
    [JsonProperty("pngimagePath")]
    [RegularExpression(Constants.GeneralStringRegularExpression)]
    public string PNGImagePath
    {
        get;
        set;
    }

    = "";
    [JsonProperty("svgimagePath")]
    [RegularExpression(Constants.GeneralStringRegularExpression)]
    public string SVGImagePath
    {
        get;
        set;
    }

    = "";
    [RegularExpression(Constants.GeneralStringRegularExpression)]
    public string DisplayName
    {
        get;
        set;
    }

    = "";
    [RegularExpression(Constants.GeneralStringRegularExpression)]
    public string DisplayNameShort
    {
        get;
        set;
    }

    = "";
    [RegularExpression(Constants.GeneralStringRegularExpression)]
    public string ProviderName
    {
        get;
        set;
    }

    = "";
    [RegularExpression(Constants.GeneralStringRegularExpression)]
    public string ProviderTerms
    {
        get;
        set;
    }

    = "";
    public int Uuid
    {
        get;
        set;
    }

    [RegularExpression(Constants.GeneralStringRegularExpression)]
    public string Name
    {
        get;
        set;
    }

    = "";
    [RegularExpression(Constants.GeneralStringRegularExpression)]
    public string Path
    {
        get;
        set;
    }

    = "";
    public bool CompleteResponse
    {
        get;
        set;
    }
}

这里我看到所有值都没有被映射。例如，名称设置为空字符串，而CompleteResponse设置为false。

任何人都可以帮助我解决此问题吗？

Answer 1

尝试如下使用ProjectTo：

var countries = _dbContext.Countries
            .Where(cc => cc.IsPublished.Equals(true) && cc.LanguageId.Equals(dftLanguageId))
            .ProjectTo<CountryDTO>(_mapper.ConfigurationProvider).ToList();

注意：除非源和目标之间的属性名称相同，否则需要使用ForMember()一对一映射属性。否则，该值将不会被映射。