AutoMapper - Map 從 object 到枚舉

Question

我有這個 class：

public class EntityClass
{
    public bool IsExempt { get; set; }
    public bool IsOverdue { get; set; }
    public SourceEnum Status { get; set; }
}

這兩個枚舉：

public enum SourceEnum
{
    NotSet = 0,
    InProgress,
    Submitted,
    AssessmentComplete,
    Complete
}

[Flags]
public enum DestinationEnum
{
    None = 0,

    [Description("Exempt")]
    Exempt = 1,

    [Description("Unset")]
    Unset = 2,

    [Description("Overdue")]
    Overdue = 3,

    [Description("In Progress")]
    InProgress = 4,

    [Description("Submitted")]
    Submitted = 5,

    [Description("Conf. Pending")]
    ConfirmationPending = 6,

    [Description("Complete")]
    Completed = 7
}

我想 map 從EntityClass到DestinationEnum ，我是這樣嘗試的：

var config = new MapperConfiguration(cfg => cfg.CreateMap<EntityClass, DestinationEnum>()
                .ForMember(dest => dest, opt => opt.MapFrom(source => source.IsExempt ? DestinationEnum.Exempt : DestinationEnum.None))
                .ForMember(dest => dest, opt => opt.MapFrom(source => source.IsOverdue ? DestinationEnum.Overdue : DestinationEnum.None))

                .ForMember(dest => dest, opt => opt.MapFrom(source => source.Status == SourceEnum.InProgress ? DestinationEnum.InProgress : DestinationEnum.None))
                .ForMember(dest => dest, opt => opt.MapFrom(source => source.Status == SourceEnum.Complete ? DestinationEnum.Completed : DestinationEnum.None))
                .ForMember(dest => dest, opt => opt.MapFrom(source => source.Status == SourceEnum.AssessmentComplete ? DestinationEnum.ConfirmationPending : DestinationEnum.None))
                .ForMember(dest => dest, opt => opt.MapFrom(source => source.Status == SourceEnum.Submitted ? DestinationEnum.Submitted : DestinationEnum.None))
                .ForMember(dest => dest, opt => opt.MapFrom(source => source.Status == SourceEnum.NotSet ? DestinationEnum.Unset : DestinationEnum.None)));

var mapper = config.CreateMapper();

var entityClassObj = new EntityClass { IsExempt = true, IsOverdue = true, Status = SourceEnum.InProgress };

var result = mapper.Map<DestinationEnum>(entityClassObj);

當我運行我的代碼時，它返回：

成員的自定義配置僅支持類型上的頂級個人成員。

我從這里嘗試了解決方案，但不幸的是IncludeMembers方法不可用。 我正在使用 AutoMapper 6.0.2。

Answer 1

正如@Lucian 提到的，您需要為您的場景實現自定義類型轉換器。

解決方案 1

public class EntityClassToDestinationEnumConverter : ITypeConverter<EntityClass, DestinationEnum>
{
    public DestinationEnum Convert(EntityClass src, DestinationEnum dest, ResolutionContext context)
    {
        if (src.IsExempt)
            return DestinationEnum.Exempt;
            
        if (src.IsOverdue)
            return DestinationEnum.Overdue;
            
        switch (src.Status)
        {
            case SourceEnum.InProgress:
                return DestinationEnum.InProgress;
            case SourceEnum.Complete:
                return DestinationEnum.Completed;
            case SourceEnum.AssessmentComplete:
                return DestinationEnum.ConfirmationPending;
            case SourceEnum.Submitted:
                return DestinationEnum.Submitted;
            case SourceEnum.NotSet:
                return DestinationEnum.Unset;
        }
            
        return DestinationEnum.None;
    }
}

您的映射配置文件或MapperConfiguration到 map 從EntityClass到DestinationEnum 。

MapperConfiguration _config = new MapperConfiguration(config => 
{
    config.CreateMap<EntityClass, DestinationEnum>()
        .ConvertUsing<EntityClassToDestinationEnumConverter>();
});

---

解決方案 2

或者為沒有自定義類型解析器 class的邏輯編寫方法。

public static class Helpers
{
    public static DestinationEnum ConvertFromEntityClassToDestinationEnum(EntityClass src)
    {
        if (src.IsExempt)
                return DestinationEnum.Exempt;

        if (src.IsOverdue)
            return DestinationEnum.Overdue;

        switch (src.Status)
        {
            case SourceEnum.InProgress:
                return DestinationEnum.InProgress;
            case SourceEnum.Complete:
                return DestinationEnum.Completed;
            case SourceEnum.AssessmentComplete:
                return DestinationEnum.ConfirmationPending;
            case SourceEnum.Submitted:
                return DestinationEnum.Submitted;
            case SourceEnum.NotSet:
                return DestinationEnum.Unset;
        }

        return DestinationEnum.None;
    }   
}

MapperConfiguration _config = new MapperConfiguration(config => 
{
    config.CreateMap<EntityClass, DestinationEnum>()
        .ConvertUsing(src => Helpers.ConvertFromEntityClassToDestinationEnum(src));
});

演示解決方案 1 和 2 @ .NET 小提琴