Automapper 枚举描述属性

Automapper Enum Description Attribute

我在从枚举描述属性映射时遇到困难。我一直在寻找一个有用的例子,但运气很少。我知道还有其他一些例子,但我仍在为这种特殊情况而苦苦挣扎。

这是我的枚举:

public enum ResolveCodeEnum
{
    [Description("Resolved - Workaround")]
    ResolvedWorkaround = 1,
    [Description("Resolved - Permanently")]
    ResolvedPermanently = 2,
    [Description("Resolved - Unknown")]
    ResolvedUnkown = 3,
    [Description("Cannot Reproduce")]
    CannotReproduce = 4,
    [Description("Invalid")]
    Invalid = 5,
    [Description("Cancelled")]
    Cancelled = 6
}

这是我的枚举助手 class:

public class EnumHelper
{
    public static string GetEnumDescription(Enum value)
    {
        FieldInfo fi = value.GetType().GetField(value.ToString());

        DescriptionAttribute[] attributes =
            (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);

        if (attributes != null && attributes.Length > 0)
            return attributes[0].Description;
        else
            return value.ToString();
    }
}

我的目标是通过枚举描述属性将源映射到目标

这是我目前的映射配置:

  Mapper.CreateMap<Result, Incident>()
            .ForMember(dest => dest.Status,
                opts => opts.MapFrom(src => src.state));

这是简化的结果 class:

public class Result
{
    public string sys_id { get; set; }
    public string state { get; set; }
}

这是事件的缩写 class:

public class Incident
{
    public string Id{ get; set; }
    public string Status{ get; set; }
}

注意:Resultclass的状态属性是一个字符串

例如:

我的目标是

 Incident.Status = "Resolved - Workaround"

来自

 Result.state = "1"

我一直在努力使用我的 EnumHelper 的自动映射器语法 class

如果有人能帮我解决这个问题,我将不胜感激:)

两种方法:

  1. 内联 ResolveUsing:

        Mapper.CreateMap<Result, Incident>()
            .ForMember(
                dest => dest.Status,
                opt => opt.ResolveUsing(src =>
                {
                    var value = (ResolveCodeEnum)Enum.Parse(
                                    typeof(ResolveCodeEnum), src.state);
    
                    return EnumHelper.GetEnumDescription(value);
                }));
    
  2. 自定义ValueResolver:

    public class EnumValueResolver : ValueResolver<Result, string>
    {
        protected override string ResolveCore(Result src)
        {
            var value = (ResolveCodeEnum)Enum.Parse(typeof(ResolveCodeEnum), src.state);
    
            return EnumHelper.GetEnumDescription(value);    
        }
    }
    

    用法:

    Mapper.CreateMap<Result, Incident>()
        .ForMember(
            dest => dest.Status,
            opt => opt.ResolveUsing<EnumValueResolver>());
    

我推荐 #2,因为它更干净。