我一直在使用AutoMapper一段时间了,遇到了我需要将对象映射到另一个对象的问题(如下所示)。
型号:
public Guid guid { get; set; }
public string Status { get; set; }
使用DTO转移:
public Guid guid { get; set; }
public Status Status { get; set; }
枚举将包含:
public enum Status {
Example,
AnotherExample,
PossibleExample
}
我已经设法在模型和DTO之间进行转换,但是,转换是否处理了在DTO内的枚举中找不到通过Model对象传入的字符串的情况?我试过这个,发现转换时收到错误:
SomeExample ---> System.ArgumentException: Requested value 'SomeExample' was not found.
at System.Enum.EnumResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument)
at System.Enum.TryParseEnum(Type enumType, String value, Boolean ignoreCase, EnumResult& parseResult)
at System.Enum.Parse(Type enumType, String value, Boolean ignoreCase)
at AutoMapper.Mappers.EnumMapper.Map(ResolutionContext context)
at AutoMapper.MappingEngine.Map(ResolutionContext context)
传递错误字符串的示例:
{
"guid": "42c1f9f7-a375-4a65-b883-e6e9717d18fe",
"Status": "SomeExample"
}
如果我使用了Enum.Parse,我会假设如果它无法解析字符串,它会将它默认为枚举中的顶部索引吗?
编辑:这是用于将字符串转换为枚举
的映射CreateMap<Model, Dto>()
.ForMember(d => d.Status, op => op.MapFrom(o => o.Status));
答案 0 :(得分:0)
您可以指定自己的自定义解析程序,并确保它可以安全处理。
http://automapper.readthedocs.io/en/latest/Custom-type-converters.html
.ForMember(x => x.someEnumValue, opt => opt.ResolveUsing(src =>
{
if (Enum.TryParse(typeof(Status), src.someStringValue, out var parsedResult))
return parsedResult;
return Status.Example;
}))
使用AutoMapper配置文件的完整工作示例:
namespace MyProject.Domain.Mapping
{
public enum Status
{
Unknown,
Example,
AnotherExample,
PossibleExample
}
public class RecordPost
{
public Status Status { get; set; }
}
public class RecordDto
{
public string Status { get; set; }
}
public static class AutoMapperConfiguration
{
public static void Configure()
{
Mapper.Initialize(cfg =>
{
cfg.AddProfile(new RecordProfile());
});
Mapper.AssertConfigurationIsValid();
}
}
public class RecordProfile : Profile
{
public RecordProfile()
{
CreateMap<RecordPost, RecordDto>()
.ForMember(x => x.Status, opt => opt.MapFrom(src => src.Status.ToString()));
CreateMap<RecordDto, RecordPost>()
.ForMember(x => x.Status, opt => opt.ResolveUsing(src =>
{
if (!Enum.TryParse(typeof(Status), src.Status, out var parsedResult))
return Status.Unknown;
return parsedResult;
}));
}
}
}