关于 c#:automapper map collections with action

automapper map collections with action

我有以下代码

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IList<ConfigurationDto> result = new List<ConfigurationDto>();
foreach (var configuration in await configurations.ToListAsync())
{
var configurationDto = _mapper.Map<ConfigurationDto>(configuration);
configurationDto.FilePath = _fileStorage.GetShortTemporaryLink(configuration.FilePath);
result.Add(configurationDto);
}
return result;

如果是 foreach，我该如何使用 automapper？我可以映射集合，但是如何为每个项目调用 _fileStorage.GetShortTemporaryLink？

我看过 AfterMap 但我不知道如何从 dest 获取 FilePath 并将其一一映射到 src 。我可以为此使用自动映射器吗？

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public class ConfigurationDto
{
public int Id { get; set; }
public string Name { get; set; }
public string Version { get; set; }
public DateTime CreateDateTime { get; set; }
public long Size { get; set; }
public string FilePath { get; set; }
}

您可以使用 IValueResolver 接口来配置您的地图以从函数映射属性。类似于下面的示例。

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public class CustomResolver : IValueResolver<Configuration, ConfigurationDto, string>
{
private readonly IFileStorage fileStorage;

public CustomResolver(IFileStorage fileStorage)
{
_fileStorage= fileStorage;
}

public int Resolve(Configuration source, ConfigurationDto destination, string member, ResolutionContext context)
{
return _fileStorage.GetShortTemporaryLink(source.FilePath);
}
}

Once we have our IValueResolver implementation, wea€?ll need to tell AutoMapper to use this custom value resolver when resolving a specific destination member. We have several options in telling AutoMapper a custom value resolver to use, including:

MapFrom

MapFrom(typeof(CustomValueResolver))

MapFrom(aValueResolverInstance)

然后您应该配置您的地图以使用自定义解析器来映射 ConfigurationDto 上的 FilePath 属性。

1 2	var configuration = new MapperConfiguration(cfg => cfg.CreateMap<Configuration, ConfigurationDto>() .ForMember(dest => dest.FilePath, opt => opt.MapFrom<CustomResolver>()));

您可以在此链接中查看有关自定义值解析器的更多信息：http://docs.automapper.org/en/stable/Custom-value-resolvers.html