automapper map collections with action

automapper map collections with action

我有以下代码

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;

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; }

}

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);

  }

}

var configuration = new MapperConfiguration(cfg => cfg.CreateMap<Configuration, ConfigurationDto>()

         .ForMember(dest => dest.FilePath, opt => opt.MapFrom<CustomResolver>()));

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？

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;

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; }

}

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);

  }

}

var configuration = new MapperConfiguration(cfg => cfg.CreateMap<Configuration, ConfigurationDto>()

         .ForMember(dest => dest.FilePath, opt => opt.MapFrom<CustomResolver>()));

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。

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;

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; }

}

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);

  }

}

var configuration = new MapperConfiguration(cfg => cfg.CreateMap<Configuration, ConfigurationDto>()

         .ForMember(dest => dest.FilePath, opt => opt.MapFrom<CustomResolver>()));

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。

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;

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; }

}

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);

  }

}

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