AutoMapper map from collection of IConfigurationSection with complex mapping

问题

It is my second question on the topic. My first question is here. Roman Marusyk provided an easy answer to the question. However, I have more difficult case in reality and it will get even more complex. Therefore, I need to use AutoMapper to map the config (though I would be very happy and surprised if default binding coped with this as well).
Here is my real json with models followed:

{
  "startupConfig": {
    "noSubscription": {
      "calls": [
        {
          "percentage": 30,
          "techPriority": 1,
          "timePriority": 2
        },
        {
          "percentage": 30,
          "techPriority": 1,
          "timePriority": 2
        }
      ],
      "profiles": [
        {
          "type": "startup",
          "percentage": 20,
          "techPriority": 2,
          "timePriority": 1
        }
      ]
    }
  }
}

namespace FeedService.FeedConfigurations
{
    public class FeedConfiguration
    {
        public ICollection<CallConfiguration> CallsConfig { get; set; }

        public ICollection<ProfileConfiguration> ProfilesConfig { get; set; }
    }

    public class ProfileConfiguration
    {
        public CompanyTypeEnum CompanyTypeEnum { get; set; }
        public int Percentage { get; set; }
        public int TechPriority { get; set; }
        public int TimePriority { get; set; }
    }
    public class CallConfiguration
    {
        public int Percentage { get; set; }
        public int TechPriority { get; set; }
        public int TimePriority { get; set; }
    }
}

Here, as you see I need config value of profiles:type to be mapped to property with enum type by name. Apparently, default configuration binder does not do magic for me. I also would not like to change type of the property to string or type of the value to integer. Therefore, I still need an answer for the original question for mapping with AutoMapper (where shortened example is enough to extend it for the second part).
===Original question copied for convenience===
I have the following json config file:

{
  "startupConfig": {
    "noSubscription": {
      "calls": [
        {
          "percentage": 30,
          "techPriority": 1,
          "timePriority": 2
        },
        {
          "percentage": 30,
          "techPriority": 1,
          "timePriority": 2
        }
      ]
    }
  }
}

And here is my code reading from the file:

var config = _mapper.Map<FeedConfiguration>(_configuration
    .GetSection("startupConfig").GetChildren()
    .FirstOrDefault(cc => cc.Key == "noSubscription")?.GetChildren());

However, the mapping does not work. Here is the code of mapping configuration:

CreateMap<IEnumerable<IConfigurationSection>, CallConfiguration>()
    .ForMember(cc => cc.Percentage,
        mo => mo.MapFrom(css => css.FirstOrDefault(cs => cs.Key == "percentage").Value))
    .ForMember(cc => cc.TechPriority,
        mo => mo.MapFrom(css => css.FirstOrDefault(cs => cs.Key == "techPriority").Value))
    .ForMember(cc => cc.TimePriority,
        mo => mo.MapFrom(css => css.FirstOrDefault(cs => cs.Key == "timePriority").Value));
CreateMap<IEnumerable<IConfigurationSection>, FeedConfiguration>()
    .ForMember(fc => fc.CallsConfig,
        mo => mo.MapFrom(css => css.FirstOrDefault(cs => cs.Key == "calls").GetChildren()));

Classes that I am mapping to:

namespace FeedService.FeedConfigurations
{
    public class FeedConfiguration
    {
        public ICollection<CallConfiguration> CallsConfig { get; set; }
    }

    public class CallConfiguration
    {
        public int Percentage { get; set; }
        public int TechPriority { get; set; }
        public int TimePriority { get; set; }
    }
}

And here is an exception I get:

AutoMapper.AutoMapperConfigurationException: 
Unmapped members were found. Review the types and members below.
Add a custom mapping expression, ignore, add a custom resolver, or modify the source/destination type
For no matching constructor, add a no-arg ctor, add optional arguments, or map all of the constructor parameters
=============================================================================================================
AutoMapper created this type map for you, but your types cannot be mapped using the current configuration.
IConfigurationSection -> CallConfiguration (Destination member list)
Microsoft.Extensions.Configuration.IConfigurationSection -> FeedService.FeedConfigurations.CallConfiguration (Destination member list)

Unmapped properties:
Percentage
TechPriority
TimePriority

Would be very thankful for your help!

回答1:

Your profile must look like this

namespace FeedService.FeedConfigurations
{
    public class FeedConfigurationMappingProfile : Profile
    {
        public FeedConfigurationMappingProfile()
        {
            CreateMap<IConfigurationSection, FeedConfiguration>()
                .ForMember(fc => fc.Calls,
                    mo => mo.MapFrom(fc => fc.Get<FeedConfiguration>().Calls));

            CreateMap<IConfigurationSection, CallConfiguration>()
                .ForMember(cc => cc.Percentage,
                    mo => mo.MapFrom(css => css.GetChildren().FirstOrDefault(cs => cs.Key == "percentage").Value))
                .ForMember(cc => cc.TechPriority,
                    mo => mo.MapFrom(css => css.GetChildren().FirstOrDefault(cs => cs.Key == "techPriority").Value))
                .ForMember(cc => cc.TimePriority,
                    mo => mo.MapFrom(css => css.GetChildren().FirstOrDefault(cs => cs.Key == "timePriority").Value));
        }

    }
}

and then use mapper

_mapper.Map<FeedConfiguration>(_configuration.GetSection("startupConfig:noSubscription"));

EDIT(additional option)

CreateMap<IConfigurationSection, FeedConfiguration>()
                .ForMember(fc => fc.Calls,
                    mo => mo.MapFrom(fc => fc.GetChildren().FirstOrDefault(fd=>fd.Key == "calls").GetChildren()));

来源：https://stackoverflow.com/questions/56476564/automapper-map-from-collection-of-iconfigurationsection-with-complex-mapping