using System;

using System.Collections.Generic;

using System.Linq;

​

class Identifier {

    public string Name {get; set;}

    public override bool Equals(object o) {

        return Name == ((Identifier)o).Name;

    }

    public override int GetHashCode() {

        return Name.GetHashCode();

    }

    public static bool operator==(Identifier lhs, Identifier rhs) {

        return lhs.Name == rhs.Name;

    }

    public static bool operator!=(Identifier lhs, Identifier rhs) {

        return !(lhs == rhs);

    }

}

​

class Result {

    public Identifier Id {get; set;}

    public object Whatever {get; set;}

    public override string ToString() {

        return string.Format("{{ {0} }}", Whatever);

    }

}

​

public class Program

{

    public static void Main()

    {

        IDictionary<string, ISet<Identifier>> idMap = new Dictionary<string, ISet<Identifier>> {

            {"p1100", new HashSet<Identifier> {

                new Identifier { Name = "Apple" },

                new Identifier { Name = "Orange" },

                new Identifier { Name = "Banana" }

            }},

            {"r800[1]", new HashSet<Identifier> {

                new Identifier { Name = "Foo" },

                new Identifier { Name = "Bar" }

            }}

        };

        var results = new List<Result> {

            new Result { Id = new Identifier { Name = "Orange" }, Whatever = 30 },

            new Result { Id = new Identifier { Name = "Bar" }, Whatever = 12 },

        };

#if false

        var resMap = idMap.ToDictionary(

            mapElement => mapElement.Key,

            mapElement => results.SingleOrDefault(result => mapElement.Value.Contains(result.Id))

        );

#endif

        var resMap = RemapBasedOnIdentifiers(idMap, results, result => result.Id);  

        foreach(var e in resMap)

        {

            Console.WriteLine("{0}: {1}", e.Key, e.Value);

        }

    }

    private static IDictionary<string, T> RemapBasedOnIdentifiers<T>(IDictionary<string, ISet<Identifier>> map, IEnumerable<T> en, Func<T, Identifier> idSelector)

    {

        return map.ToDictionary(

            mapElement => mapElement.Key,

            mapElement => en.SingleOrDefault(x => mapElement.Value.Contains(idSelector(x)))

        );

    }

}