using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var manager = new DictionaryManager(new SlDictionaryDal());

        manager.SaveTranslation("English", "French", "hello", "bonjour");

        manager.SaveTranslation("English", "Turkish", "hello", "bonjour");

    }

}

​

abstract class BaseDictionaryEntry

{

    public string Word { get; set; }

    public string Translation { get; set; }

}

​

class EnglishTurkish : BaseDictionaryEntry { }

class EnglishFrench : BaseDictionaryEntry { }

​

// Instead of SlEnglishTurkishDal

class SlDictionaryDal

{

    public void AddTranslation(BaseDictionaryEntry entity)

    {

        //_dbContext.Add(entity);

        //_dbContext.SaveChanges();

        Console.WriteLine($"Saved {entity.GetType()} to DB");

    }

}

​

// Instead of EnglishTurkishManager

class DictionaryManager

{

    private readonly SlDictionaryDal _myDal;

    public DictionaryManager(SlDictionaryDal dal)

    {

        _myDal = dal;

    }

    public void SaveTranslation(string langFrom, string langTo, string word, string trans)

    {

        var entity = DictionaryFactory.CreateEntity(langFrom, langTo, word, trans);

        _myDal.AddTranslation(entity);

    }

}

​

​

static class DictionaryFactory

{

    // Inspired from https://stackoverflow.com/a/17680332/3034273

    private static readonly Type[] DictEntryTypes =

        (from domainAssembly in AppDomain.CurrentDomain.GetAssemblies()

            from assemblyType in domainAssembly.GetTypes()

            where assemblyType.IsSubclassOf(typeof(BaseDictionaryEntry))

            select assemblyType).ToArray();

    public static BaseDictionaryEntry CreateEntity(string langFrom, string langTo, string word, string trans)

    {

        var dictLookupName = $"{langFrom}{langTo}".ToLowerInvariant();

        var matchingType = DictEntryTypes.FirstOrDefault(t => t.Name.ToLowerInvariant() == dictLookupName);

        if (matchingType == null)

            throw new InvalidOperationException($"No dictionary exists matching the language pair {langFrom}{langTo}");

        var entry = (BaseDictionaryEntry)Activator.CreateInstance(matchingType);

        entry.Word = word;

        entry.Translation = trans;

        return entry;

    }

}