Second try

FifthLesson/EnglishLessons/EnglishLessons.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{DD163CDC-E328-436C-B273-63767E38334A}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>EnglishLessons</RootNamespace>
+    <AssemblyName>EnglishLessons</AssemblyName>
+    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="DnsClient, Version=1.0.7.0, Culture=neutral, PublicKeyToken=4574bb5573c51424, processorArchitecture=MSIL">
+      <HintPath>..\packages\DnsClient.1.0.7\lib\net45\DnsClient.dll</HintPath>
+    </Reference>
+    <Reference Include="MongoDB.Bson, Version=2.7.1.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\MongoDB.Bson.2.7.1\lib\net45\MongoDB.Bson.dll</HintPath>
+    </Reference>
+    <Reference Include="MongoDB.Driver, Version=2.7.1.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\MongoDB.Driver.2.7.1\lib\net45\MongoDB.Driver.dll</HintPath>
+    </Reference>
+    <Reference Include="MongoDB.Driver.Core, Version=2.7.1.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\MongoDB.Driver.Core.2.7.1\lib\net45\MongoDB.Driver.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="Newtonsoft.Json, Version=11.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\packages\Newtonsoft.Json.11.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Buffers, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Buffers.4.3.0\lib\netstandard1.1\System.Buffers.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Core" />
+    <Reference Include="System.Runtime.InteropServices.RuntimeInformation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Runtime.InteropServices.RuntimeInformation.4.0.0\lib\net45\System.Runtime.InteropServices.RuntimeInformation.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Generator.cs" />
+    <Compile Include="IUserRepository.cs" />
+    <Compile Include="IWordRepository.cs" />
+    <Compile Include="Memory.cs" />
+    <Compile Include="MongoUserRepository.cs" />
+    <Compile Include="MongoWordRepository.cs" />
+    <Compile Include="RepWord.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Session.cs" />
+    <Compile Include="User.cs" />
+    <Compile Include="UserWord.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

FifthLesson/EnglishLessons/Generator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EnglishLessons
+{
+    public class Generator
+    {
+        public List<RepWord> Start(int count, User user)
+        {
+            List<RepWord> toRand = user.ShowInProgress();
+            Random rnd = new Random();
+            List<RepWord> toShow = new List<RepWord>();
+            if (count > toRand.Count) throw new InvalidOperationException();
+            for (int i = 0; i < count; i++)
+            {
+                int ind = rnd.Next(toRand.Count);
+                toShow.Add(toRand[ind]);
+                toRand.RemoveAt(ind);
+            }
+
+            toRand = user.ShowInProgress();
+
+            for (int i = 0; i < count; i++)
+            {
+                if (rnd.Next(2) == 1)
+                {
+                    string NewRus = "";
+                    Random NewInd = new Random();
+                    do
+                        NewRus = toRand[NewInd.Next(toRand.Count())].Rus;
+                    while (NewRus == toShow[i].Rus);
+
+                    toShow[i].Rus = NewRus;
+                }
+            }
+
+            return toRand;
+        }
+    }
+}

FifthLesson/EnglishLessons/IMemoryUse.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EnglishLessons
+{
+    interface IMemoryUse
+    {
+    }
+}

FifthLesson/EnglishLessons/IUserRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EnglishLessons
+{
+    public interface IUserRepository
+    {
+        User LoadUser(Guid id);
+
+        void SaveUser(User user);
+    }
+}

FifthLesson/EnglishLessons/IWordRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EnglishLessons
+{
+    public interface IWordRepository
+    {
+        RepWord LoadWord();
+
+        void SaveWord(RepWord repword);
+    }
+}

FifthLesson/EnglishLessons/Memory.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using System.IO;
+
+namespace EnglishLessons
+{
+    public class Memory
+    {
+        public void Save(Session session)
+        {
+            string serialized = JsonConvert.SerializeObject(session);
+            File.Create("FooBar.txt");
+            File.WriteAllText("FooBar.txt", serialized);
+        }
+
+        public Session Load()
+        {
+            string deserialized = File.ReadAllText("FooBar.txt");
+            return JsonConvert.DeserializeObject<Session>(deserialized);
+        }
+    }
+}

FifthLesson/EnglishLessons/MongoUserRepository.cs

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+using MongoDB.Bson.Serialization;
+using MongoDB.Driver;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EnglishLessons
+{
+    public class MongoUserRepository : IUserRepository
+    {
+        private readonly IMongoCollection<User> users;
+        static MongoUserRepository()
+        {
+            BsonClassMap.RegisterClassMap<User>(map =>
+            {
+                map.AutoMap();
+                map.MapMember(user => user.Name);
+                map.MapMember(user => user.Id);
+                map.MapMember(user => user._learned);
+                map.MapMember(user => user._inProgress);
+
+            });
+        }
+        public MongoUserRepository(string connectionString)
+        {
+            var mongoClient = new MongoClient(connectionString);
+            var database = mongoClient.GetDatabase("LOD");
+            users = database.GetCollection<User>("MapkUsers");
+        }
+
+        public User LoadUser(Guid id)
+        {
+            return users.Find(user => user.Id == id).FirstOrDefault();
+        }
+
+        public void SaveUser(User user)
+        {
+            users.InsertOne(user);
+        }
+    }
+}

FifthLesson/EnglishLessons/MongoWordRepository.cs

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+using MongoDB.Bson.Serialization;
+using MongoDB.Driver;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EnglishLessons
+{
+    public class MongoWordRepository : IWordRepository
+    {
+        private readonly IMongoCollection<RepWord> words;
+        static MongoWordRepository()
+        {
+            BsonClassMap.RegisterClassMap<RepWord>(map =>
+            {
+                map.AutoMap();
+                map.MapMember(word => word.Eng);
+                map.MapMember(word => word.Rus);
+            });
+        }
+        public MongoWordRepository(string connectionString)
+        {
+            var mongoClient = new MongoClient(connectionString);
+            var database = mongoClient.GetDatabase("LOD");
+            words = database.GetCollection<RepWord>("MapkWords");
+        }
+
+        public RepWord LoadWord()
+        {
+            return words.Find(word => word.Eng != "123").FirstOrDefault();//добавить рандом (?)
+        }
+
+        public void SaveWord(RepWord repword)
+        {
+            words.InsertOne(repword);
+        }
+    }
+}

FifthLesson/EnglishLessons/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// Общие сведения об этой сборке предоставляются следующим набором
+// набора атрибутов. Измените значения этих атрибутов, чтобы изменить сведения,
+// связанные со сборкой.
+[assembly: AssemblyTitle("EnglishLessons")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("EnglishLessons")]
+[assembly: AssemblyCopyright("Copyright ©  2018")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Установка значения False для параметра ComVisible делает типы в этой сборке невидимыми
+// для компонентов COM. Если необходимо обратиться к типу в этой сборке через
+// COM, задайте атрибуту ComVisible значение TRUE для этого типа.
+[assembly: ComVisible(false)]
+
+// Следующий GUID служит для идентификации библиотеки типов, если этот проект будет видимым для COM
+[assembly: Guid("dd163cdc-e328-436c-b273-63767e38334a")]
+
+// Сведения о версии сборки состоят из следующих четырех значений:
+//
+//      Основной номер версии
+//      Дополнительный номер версии
+//   Номер сборки
+//      Редакция
+//
+// Можно задать все значения или принять номер сборки и номер редакции по умолчанию.
+// используя "*", как показано ниже:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

FifthLesson/EnglishLessons/RepWord.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+
+namespace EnglishLessons
+{
+    public class RepWord
+    {
+        public string Rus { get; set; }
+        public string Eng { get; }
+
+        public RepWord(string eng, string rus)
+        {
+            Rus = rus;
+            Eng = eng;
+        }
+    }
+}

FifthLesson/EnglishLessons/Session.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EnglishLessons
+{
+    public class Session
+    {
+        private List<RepWord> _allWords { get; set; }
+        private List<User> _users { get; set; }
+
+        private void AddUser(User user)
+        {
+            _users.Add(user);
+        }
+
+        private void AddWord(RepWord word)
+        {
+            _allWords.Add(word);
+        }
+
+        private bool CheckWord(RepWord word)
+        {
+            return _allWords.Contains(word);
+        }
+
+        public void Registration(string name, Guid id)
+        {
+            Dictionary<string, UserWord> toReg = new Dictionary<string, UserWord>();
+            if (_allWords.Count < 10) throw new InvalidOperationException();
+            for (int i = 0; i < 10; i++)
+            {
+                toReg.Add(_allWords[i].Rus, new UserWord(false, 0, _allWords[i].Eng, _allWords[i].Rus));
+            }
+            AddUser(new User(name, id, new List<RepWord>(), toReg));
+        }
+
+        public void Start(User user, int wordCount)
+        {
+            Generator Gen = new Generator();
+            List<RepWord> toWork = Gen.Start(wordCount, user);
+            foreach (RepWord a in toWork)
+            {
+                bool UserAnswer = true; //вместо true ответ пользователя
+                if (CheckWord(a) == UserAnswer)
+                {
+                    user.MarkAsLearned(a.Eng);
+                }
+            }
+
+        }
+    }
+}