Добавьте файлы проекта.

123.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.11.35312.102
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Demo", "123\Demo.csproj", "{5A6EDB7C-E5C5-4FCD-B6CE-7E131BD9EDA3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5A6EDB7C-E5C5-4FCD-B6CE-7E131BD9EDA3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5A6EDB7C-E5C5-4FCD-B6CE-7E131BD9EDA3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5A6EDB7C-E5C5-4FCD-B6CE-7E131BD9EDA3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5A6EDB7C-E5C5-4FCD-B6CE-7E131BD9EDA3}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {B3D7FA9B-E7AA-4A2B-8D13-416D51577CB6}
+	EndGlobalSection
+EndGlobal

123/Data/LocalData/Entity/Group.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.Data.LocalData.Entity
+{
+    public class GroupLocalEntity
+    {
+        public int ID { get; set; }
+        public required string Name { get; set; }
+    }
+}

123/Data/LocalData/Entity/Presence.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.Data.LocalData.Entity
+{
+    public class PresenceLocalEntity
+    {
+         public required Guid UserGuid { get; set; }
+        public bool IsAttedance { get; set; } = true;
+        public required DateOnly Date { get; set; }
+
+        public required int LessonNumber { get; set; }
+    }
+}

123/Data/LocalData/Entity/User.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.Data.LocalData.Entity
+{
+    public class UserLocalEntity : IEquatable<UserLocalEntity>
+    {
+        public required string UserFIO { get; set; }
+        public Guid UserGuid { get; set; }
+
+        public required int GroupID { get; set; }
+        public bool Equals(UserLocalEntity? other)
+        {
+            if (other == null) return false;
+            return this.UserGuid.Equals(other.UserGuid);
+        }
+    }
+}

123/Data/LocalData/LocalStaticData.cs

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+using _123.Data.LocalData.Entity;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.Data.LocalData
+{
+    public class LocalStaticData
+    {
+        public static List<GroupLocalEntity> groups => new List<GroupLocalEntity>
+        {
+            new GroupLocalEntity{ ID = 1, Name = "ИП1-21"},
+            new GroupLocalEntity{ ID = 2, Name = "ИП1-22"},
+            new GroupLocalEntity{ ID = 3, Name = "ИП1-23"},
+        };
+        public static List<UserLocalEntity> users => new List<UserLocalEntity>
+        {
+            new UserLocalEntity{UserGuid=Guid.NewGuid(), UserFIO = "RandomFio", GroupID = 1 },
+            new UserLocalEntity{UserGuid=Guid.NewGuid(), UserFIO = "RandomFio1", GroupID = 2 },
+            new UserLocalEntity{UserGuid=Guid.NewGuid(), UserFIO = "RandomFio2", GroupID = 3 },
+            new UserLocalEntity{UserGuid=Guid.NewGuid(), UserFIO = "RandomFio3", GroupID = 1 },
+            new UserLocalEntity{UserGuid=Guid.NewGuid(), UserFIO = "RandomFio4", GroupID = 2 },
+            new UserLocalEntity{UserGuid=Guid.NewGuid(), UserFIO = "RandomFio5", GroupID = 3 },
+        };
+        public static List<PresenceLocalEntity> presences => new List<PresenceLocalEntity>
+        {
+
+        };
+    }
+}

123/Data/ReportsHistory/GroupRepositoty.cs

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+using _123.Data.LocalData.Entity;
+using _123.Data.LocalData;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.Data.ReportsHistory
+{
+
+        public class GroupRepositoryImpl
+        {
+            public List<GroupLocalEntity> GetAllGroups() => LocalStaticData.groups;
+
+        public GroupLocalEntity? UpdateGroup(GroupLocalEntity groupUpdateLocalEntity)
+        {
+            GroupLocalEntity? groupLocal = GetAllGroups()
+                .Where(x => x.ID == groupUpdateLocalEntity.ID).FirstOrDefault();
+            if (groupLocal == null) return null;
+            groupLocal.ID = groupUpdateLocalEntity.ID;
+            groupLocal.Name = groupUpdateLocalEntity.Name;
+            return groupLocal;
+        }
+        }
+    }

123/Data/ReportsHistory/UserRepositoty.cs

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+using _123.Data.LocalData;
+using _123.Data.LocalData.Entity;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+
+namespace _123.Data.ReportsHistory
+{
+    public class UserRepositoryImpl
+    {
+        public UserRepositoryImpl()
+        {
+
+            GetAllUsers = LocalStaticData.users;
+        }
+        public List<UserLocalEntity> GetAllUsers
+        { get; set; }
+
+        public bool RemoveUserByGuid(Guid userGuid)
+        {
+            UserLocalEntity? userLocal = GetAllUsers
+                .Where(x => x.UserGuid == userGuid).FirstOrDefault();
+            if (userLocal == null) return false;
+
+            return GetAllUsers.Remove(userLocal);
+        }
+
+        public UserLocalEntity? GetUserByGuid(Guid userGuid)
+        {
+            UserLocalEntity? userLocal = GetAllUsers
+                    .Where(x => x.UserGuid == userGuid).FirstOrDefault();
+            if (userLocal == null) return null;
+
+            return userLocal;
+        }
+
+        public UserLocalEntity? UpdateUser(UserLocalEntity userUpdateLocalEnity)
+        {
+            UserLocalEntity? userLocal = GetAllUsers
+                    .Where(x => x.UserGuid == userUpdateLocalEnity.UserGuid).FirstOrDefault();
+            if (userLocal == null) return null;
+            userLocal.UserFIO = userUpdateLocalEnity.UserFIO;
+            userLocal.GroupID = userUpdateLocalEnity.GroupID;
+            return userLocal;
+
+        }
+    }
+}

123/Demo.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>_123</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Data\RemoteData\" />
+  </ItemGroup>
+
+</Project>

123/Domain/Models/Group.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.Domain.Models
+{
+    public class Group
+    {
+        public int ID { get; set; }
+        public required string Name { get; set; }
+    }
+}

123/Domain/Models/Presence.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.Domain.Models
+{
+    public class Presence
+    {
+        public DateOnly Date { get; set; }
+        public int ClassNum { get; set; }
+        public bool IsAttedance { get; set; }
+        public required User User { get; set; }
+    }
+}

123/Domain/Models/User.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.Domain.Models
+{
+    public class User
+    {
+        public required string UserFIO { get; set; }
+        public Guid UserGuid { get; set; }
+
+        public required Group UserGroup { get; set; }
+    }
+}

123/Domain/UseCase/GroupUseCase.cs

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+using _123.Data.ReportsHistory;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using _123.Domain.Models;
+using _123.Data.LocalData.Entity;
+
+namespace _123.Domain.UseCase
+{
+    public class GroupUseCase
+    {
+        private GroupRepositoryImpl _repositoryGroupImpl;
+        public GroupUseCase(GroupRepositoryImpl repositoryGroupImpl)
+        {
+            _repositoryGroupImpl = repositoryGroupImpl;
+        }
+        public List<Group> GetAllGroups() => _repositoryGroupImpl.GetAllGroups()
+             .Select(it => new Group { ID = it.ID, Name = it.Name }).ToList();
+
+        public Group UpdateGroupName(Group grou)
+        {
+            GroupLocalEntity groupLocalEntity = new GroupLocalEntity { ID = grou.ID, Name = grou.Name };
+            GroupLocalEntity? result = _repositoryGroupImpl.UpdateGroup(groupLocalEntity);
+            if (result == null) throw new Exception("");
+            Group? group = GetAllGroups().FirstOrDefault(it => it.ID == result!.ID);
+            if (group == null) throw new Exception("");
+            return new Group { ID = group.ID, Name = group.Name };
+        }
+    }
+    
+}

123/Domain/UseCase/UserUseCase.cs

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+using _123.Data.LocalData.Entity;
+using _123.Data.ReportsHistory;
+using _123.Domain.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.Domain.UseCase
+{
+    public class UserUseCase
+    {
+        private UserRepositoryImpl _repositoryUserImpl;
+        private GroupRepositoryImpl _repositoryGroupImpl;
+
+        public UserUseCase(UserRepositoryImpl repositoryImpl, GroupRepositoryImpl repositoryGroupImpl)
+        {
+            _repositoryUserImpl = repositoryImpl;
+            _repositoryGroupImpl = repositoryGroupImpl;
+        }
+
+        public List<Group> GetAllGroups() => _repositoryGroupImpl.GetAllGroups()
+              .Select(it => new Group { ID = it.ID, Name = it.Name }).ToList();
+        public List<User> GetAllUsers() => _repositoryUserImpl.GetAllUsers
+              .Join(_repositoryGroupImpl.GetAllGroups(),
+              user => user.GroupID,
+              group => group.ID,
+              (user, group) =>
+              new User
+              {
+                  UserFIO = user.UserFIO,
+                  UserGuid = user.UserGuid,
+                  UserGroup = new Group { ID = group.ID, Name = group.Name }
+              }
+            ).ToList();
+
+        public bool RemoveUserByGuid(Guid userGuid)
+        {
+            return _repositoryUserImpl.RemoveUserByGuid(userGuid);
+        }
+        public User UpdateUser(User user)
+        {
+            UserLocalEntity userLocalEnity = new UserLocalEntity { UserFIO = user.UserFIO, GroupID = user.UserGroup.ID, UserGuid = user.UserGuid };
+            UserLocalEntity? result = _repositoryUserImpl.UpdateUser(userLocalEnity);
+            if (result == null) throw new Exception("");
+            Group? group = GetAllGroups().FirstOrDefault(it => it.ID == result!.GroupID);
+            if (group == null) throw new Exception("");
+            return new User { UserFIO = user.UserFIO, UserGuid = user.UserGuid, UserGroup = group };
+        }
+
+    }
+}

123/Program.cs

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+using _123.Data.ReportsHistory;
+using _123.Domain.UseCase;
+using _123.UI;
+
+GroupRepositoryImpl groupRepositoryImpl = new GroupRepositoryImpl();
+UserRepositoryImpl userRepositoryImpl = new UserRepositoryImpl();
+UserUseCase userUseCase = new UserUseCase(userRepositoryImpl, groupRepositoryImpl);
+GroupUseCase groupUseCase = new GroupUseCase(groupRepositoryImpl);
+
+MainMenuUI mainMenuUI = new MainMenuUI(userUseCase, groupUseCase);

123/UI/GroupConsole.cs

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+using _123.Domain.UseCase;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+namespace _123.UI
+{
+    public class GroupConsoleUI
+    {
+        GroupUseCase _groupUseCase;
+        public GroupConsoleUI(GroupUseCase groupUseCase)
+        {
+            _groupUseCase = groupUseCase;
+        }
+        public void DisplayAllGroups()
+        {
+            StringBuilder groupOutput = new StringBuilder();
+            foreach (var group in _groupUseCase.GetAllGroups())
+            {
+                groupOutput.AppendLine($"{group.ID}\t{group.Name}");
+            }
+            Console.WriteLine(groupOutput);
+        }
+    }
+}

123/UI/MainMenu.cs

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+using _123.Domain.UseCase;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.UI
+{
+    public class MainMenuUI
+    {
+
+        UserConsoleUI _userConsoleUI;
+
+        GroupConsoleUI _groupConsoleUI;
+
+        public MainMenuUI(UserUseCase userUseCase, GroupUseCase groupUseCase)
+        {
+            _userConsoleUI = new UserConsoleUI(userUseCase);
+            _groupConsoleUI = new GroupConsoleUI(groupUseCase);
+
+            DisplayMenu();
+
+        }
+
+        private void DisplayMenu()
+        {
+            while (true)
+            {
+                switch (Console.ReadLine())
+                {
+                    case "1": _userConsoleUI.DisplayAllUsers(); break;
+                    case "2": _userConsoleUI.RemoveUserByGuid(Guid.Parse(Console.ReadLine())); break;
+                    case "3": _groupConsoleUI.DisplayAllGroups(); break;
+
+                    default:
+                        DisplayMenu();
+                        break;
+                }
+
+            }
+        }
+
+    }
+}

123/UI/UserConsole.cs

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+using _123.Domain.UseCase;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _123.UI
+{
+    public class UserConsoleUI
+    {
+        UserUseCase _userUseCase;
+        public UserConsoleUI(UserUseCase userUseCase)
+        {
+            _userUseCase = userUseCase;
+        }
+
+        public void RemoveUserByGuid(Guid guidUser)
+        {
+
+            string output = _userUseCase.RemoveUserByGuid(guidUser) ? "Пользователь удален" : "Пользователь не удален";
+            Console.WriteLine(output);
+        }
+
+        public void DisplayAllUsers()
+        {
+            StringBuilder userOutput = new StringBuilder();
+            foreach (var user in _userUseCase.GetAllUsers())
+            {
+                userOutput.AppendLine($"{user.UserGuid}\t{user.UserFIO}\t{user.UserGroup.Name}");
+            }
+            Console.WriteLine(userOutput);
+        }
+
+    }
+}