private static void NewChat()
{
int creatorId = -1, member = -1;
MenuChoice NewChatMenu = MenuManager.Menu(new string[] { "Select chat creator", "Select member", "Create chat", "Exit" }, $"New chat menu\r\nCreator: {creatorId}\r\nMember: {member}");
while (NewChatMenu.choice != "Exit")
{
switch (NewChatMenu.choice_id)
{
case 0:
creatorId = SelectUser("Please select chat creator");
break;
case 1:
member = SelectUser("Please select chat member");
break;
case 2:
CreateNewChat(creatorId, member);
break;
}
MenuManager.Menu(NewChatMenu, $"New chat menu\r\nCreator: {creatorId}\r\nMember: {member}");
}
}
private static void Menu()
{
MenuChoice MainMenu = MenuManager.Menu(new string[] { "Create new chat", "Print \"accounts\" table", "Transaction", "Exit" }, "Messenger example usage Linq to Sql");
while (MainMenu.choice != "Exit")
{
switch (MainMenu.choice)
{
case "Create new chat":
NewChat();
break;
case "Print \"accounts\" table":
DispAccountsTable();
break;
case "Transaction":
Transaction();
break;
default:
break;
}
Console.ReadKey(true);
MenuManager.Menu(MainMenu);
}
}
private void EditPassword(BaseContext cntx, Users query, MenuChoice usersMenuChoice)
{
Console.Clear();
Console.WriteLine($"Current password: {cntx.Users.Where(u => u.Username == usersMenuChoice.choice).FirstOrDefault().Password}");
string newPassword = Core.GetInput("New password");
Console.WriteLine("In process . . .");
query.Password = newPassword;
}
private void EditUser(BaseContext cntx)
{
Dictionary <int, string> users = new Dictionary <int, string>();
foreach (Users cntxUser in cntx.Users)
{
users.Add(cntxUser.Id, cntxUser.Username);
}
string[] usernames = new string[users.Values.Count];
users.Values.CopyTo(usernames, 0);
MenuChoice usersMenuChoice = MenuManager.Menu(usernames, "Choose what user you want to edit");
MenuChoice EditUserMenu = MenuManager.Menu(new string[] { "Edit username", "Edit password", "Go back" });
while (EditUserMenu.choice != "Go back")
{
var query = (from e in cntx.Users
where e.Username == usersMenuChoice.choice
orderby e.Id ascending
select e).FirstOrDefault();
switch (EditUserMenu.choice)
{
case "Edit username":
EditUsername(cntx, query, usersMenuChoice);
break;
case "Edit password":
EditPassword(cntx, query, usersMenuChoice);
break;
}
try
{
cntx.SaveChanges();
Console.WriteLine(
$"{(EditUserMenu.choice == "Edit username" ? "Username" : EditUserMenu.choice == "Edit password" ? "Password" : "undefined")} for user '{usersMenuChoice.choice}' was successfully changed!"
.DrawInConsoleBox());
Console.WriteLine("Press any key to continue . . .");
}
catch (DbUpdateConcurrencyException ex)
{
Console.WriteLine("Conflict detected!".DrawInConsoleBox());
foreach (DbEntityEntry exEntry in ex.Entries)
{
var dbValues = exEntry.GetDatabaseValues();
exEntry.OriginalValues.SetValues(dbValues);
}
}
Console.ReadKey(true);
MenuManager.Menu(EditUserMenu);
}
}
private void EditUsername(BaseContext cntx, Users query, MenuChoice usersMenuChoice)
{
Console.Clear();
Console.WriteLine($"Current username: {usersMenuChoice.choice}");
string newUsername = Core.GetInput("New username");
Console.WriteLine("In process . . .");
query.Username = newUsername;
usersMenuChoice.choice = newUsername;
}
public static MenuChoice Menu(string[] choices, string title = "Make your choice")
{
var mc = new MenuChoice();
mc.choices = choices;
Console.Clear();
for (int i = 0; i < choices.Length + 1; i++)
{
Console.Write("\r\n");
}
Console.WriteLine(title.DrawInConsoleBox());
//var menu = new Menu(new string[] { "John", "Bill", "Janusz", "Grażyna", "1500", ":)" });
var menu = new MenuClass(choices);
var menuPainter = new ConsoleMenuPainter(menu);
var done = false;
do
{
menuPainter.Paint(0, 0);
var keyInfo = Console.ReadKey();
switch (keyInfo.Key)
{
case ConsoleKey.UpArrow:
menu.MoveUp();
break;
case ConsoleKey.DownArrow:
menu.MoveDown();
break;
case ConsoleKey.Enter:
done = true;
break;
}
} while (!done);
mc.choice_id = menu.SelectedIndex;
mc.choice = menu.SelectedOption;
mc.used = true;
mc.title = title;
Console.ForegroundColor = ConsoleColor.Cyan;
//Console.WriteLine("Selected option: " + (menu.SelectedOption ?? "(nothing)"));
//Console.ReadKey();
Console.ForegroundColor = ConsoleColor.Gray;
Console.BackgroundColor = ConsoleColor.Black;
Console.Clear();
//return menu.SelectedOption;
return(mc);
}
private void DeleteUser(BaseContext cntx)
{
Dictionary <int, string> users = new Dictionary <int, string>();
foreach (Users cntxUser in cntx.Users)
{
users.Add(cntxUser.Id, cntxUser.Username);
}
string[] usernames = new string[users.Values.Count];
users.Values.CopyTo(usernames, 0);
MenuChoice usersMenuChoice = MenuManager.Menu(usernames, "Choose which user you want delete");
Console.WriteLine("In process . . .");
Users cntxUsers = cntx.Users
.Where(u => u.Username == usersMenuChoice.choice)
.FirstOrDefault();
cntx.Users.Remove(cntxUsers);
cntx.SaveChanges();
Console.WriteLine($"User '{usersMenuChoice.choice}' was successfully deleted!".DrawInConsoleBox());
Console.WriteLine("Press any key to continue . . .");
}
//Отложенная загрузка (lazy loading) заключается в том, что Entity Framework автоматически загружает данные,
//при этом не загружая связанные данные. Когда потребуются связанные данные Entity Framework создаст еще один запрос к базе данных.
public static void LazyLoading(BaseContext cntx)
{
Dictionary <int, string> users = new Dictionary <int, string>();
foreach (Users cntxUser in cntx.Users)
{
users.Add(cntxUser.Id, cntxUser.Username);
}
string[] usernames = new string[users.Values.Count];
users.Values.CopyTo(usernames, 0);
MenuChoice usersMenuChoice = MenuManager.Menu(usernames, "Choose user to load");
var user = (from e in cntx.Users
where e.Username == usersMenuChoice.choice
orderby e.Id ascending
select e).FirstOrDefault();
// Попытаться загрузить связанные с ним ключи
if (user != null && user.Keys != null)
{
for (int i = 0; i < user.Keys.Count; i++)
{
DataModel.Keys key = user.Keys.ElementAt(i);
if (key != null)
{
Console.WriteLine($"Key: {key.Key}");
}
}
}
Console.WriteLine();
Console.WriteLine($"All existing keys owned by '{user.Username}'".DrawInConsoleBox());
Console.ReadKey(true);
// foreach (var key in user.Keys)
// Console.WriteLine("Key: " + key.Key);
}
private void AddKeyForUser(BaseContext cntx)
{
Dictionary <int, string> users = new Dictionary <int, string>();
foreach (Users cntxUser in cntx.Users)
{
users.Add(cntxUser.Id, cntxUser.Username);
}
string[] usernames = new string[users.Values.Count];
users.Values.CopyTo(usernames, 0);
MenuChoice usersMenuChoice = MenuManager.Menu(usernames, "Choose key owner for creating a new key");
var user = (from e in cntx.Users
where e.Username == usersMenuChoice.choice
orderby e.Id ascending
select e).FirstOrDefault();
MenuChoice KeygenMenu = MenuManager.Menu(new string[] { "Generate", "Manual input", "Exit" },
$"Key generating menu for user: {usersMenuChoice.choice}");
while (KeygenMenu.choice != "Exit")
{
switch (KeygenMenu.choice_id)
{
case 0:
AddNewKey(user, GenerateKey(), cntx);
break;
case 1:
AddNewKey(user, Core.GetInput("Enter key value"), cntx);
break;
}
Console.ReadKey(true);
MenuManager.Menu(KeygenMenu);
}
}
public static void ExplicitLoading(BaseContext cntx)
{
// Загрузить одного пользователя
Dictionary <int, string> users = new Dictionary <int, string>();
foreach (Users cntxUser in cntx.Users)
{
users.Add(cntxUser.Id, cntxUser.Username);
}
string[] usernames = new string[users.Values.Count];
users.Values.CopyTo(usernames, 0);
MenuChoice usersMenuChoice = MenuManager.Menu(usernames, "Choose user to load");
var user = (from e in cntx.Users
where e.Username == usersMenuChoice.choice
orderby e.Id ascending
select e).FirstOrDefault();
// Загрузить связанные с ним ключи с помощью явной загрузки
cntx.Entry(user)
.Collection(c => c.Keys)
.Load();
Console.WriteLine($"Keys for user {user.Username}".DrawInConsoleBox() + "\r\n");
if (user != null && user.Keys.Count >= 1)
{
foreach (var key in user.Keys)
{
if (key.OwnerId == user.Id)
{
Console.WriteLine($"Key: {key.Key}");
}
}
}
}
public void Init()
{
using (BaseContext cntx = new BaseContext())
{
//MenuChoice CodeFirstMenu = new MenuChoice();
//MenuChoice MainMenu = MenuManager.Menu(new string[] { "Create new chat", "Print \"accounts\" table", "Transaction", "Exit" }, "Messenger example usage Linq to Sql");
MenuChoice CodeFirstMenu = MenuManager.Menu(new string[]
{
"Register user", "Get users", "Edit user", "Delete user", "Add key", "Связанная загрузка", "Sim",
"Sim2", "Sim3"
});
while (CodeFirstMenu.choice != "Exit")
{
switch (CodeFirstMenu.choice)
{
case "Register user":
RegisterUser(cntx);
break;
case "Get users":
GetUsers(cntx);
break;
case "Edit user":
EditUser(cntx);
break;
case "Delete user":
DeleteUser(cntx);
break;
case "Add key":
AddKeyForUser(cntx);
break;
case "Sim":
SimpleMethod(cntx);
break;
case "Sim2":
SimpleMethodTwo(cntx);
break;
case "Sim3":
SimpleMethodTree(cntx);
break;
case "Связанная загрузка":
{
MenuChoice LoadMenu =
MenuManager.Menu(new string[]
{
"Отложенная загрузка (LazyLoad)", "Прямая загрузка (EagerLoading)",
"Явная загрузка (ExplicitLoading)", "Add new key method", "Выйти"
});
while (LoadMenu.choice != "Выйти")
{
switch (LoadMenu.choice_id)
{
case 0:
LazyLoading(cntx);
break;
case 1:
EagerLoading(cntx);
Console.WriteLine(
"Press 'y' to Count keys for each user, any other key to cancel"
.DrawInConsoleBox());
var key = Console.ReadKey(true);
if (key.KeyChar == char.Parse("y"))
{
EagerLoading_KeysCount(cntx);
}
break;
case 2:
ExplicitLoading(cntx);
break;
case 3:
//AddNewKey_method(cntx);
testUpdate(cntx);
break;
}
Console.ReadKey(true);
MenuManager.Menu(LoadMenu);
}
}
break;
}
Console.ReadKey(true);
MenuManager.Menu(CodeFirstMenu);
}
}
}
