demMalyhinMerkulov_shoe_store/LoginForm.cs

using System.Data.SqlClient;
using System.Data;
using System.Windows.Forms;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using MySqlX.XDevAPI;
using static System.Windows.Forms.VisualStyles.VisualStyleElement.Button;
using System.Diagnostics.Eventing.Reader;

namespace demMalyhin
{
    public partial class LoginForm : Form
    {
        public static string ClientSurname { get; private set; }
        public static string ClientName { get; private set; }
        public static string ClientPatronymic { get; private set; }
        public LoginForm()
        {
            InitializeComponent();
            loginField.KeyPress += TextBox_KeyPress_NoSpaces;
            passField.KeyPress += TextBox_KeyPress_NoSpaces;
        }
        private void TextBox_KeyPress_NoSpaces(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == ' ')
            {
                e.Handled = true;
            }
        }

        private void label2_Click(object sender, EventArgs e)
        {
        }

        private void ButtonLogin_Click(object sender, EventArgs e)
        {
            string loginUser = loginField.Text;
            string passUser = passField.Text;

            if (string.IsNullOrWhiteSpace(loginField.Text))
            {
                MessageBox.Show("Введите логин.", "Информация", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            if (string.IsNullOrWhiteSpace(passField.Text))
            {
                MessageBox.Show("Введите пароль.", "Информация", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            DB db = new DB();

            using (MySqlConnection connection = db.getConnection())
            {
                DataTable table = new DataTable();
                MySqlDataAdapter adapter = new MySqlDataAdapter();
                MySqlCommand command = new MySqlCommand("SELECT RoleID, login, Surname, Name, Patronymic FROM users WHERE login = @uL AND password = @uP", connection);
                command.Parameters.Add("@uL", MySqlDbType.VarChar).Value = loginUser;
                command.Parameters.Add("@uP", MySqlDbType.VarChar).Value = passUser;

                adapter.SelectCommand = command;

                try
                {
                    connection.Open(); 
                    adapter.Fill(table);

                    if (table.Rows.Count == 1)
                    {
                        string roleID = table.Rows[0]["RoleID"].ToString(); 
                        string userLogin = table.Rows[0]["login"].ToString();

                        ClientSurname = Convert.ToString(table.Rows[0]["Surname"]);
                        ClientName = Convert.ToString(table.Rows[0]["Name"]);
                        ClientPatronymic = Convert.ToString(table.Rows[0]["Patronymic"]);

                        switch (roleID)
                        {
                            case "1": 
                                MessageBox.Show("Вы авторизовались под ролью: Admin. Ваше фио: " + ClientSurname + " " + ClientName + " " + ClientPatronymic);
                                this.Hide();
                                AdmMainForm adm = new AdmMainForm();
                                adm.Show();
                                break;

                            case "2":
                                MessageBox.Show("Авторизация успешна, добро пожаловать! Вы авторизовались под ролью: Manager");
                                this.Hide();
                                ManagerMainForm usManager = new ManagerMainForm(); 
                                usManager.Show();
                                break;

                            case "3": 
                                MessageBox.Show("Авторизация успешна, добро пожаловать! Вы авторизовались под ролью: Authorized Client");
                                this.Hide();
                                UserMainForm usClient = new UserMainForm();
                                usClient.Show();
                                break;
                        }
                    }
                    else
                    {
                        MessageBox.Show("Введен неверный логин или пароль", "Ошибка авторизации", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    }
                }
                catch (MySqlException ex)
                {
                    MessageBox.Show("Ошибка подключения к базе данных или выполнения запроса: " + ex.Message, "Ошибка БД", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                finally
                {
                    db.closeConnection();
                }
            }
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void regLabel_Click(object sender, EventArgs e)
        {
            this.Hide();
            ManagerMainForm regForm = new ManagerMainForm();
            regForm.Show();
        }

        private void closeBtn_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized;
        }

        private void checkBoxPass_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBoxPass.Checked)
            {
                passField.UseSystemPasswordChar = false;
            }
            else
            {
                passField.UseSystemPasswordChar = true;
            }
        }

        private void label1_Click(object sender, EventArgs e)
        {
            this.Hide();
            GuestMainForm guest = new GuestMainForm();
            guest.Show();
         
        }

        private void LoginForm_Load(object sender, EventArgs e)
        {
            pictureBox1.Image = Properties.Resources.Icon1;
        }
    }
}