demMalyhinMerkulov_shoe_store/UserMainForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace demMalyhin
{
    public partial class UserMainForm : Form
    {
        private MySqlDataAdapter dataAdapter;
        private DataTable prodTable;
        private BindingSource bindingSource = new BindingSource();
        public UserMainForm()
        {
            InitializeComponent();
            LoadProdData();
        }
        private void LoadProdData() // загрузка данных в дгв
        {
            try
            {
                DB db = new DB();
                using (MySqlConnection connection = db.getConnection())
                {
                    connection.Open();
                    string query = "SELECT article_product AS `Артикул`, product_name AS `Название товара`, price AS `Цена`, supplier_name AS `Поставщик`, Manufacturer_name AS `Производитель`, Category_name AS `Категория`, sale_percent AS `Скидка`, unit_type AS `Единица измерения`, description AS `описание`, quantity_in_stock AS `Количество на складе`, photo AS `фото` FROM products LEFT JOIN Category ON products.category_id = Category.id_Category JOIN Supplier ON products.supplier_id = Supplier.id_Supplier JOIN Manufacturer ON products.manufacturer_id = Manufacturer.id_Manufacturer";

                    dataAdapter = new MySqlDataAdapter(query, connection);
                    prodTable = new DataTable();
                    dataAdapter.Fill(prodTable);
                    DataGridViewProduct.RowTemplate.Height = 60;
                    bindingSource.DataSource = prodTable;
                    DataGridViewProduct.DataSource = bindingSource;
                    DataGridViewProduct.AllowUserToAddRows = false;
                    DataGridViewProduct.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells;
                    DataGridViewProduct.ReadOnly = true; // настройки дгв

                }
            }
            catch (MySqlException ex)
            {
                MessageBox.Show("Ошибка при подключении к базе данных или выполнении запроса: " + ex.Message);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Произошла общая ошибка: " + ex.Message);
            }

        }

        private void dataGridViewProd_Click(object sender, EventArgs e)
        {
            textBoxDesc.Text = DataGridViewProduct.CurrentRow.Cells[8].Value.ToString();
            textBoxManuf.Text = DataGridViewProduct.CurrentRow.Cells[4].Value.ToString();
            textBoxSup.Text = DataGridViewProduct.CurrentRow.Cells[3].Value.ToString();
            textBoxPrice.Text = DataGridViewProduct.CurrentRow.Cells[2].Value.ToString();
            textBoxUnit.Text = DataGridViewProduct.CurrentRow.Cells[7].Value.ToString();
            textBoxStock.Text = DataGridViewProduct.CurrentRow.Cells[9].Value.ToString();
            NameLabel.Text = DataGridViewProduct.CurrentRow.Cells[1].Value.ToString();
            CategoryLabel.Text = DataGridViewProduct.CurrentRow.Cells[5].Value.ToString();
            SaleLabel.Text = DataGridViewProduct.CurrentRow.Cells[6].Value.ToString() + "%";

            try
            {
                object photoData = DataGridViewProduct.CurrentRow.Cells[10].Value;
                if (photoData != DBNull.Value)
                {
                    byte[] imageData = (byte[])photoData;
                    if (imageData != null && imageData.Length > 0)
                    {
                        using (MemoryStream ms = new MemoryStream(imageData))
                        {
                            pictureBoxPhoto.Image = Image.FromStream(ms);
                            pictureBoxPhoto.SizeMode = PictureBoxSizeMode.Zoom;
                        }
                    }
                    else
                    {
                        pictureBoxPhoto.Image = Properties.Resources.picture;
                        pictureBoxPhoto.SizeMode = PictureBoxSizeMode.Zoom;
                    }
                }
                else
                {
                    pictureBoxPhoto.Image = Properties.Resources.picture;
                    pictureBoxPhoto.SizeMode = PictureBoxSizeMode.Zoom;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ошибка при загрузке изображения: " + ex.Message);
                pictureBoxPhoto.Image = Properties.Resources.picture;
                pictureBoxPhoto.SizeMode = PictureBoxSizeMode.Zoom;
            }
            try
            {
                var currentRow = DataGridViewProduct.CurrentRow;
                if (currentRow == null) return;

                Color defaultColor = SystemColors.Window;
                textBoxPrice.BackColor = defaultColor;
                textBoxSup.BackColor = defaultColor;
                textBoxManuf.BackColor = defaultColor;
                textBoxStock.BackColor = defaultColor;
                textBoxPrice.ForeColor = Color.Black;
                textBoxPrice.Font = new Font(textBoxPrice.Font, FontStyle.Regular);
                textBoxFP.Text = "";
                decimal originalPrice = 0m;
                int salePercent = 0;
                int quantityInStock = 0;

                decimal.TryParse(currentRow.Cells[2].Value?.ToString(), out originalPrice);
                int.TryParse(currentRow.Cells[6].Value?.ToString(), out salePercent);
                int.TryParse(currentRow.Cells[9].Value?.ToString(), out quantityInStock);

                if (salePercent > 15)
                {
                    Color highDiscountColor = ColorTranslator.FromHtml("#2E8B57");
                    textBoxPrice.BackColor = highDiscountColor;
                    textBoxSup.BackColor = highDiscountColor;
                    textBoxManuf.BackColor = highDiscountColor;
                    textBoxStock.BackColor = highDiscountColor;
                    textBoxDesc.BackColor = highDiscountColor;
                    textBoxFP.BackColor = highDiscountColor;
                    textBoxUnit.BackColor = highDiscountColor;
                    panel3.BackColor = highDiscountColor;

                }

                else
                {
                    textBoxPrice.BackColor = Color.White;
                    textBoxSup.BackColor = Color.White;
                    textBoxManuf.BackColor = Color.White;
                    textBoxStock.BackColor = Color.White;
                    textBoxDesc.BackColor = Color.White;
                    textBoxFP.BackColor = Color.White;
                    textBoxUnit.BackColor = Color.White;
                    panel3.BackColor = Color.White;
                }

                if (salePercent > 0)
                {
                    decimal finalPrice = originalPrice * (1 - (decimal)salePercent / 100);
                    textBoxPrice.Text = $"{originalPrice:N2}";
                    textBoxPrice.ForeColor = Color.Red;
                    textBoxPrice.Font = new Font(textBoxPrice.Font, FontStyle.Strikeout);
                    textBoxFP.Text = $"{finalPrice:N2}";
                    textBoxFP.ForeColor = Color.Black;
                    textBoxFP.Font = new Font(textBoxFP.Font, FontStyle.Regular);
                }
                else
                {
                    textBoxPrice.Text = $"{originalPrice:N2}";
                }
                if (quantityInStock <= 0)
                {
                    textBoxStock.BackColor = Color.LightBlue;
                }

            }
            catch (Exception ex)
            {
                MessageBox.Show("Ошибка при обработке данных товара: " + ex.Message);
            }
        }

        private void btnBack_Click(object sender, EventArgs e)
        {
            this.Hide();
            LoginForm log = new LoginForm();
            log.Show();
        }

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

        private void UserMainForm_Load(object sender, EventArgs e)
        {
            labelFIO.Text = LoginForm.ClientSurname + " " + LoginForm.ClientName + " " + LoginForm.ClientPatronymic;
        }
    }
}