![](img/2.png)
![](img/3.jfif)
![](img/4.jfif)
```MainWindow.xaml.cs```
```
using sql_pagining.models;
using System.ComponentModel;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Dapper;
using MySqlConnector;
using sql_pagining.Windows;

namespace sql_pagining
{
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private void Invalidate()
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("productList"));
        }
        public int productsSelectedCount = 0;
        public decimal Result;
        private void CostChangeButton_Click(object sender, RoutedEventArgs e)
        {
            decimal sum = 0;
            List<int> idList = new List<int>();

            if (ProductListBox.SelectedItems.Count == 0)
            {
                MessageBox.Show("Выберите продукты для изменения цены.");
                return;
            }

            foreach (Product item in ProductListBox.SelectedItems)
            {
                sum += item.MinCostForAgent;
                idList.Add(item.ID);
            }
            var newWindow = new EnterMinCostForAgentWindow(sum / ProductListBox.SelectedItems.Count);

            if ((bool)newWindow.ShowDialog())
            {
                try
                {
                    Globals.dataProvider.setMinCostForAgent(newWindow.Result, idList.ToArray());
                    MessageBox.Show("Стоимость успешно изменена.");
                }
                catch (Exception ex)
                {
                    MessageBox.Show($"Ошибка: {ex.Message}");
                }
            }
        }
        private void ProductListBox_OnSelectionChanged(
    object? sender,
    SelectionChangedEventArgs e)
        {
            if (ProductListBox != null)
            {
                productsSelectedCount = ProductListBox.SelectedItems.Count;
            }
            Invalidate();
        }
        private int productCount;
        public List<String> pageList { get; set; } = new List<String>();
        public IEnumerable<Product> productList
        {
            get
            {

                Globals.dataProvider.clearFilter();
                if (productTypeFilterId > 0)
                    Globals.dataProvider.addFilter(
                        "ProductTypeID = @ProductTypeID",
                        new { ProductTypeID = productTypeFilterId }
                    );
                switch (sortType)
                {
                    case 0:
                        Globals.dataProvider.setOrder("");
                        break;
                    case 1:
                        Globals.dataProvider.setOrder("Title");
                        break;
                    case 2:
                        Globals.dataProvider.setOrder("Title DESC");
                        break;
                    case 3:
                        Globals.dataProvider.setOrder("ArticleNumber");
                        break;
                    case 4:
                        Globals.dataProvider.setOrder("ArticleNumber DESC");
                        break;
                    case 5:
                        Globals.dataProvider.setOrder("MaterialCost");
                        break;
                    case 6:
                        Globals.dataProvider.setOrder("MaterialCost DESC");
                        break;
                }
                if (searchFilter.Length > 0)
                {
                    Globals.dataProvider.addFilter(
                        "(Title LIKE @search OR Description LIKE @search)",
                        new { search = $"%{searchFilter}%" }
                    );
                }
                var result = Globals.dataProvider.getProduct(currentPage);


                productCount = Globals.dataProvider.getProductCount();


                pageList.Clear();
                pageList.Add("<");
                for (int i = 1; i < (productCount / Globals.PAGE_LEN) + 1; i++)
                {
                    pageList.Add(i.ToString());
                }
                pageList.Add(">");


                PageListListBox.ItemsSource = pageList;

                return result;
            }
            set
            {
                _productList = value;
                Invalidate();
            }
        }
        public List<ProductType> productTypeList { get; set; }
        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
            Globals.dataProvider = new DBDataProvider();
            productList = Globals.dataProvider.getProduct(currentPage);
            productTypeList = Globals.dataProvider.getProductTypes().ToList();
            productTypeList.Insert(0, new ProductType { Title = "Все типы продукции" });
        }
        public string[] sortList { get; set; } = {
    "Без сортировки",
    "название по убыванию",
    "название по возрастанию",
    "артикул по убыванию",
    "артикул по возрастанию",
    "цена по убыванию",
    "цена по возрастанию" };
        private IEnumerable<Product> _productList;
        private const int PAGE_LEN = 20;

        private int _currentPage = 1;
        private string searchFilter = "";
        private int currentPage
        {
            get
            {
                return _currentPage;
            }
            set
            {
                _currentPage = value;
                Invalidate();
            }
        }
        private void InputElement_OnPointerPressed(
    object? sender, MouseButtonEventArgs e)
        {
            switch ((sender as TextBlock).Text)
            {
                case "<":

                    if (currentPage > 1) currentPage--;
                    return;
                case ">":

                    if (currentPage < productCount / Globals.PAGE_LEN) currentPage++;
                    return;
                default:

                    currentPage = Convert.ToInt32(
                        (sender as TextBlock).Text
                    );
                    return;
            }
        }
        private int productTypeFilterId = 0;

        private void ProductTypeFilter_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            productTypeFilterId = (ProductTypeFilter.SelectedItem as ProductType).ID;
            Invalidate();
        }
        private void ProductListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (ProductListBox != null)
            {
                productsSelectedCount = ProductListBox.SelectedItems.Count;
                CostChangeButton.Visibility = productsSelectedCount > 0 ? Visibility.Visible : Visibility.Collapsed;
            }
        }
        private void SearchFilter_KeyUp(object sender, KeyEventArgs e)
        {
            searchFilter = searchFilterTextBox.Text;
            Invalidate();
        }
        private int sortType = 0;
        private bool sortAsc = true;
        private void TextBlock_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            switch ((sender as TextBlock).Text)
            {
                case "<":

                    if (currentPage > 1) currentPage--;
                    return;
                case ">":

                    if (currentPage < productCount / Globals.PAGE_LEN) currentPage++;
                    return;
                default:

                    currentPage = Convert.ToInt32(
                        (sender as TextBlock).Text
                    );
                    return;
            }
        }
        private void SortTypeComboBox_SelectionChanged(
    object? sender,
    SelectionChangedEventArgs e)
        {
            if (SortTypeComboBox != null)
            {
                sortType = SortTypeComboBox.SelectedIndex;
                Invalidate();
            }
        }
        private void SearchFilterTextBox_OnKeyUp(object? sender, KeyEventArgs e)
        {
            if (searchFilterTextBox.Text != null && searchFilterTextBox.Text != "")
            {
                searchFilter = searchFilterTextBox.Text;
                Invalidate();
            }
        }
        private void ExitButton_Click(object sender, RoutedEventArgs e)
        {
            Application.Current.Shutdown();
        }
        public string costChangeButtonVisible
        {
            get
            {
                return productsSelectedCount > 1 ? "Visible" : "Hidden";
            }
        }
    }
}
```
```MainWindow.xaml```
```
<Window x:Class="sql_pagining.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:sql_pagining"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <Style x:Key="VerticalListBoxStyle" TargetType="ListBox">
            <Setter Property="ItemsPanel">
                <Setter.Value>
                    <ItemsPanelTemplate>
                        <StackPanel Orientation="Vertical"/>
                    </ItemsPanelTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="ItemTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <Border 
                            BorderThickness="2" 
                            BorderBrush="Black" 
                            CornerRadius="4" 
                            Margin="4"
                            Background="{Binding BackgroundColor}">
                            <Grid>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="*"/>
                                </Grid.RowDefinitions>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="64"/>
                                    <ColumnDefinition Width="*"/>
                                    <ColumnDefinition Width="auto"/>
                                </Grid.ColumnDefinitions>

                                <StackPanel Orientation="Horizontal" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2">
                                    <Image Width="88" Height="88" Source="{Binding ImageBitmap}" />

                                    <StackPanel Orientation="Vertical" Margin="10,0,0,0">
                                        <StackPanel Orientation="Horizontal">
                                            <TextBlock Margin="0" Text="{Binding ProductTypeTitle}" FontSize="14"/>
                                            <TextBlock Margin="5,0" Text=" | " />
                                            <TextBlock Margin="0" Text="{Binding Title}" FontSize="14"/>

                                        </StackPanel>
                                        <TextBlock Margin="0" Text="{Binding ArticleNumber}" HorizontalAlignment="Left" FontSize="12" />

                                        <TextBlock Margin="0" Text="{Binding MaterialString}" FontSize="11"/>

                                    </StackPanel>


                                </StackPanel>
                                <TextBlock Margin="0,2,10,0" Grid.Column="2" Text="{Binding MaterialCost}" FontSize="13" HorizontalAlignment="Right"/>
                            </Grid>
                        </Border>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="TileListBoxStyle" TargetType="ListBox">
            <Setter Property="ItemsPanel">
                <Setter.Value>
                    <ItemsPanelTemplate>
                        <WrapPanel HorizontalAlignment="Center" ItemWidth="200"/>
                    </ItemsPanelTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="ItemTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <Border BorderThickness="1" BorderBrush="Black" CornerRadius="5" Margin="5" Height="270">
                            <Grid>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="*"/>

                                </Grid.RowDefinitions>


                                <Image Margin="0,20,0,0" Width="120" Height="120" Source="{Binding ImageBitmap}" Grid.Row="0" HorizontalAlignment="Center" />


                                <StackPanel Grid.Row="1" Orientation="Vertical" HorizontalAlignment="Center">
                                    <TextBlock Text="{Binding ProductTypeTitle}" TextAlignment="Center"  TextWrapping="Wrap"/>
                                    <TextBlock Text="{Binding Title}" TextAlignment="Center"  TextWrapping="Wrap"/>
                                    <TextBlock Text="{Binding ArticleNumber}" TextAlignment="Center"  TextWrapping="Wrap"/>
                                    <TextBlock Text="{Binding MaterialCost}" TextAlignment="Center"  TextWrapping="Wrap"/>
                                    <TextBlock Text="{Binding MaterialString}" TextAlignment="Center"  TextWrapping="Wrap"/>
                                </StackPanel>
                            </Grid>
                        </Border>

                    </DataTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>

    <Grid ShowGridLines="True">
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"/>
            <RowDefinition />
            <RowDefinition Height="auto"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="200"/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Image 
        Source="/bin/Debug/net8.0-windows/Image/1.jpg" 
        Grid.RowSpan="2" HorizontalAlignment="Right"/>

        <ListBox
            Name="ProductListBox"
SelectionMode="Multiple"
SelectionChanged="ProductListBox_SelectionChanged"
    Style="{StaticResource VerticalListBoxStyle}"
    Grid.Row="1"
            Grid.Column="1"
    Background="White"
    ItemsSource="{Binding productList}"
            ScrollViewer.HorizontalScrollBarVisibility="Disabled" >
            <ListBox.ItemContainerStyle>
                <Style 
            TargetType="ListBoxItem">
                    <Setter 
                Property="HorizontalContentAlignment"
                Value="Stretch" />
                </Style>
            </ListBox.ItemContainerStyle>
        </ListBox>
        <StackPanel 
        Orientation="Vertical"
        Grid.RowSpan="3"
        VerticalAlignment="Bottom">
            <Button 
            x:Name="ExitButton"
            Content="Выход" 
            Click="ExitButton_Click"
            Height="50"/>


        </StackPanel>

        <WrapPanel
        Orientation="Horizontal"
        Grid.Column="1"
        MinHeight="50">
            <Button
    x:Name="CostChangeButton"
    Visibility="{Binding costChangeButtonVisible}"
    Click="CostChangeButton_Click"
    Content="Изменить стоимость на..."/>
            <ListBox Margin="5"
x:Name="PageListListBox"
ItemsSource="{Binding pageList}"
Grid.Column="1"
Grid.Row="2">


                <ListBox.ItemsPanel>
                    <ItemsPanelTemplate>
                        <WrapPanel 
            HorizontalAlignment="Right"></WrapPanel>
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>

                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <TextBlock
            Margin="5"
            Text="{Binding}" 
            PreviewMouseDown="TextBlock_PreviewMouseDown"/>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
            <ComboBox
Name="SortTypeComboBox"
SelectedIndex="0"
VerticalContentAlignment="Center"
Width="210" Height="30" Margin="10,0,10,0"
SelectionChanged="SortTypeComboBox_SelectionChanged"
ItemsSource="{Binding sortList}"/>
            <ComboBox
Width="120" Height="30"
x:Name="ProductTypeFilter"
SelectedIndex="0"
SelectionChanged="ProductTypeFilter_SelectionChanged"
ItemsSource="{Binding productTypeList}"/>
            <Label 
Content="Поиск" 
VerticalAlignment="Center"/>
            <TextBox
    Width="200"
    VerticalAlignment="Center"
    x:Name="searchFilterTextBox" 
    KeyUp="SearchFilterTextBox_OnKeyUp"/>
        </WrapPanel>

    </Grid>
</Window>
```
```DBDataProvider```
```
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using sql_pagining.models;
using Dapper;
using MySqlConnector;


namespace sql_pagining.models
{
    internal class DBDataProvider : IDataProvider
    {
        private string searchFilter = "";
        private Dictionary<string, object> filters = new Dictionary<string, object>();
        private string orderCondition = "";
        static string connectionString = "Server=kolei.ru; User ID=sbahtina; Password=010906; Database=sbahtina";
        public IEnumerable<Product> getProduct(int pageNum)
        {
            using (MySqlConnection db = new MySqlConnection(connectionString))
            {
                var builder = new SqlBuilder();

                if (orderCondition.Length > 0)
                    builder.OrderBy(orderCondition);

                if (filters.Count > 0)
                {
                    foreach (var item in filters)
                        builder.Where(item.Key, item.Value);
                }


                var template = builder.AddTemplate(
                    "SELECT * FROM ProductView /**where**/ /**orderby**/ LIMIT @pageLen OFFSET @offset",
                    new { pageLen = Globals.PAGE_LEN, offset = (pageNum - 1) * Globals.PAGE_LEN }
                );

                return db.Query<Product>(
                    template.RawSql,
                    template.Parameters).ToList();
            }

        }
        public int getProductCount()
        {
            using (MySqlConnection db = new MySqlConnection(connectionString))
            {
                var builder = new SqlBuilder();
                if (filters.Count > 0)
                {
                    foreach (var item in filters)
                    {
                        builder.Where(item.Key, item.Value);
                    }
                }
                var template = builder.AddTemplate(
                    "SELECT count(*) FROM ProductView /**where**/");
                return db.QuerySingle<int>(
                    template.RawSql,
                    template.Parameters);
            }
        }
        public void setOrder(string condition)
        {
            orderCondition = condition;
        }
        public void addFilter(string name, object value)
        {
            filters.Add(name, value);
        }

        public void clearFilter()
        {
            filters.Clear();
        }

        public IEnumerable<ProductType> getProductTypes()
        {
            using (MySqlConnection db = new MySqlConnection(connectionString))
            {
                return db.Query<ProductType>("SELECT * FROM ProductType");
            }
        }
        public void setMinCostForAgent(decimal minCostForAgent, int[] ids)
        {
            using (MySqlConnection db = new MySqlConnection(connectionString))
            {
                db.Execute("UPDATE Product SET MinCostForAgent=@newCost WHERE ID in @idList",
                new
                {
                    newCost = minCostForAgent,
                    idList = ids
                });
            }
        }
    }
}
```
```DataProvider```
```
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using sql_pagining.models;
using Dapper;
using MySqlConnector;


namespace sql_pagining.models
{
    public interface IDataProvider
    {
        IEnumerable<Product> getProduct(int pageNum);
        int getProductCount();
        void setOrder(string condition);
        IEnumerable<ProductType> getProductTypes();
        void clearFilter();
        void addFilter(string v, object value);
        void setMinCostForAgent(decimal result, int[] ints);
    }
}
```
```Product```
```
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using sql_pagining.models;
using Dapper;
using MySqlConnector;


namespace sql_pagining.models
{
    public class Product
    {
        public decimal MinCostForAgent { get; set; }
        public int ID { get; set; }
        public required string Title { get; set; }
        public string? Image { get; set; }
        public int ProductTypeID { get; set; }
        public required string ProductTypeTitle { get; set; }
        public required string ArticleNumber { get; set; }
        public double? MaterialCost { get; set; }
        public string? MaterialString { get; set; }
        public int? LastMonthSaleQuantity { get; set; }
        public string BackgroundColor
        {
            get
            {
                if (LastMonthSaleQuantity == null || LastMonthSaleQuantity == 0) return "#ff97bb"; // белый
                return "#ffafcc"; // розовый
            }
        }
        public Uri? ImageBitmap
        {
            get
            {
                var imageName = Environment.CurrentDirectory + (Image ?? "");
                return System.IO.File.Exists(imageName) ? new Uri(imageName) : null;
            }
        }
    }
}
```
```EnterMinCostForAgentWindow.haml```
```
<Window x:Class="sql_pagining.Windows.EnterMinCostForAgentWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:sql_pagining.Windows"
        mc:Ignorable="d"
        Title="EnterMinCostForAgentWindow" Height="450" Width="800">
    <Grid>
        <StackPanel
    Orientation="Vertical" Margin="0,50,0,0">
            <TextBox
        Name="CostTextBox"/>
            <Button 
        Content="Изменить" Click="Button_Click"/>
        </StackPanel>
    </Grid>
</Window>
```
```EnterMinCostForAgentWindow.haml.cs```
```
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace sql_pagining.Windows
{
    /// <summary>
    /// Логика взаимодействия для EnterMinCostForAgentWindow.xaml
    /// </summary>
    public partial class EnterMinCostForAgentWindow : Window
    {
        public decimal Result;
        public EnterMinCostForAgentWindow(decimal AvgCost)
        {
            InitializeComponent();
            CostTextBox.Text = AvgCost.ToString();
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                // пробуем сконвертировать в число
                Result = Convert.ToDecimal(CostTextBox.Text);
                // при присвоении результата свойству DialogResult модальное окно закрывается
                DialogResult = true;
            }
            catch (Exception)
            {
                MessageBox.Show("Стоимость должна быть числом");
            }
        }
    }
}
```