## Создание подключения к БД MySQL. Получение данных с сервера
#### MainWindow.xaml.cs
```
namespace mysql_connector2
{
    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="mysql_connector2.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:mysql_connector2"
        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/logo/Logo.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>
```
![](./img/111.png)
![](./img/112.png)
![](./img/113.png)
![](./img/114.png)
