demka/demofinish/HistoryWindow.axaml.cs

using System;
using System.Collections.ObjectModel;
using System.Linq;
using Avalonia.Controls;
using Avalonia.Interactivity;
using demofinish.Model;
using Microsoft.EntityFrameworkCore;

namespace demofinish;

public partial class HistoryWindow : Window
{
    private ObservableCollection<Productsale> products = new ObservableCollection<Productsale>();
    private ObservableCollection<Productsale> allProducts = new ObservableCollection<Productsale>();

    public HistoryWindow()
    {
        InitializeComponent();
        LoadInfo();
    }

    private void LoadInfo()
    {
        using var context = new User1Context();

        var productSales = context.Productsales
            .Include(ps => ps.Product)
            .Include(ps => ps.Agent)
            .ToList();

        allProducts.Clear();
        products.Clear();
        
        foreach (var item in productSales)
        {
            allProducts.Add(item);
            products.Add(item);
        }
    
        ProductListBox.ItemsSource = products;
        
        
        SearchBox.ItemsSource = allProducts
            .Select(p => p.Product.Title)
            .Distinct()
            .ToList();
    }

    private void SearchBox_OnTextChanged(object sender, TextChangedEventArgs e)
    {
        var searchText = SearchBox.Text?.ToLower() ?? string.Empty;
        
        if (string.IsNullOrWhiteSpace(searchText))
        {
            
            products.Clear();
            foreach (var item in allProducts)
            {
                products.Add(item);
            }
        }
        else
        {
            
            var filtered = allProducts
                .Where(p => p.Product.Title.ToLower().Contains(searchText))
                .ToList();
            
            products.Clear();
            foreach (var item in filtered)
            {
                products.Add(item);
            }
        }
    }
    
    private void SearchBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (SearchBox.SelectedItem is string selectedProduct)
        {
            var filtered = allProducts
                .Where(p => p.Product.Title.Equals(selectedProduct, StringComparison.OrdinalIgnoreCase))
                .ToList();
        
            products.Clear();
            foreach (var item in filtered)
            {
                products.Add(item);
            }
        }
    }

    private void AddNewPosition(object? sender, RoutedEventArgs e)
    {
        new AddNewPosition().ShowDialog(this);
    }

    private void BackClick(object? sender, RoutedEventArgs e)
    {
        this.Close();
    }
}