Install-Package Microsoft.Extensions.DependencyInjection; Install-Package Microsoft.Hosting; Install-Package CommunityToolkit.mvvm;
using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using System.Configuration; using System.Data; using System.Windows;namespace WpfApp24 {/// <summary>/// Interaction logic for App.xaml/// </summary>public partial class App : Application{private IHost host;public App(){host=Host.CreateDefaultBuilder().ConfigureServices((context, services) =>{services.AddSingleton<IIDService,IDService>();services.AddSingleton<INameService, NameService>();services.AddSingleton<IISBNService,ISBNService>();services.AddSingleton<MainWindow>();services.AddSingleton<MainVM>();}).Build();}protected override async void OnStartup(StartupEventArgs e){await host!.StartAsync();var mainWin=host.Services.GetRequiredService<MainWindow>();mainWin.Show();base.OnStartup(e);}protected override async void OnExit(ExitEventArgs e){using(host){await host!.StopAsync(TimeSpan.FromSeconds(5));}base.OnExit(e);}}}public partial class MainWindow : Window {public MainWindow(MainVM vm){InitializeComponent();this.DataContext = vm;this.Loaded += async (s, e) =>{try{await vm.InitBooksCollectionAsync();}catch (Exception ex){MessageBox.Show(ex.Message);}};} }
//App.xaml <Application x:Class="WpfApp24.App"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="clr-namespace:WpfApp24"><Application.Resources></Application.Resources> </Application>//App.xaml.cs using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using System.Configuration; using System.Data; using System.Windows;namespace WpfApp24 {/// <summary>/// Interaction logic for App.xaml/// </summary>public partial class App : Application{private IHost host;public App(){host=Host.CreateDefaultBuilder().ConfigureServices((context, services) =>{services.AddSingleton<IIDService,IDService>();services.AddSingleton<INameService, NameService>();services.AddSingleton<IISBNService,ISBNService>();services.AddSingleton<MainWindow>();services.AddSingleton<MainVM>();}).Build();}protected override async void OnStartup(StartupEventArgs e){await host!.StartAsync();var mainWin=host.Services.GetRequiredService<MainWindow>();mainWin.Show();base.OnStartup(e);}protected override async void OnExit(ExitEventArgs e){using(host){await host!.StopAsync(TimeSpan.FromSeconds(5));}base.OnExit(e);}}}//MainWindow.xaml <Window x:Class="WpfApp24.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:WpfApp24"WindowState="Maximized"mc:Ignorable="d"Title="MainWindow" Height="450" Width="800"><Grid><Grid.RowDefinitions><RowDefinition/><RowDefinition Height="Auto"/></Grid.RowDefinitions><DataGrid Grid.Row="0"ItemsSource="{Binding BooksCollection,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"VirtualizingPanel.IsVirtualizing="True"VirtualizingPanel.VirtualizationMode="Recycling"VirtualizingPanel.CacheLength="2,2"VirtualizingPanel.CacheLengthUnit="Item"ScrollViewer.CanContentScroll="True"ScrollViewer.IsDeferredScrollingEnabled="True"AutoGenerateColumns="False"><DataGrid.Resources><Style TargetType="DataGridRow"><Setter Property="FontSize" Value="30"/><!--<Style.Triggers><Trigger Property="IsMouseOver" Value="True"><Setter Property="FontSize" Value="50"/><Setter Property="Foreground" Value="Red"/></Trigger></Style.Triggers>--></Style></DataGrid.Resources><DataGrid.Columns><DataGridTextColumn Binding="{Binding Id}"/><DataGridTextColumn Binding="{Binding Name}"/><DataGridTextColumn Binding="{Binding Title}"/><DataGridTextColumn Binding="{Binding Topic}"/><DataGridTextColumn Binding="{Binding ISBN}"/></DataGrid.Columns></DataGrid><TextBlock Text="{Binding StatusMsg}" Grid.Row="1" FontSize="30"/></Grid> </Window>//MainWindow.xaml.cs using CommunityToolkit.Mvvm.ComponentModel; using System.Collections.ObjectModel; 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;namespace WpfApp24 {/// <summary>/// Interaction logic for MainWindow.xaml/// </summary>public partial class MainWindow : Window{public MainWindow(MainVM vm){InitializeComponent();this.DataContext = vm;this.Loaded += async (s, e) =>{try{await vm.InitBooksCollectionAsync();}catch (Exception ex){MessageBox.Show(ex.Message);}};}}public class MainVM : ObservableObject{IIDService iDService;INameService nameService;IISBNService isbnService;public MainVM(IIDService iDServiceValue, INameService nameService, IISBNService isbnService){this.iDService = iDServiceValue;this.nameService = nameService;this.isbnService = isbnService;}public async Task InitBooksCollectionAsync(){BooksCollection = new ObservableCollection<Book>();List<Book> booksList = new List<Book>();await Task.Run(async () =>{for (int i = 1; i < 100000001; i++){booksList.Add(new Book(){Id = iDService.GetID(),Name = nameService.GetName(),ISBN = isbnService.GetISBN(),Title = $"Title_{i}",Topic = $"Topic_{i}"});if (i % 100000 == 0){await PopulateBooksCollectionAsync(booksList);}}if (booksList.Any()){await PopulateBooksCollectionAsync(booksList);}});}private async Task PopulateBooksCollectionAsync(List<Book> booksList){await Application.Current.Dispatcher.InvokeAsync(() =>{var tempList = booksList.ToList();booksList.Clear();foreach (var bk in tempList){BooksCollection.Add(bk);}StatusMsg = $"Loaded {BooksCollection.Count} items";}, System.Windows.Threading.DispatcherPriority.Background);}private ObservableCollection<Book> booksCollection;public ObservableCollection<Book> BooksCollection{get{return booksCollection;}set{SetProperty(ref booksCollection, value);}}private string statusMsg;public string StatusMsg{get{return statusMsg;}set{SetProperty(ref statusMsg, value);}}}public class Book{public int Id { get; set; }public string Name { get; set; }public string Title { get; set; }public string Topic { get; set; }public string ISBN { get; set; }}public interface IIDService{int GetID();}public class IDService : IIDService{int id = 0;public int GetID(){return Interlocked.Increment(ref id);}}public interface INameService{string GetName();}public class NameService : INameService{int idx = 0;public string GetName(){return $"Name_{Interlocked.Increment(ref idx)}";}}public interface IISBNService{string GetISBN();}public class ISBNService : IISBNService{int idx = 0;public string GetISBN(){return $"ISBN_{Interlocked.Increment(ref idx)}_{Guid.NewGuid():N}";}} }