WPF mvvm via Prism.Wpf,dependency injection via Prism.DryIOC

Install-Package Prism.Wpf
Install-Package Prism.DryIOC

 

//App.xaml
<prism:PrismApplication x:Class="WpfApp46.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp46"
             xmlns:prism="http://prismlibrary.com/">     
</prism:PrismApplication>

//App.xaml.cs
using System.Configuration;
using System.Data;
using System.Security.Cryptography.Xml;
using System.Windows;
using Prism.Ioc;

namespace WpfApp46
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : PrismApplication
    {
        protected override Window CreateShell()
        {
            return Container.Resolve<MainWindow>();
        }

        protected override void RegisterTypes(IContainerRegistry containerRegistry)
        {
            containerRegistry.Register<IIDService, IDService>();
            containerRegistry.Register<IISBNService, ISBNService>();
            containerRegistry.Register<MainWindow>();
            containerRegistry.Register<MainWindowViewModel>();
        }
    }

    public interface IIDService
    {
        int GetID();
    }

    public class IDService : IIDService
    {
        int cnt = 0;
        public int GetID()
        {
            return Interlocked.Increment(ref cnt);
        }
    }

    public interface IISBNService
    {
        string GetISBN();
    }

    public class ISBNService : IISBNService
    {
        int idx = 0;
        public string GetISBN()
        {
            return $"ISBN_{Interlocked.Increment(ref idx)}_{Guid.NewGuid():N}";
        }
    }

}


//MainWindow.xaml
<Window x:Class="WpfApp46.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:WpfApp46"
        mc:Ignorable="d"
        xmlns:prism="http://prismlibrary.com/"
        prism:ViewModelLocator.AutoWireViewModel="True"
        WindowState="Maximized"
        Title="{Binding MainTitle,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">
    <Grid>
        <DataGrid ItemsSource="{Binding BooksCollection,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                  VirtualizingPanel.IsVirtualizing="True"
                  VirtualizingPanel.CacheLengthUnit="Item"
                  VirtualizingPanel.CacheLength="2,2"
                  AutoGenerateColumns="False"
                  CanUserAddRows="False"
                  ScrollViewer.CanContentScroll="True"
                  ScrollViewer.IsDeferredScrollingEnabled="True">
            <DataGrid.Columns>
                <DataGridTemplateColumn>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Grid Width="{Binding DataContext.GridWidth,RelativeSource={RelativeSource 
                                Mode=FindAncestor,AncestorType={x:Type Window}}}"
                                  Height="{Binding DataContext.GridHeight,RelativeSource={RelativeSource 
                                Mode=FindAncestor,AncestorType={x:Type Window}}}">
                                <Grid.Background>
                                    <ImageBrush ImageSource="{Binding ImgSource}"/>
                                </Grid.Background>
                                <Grid.Resources>
                                    <Style TargetType="TextBlock">
                                        <Setter Property="FontSize" Value="60"/>
                                        <Style.Triggers>
                                            <Trigger Property="IsMouseOver" Value="True">
                                                <Setter Property="FontSize" Value="100"/>
                                                <Setter Property="Foreground" Value="Red"/>
                                            </Trigger>
                                        </Style.Triggers>
                                    </Style>
                                </Grid.Resources>
                                <Grid.RowDefinitions>
                                    <RowDefinition/>
                                    <RowDefinition/>
                                </Grid.RowDefinitions>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition/>
                                    <ColumnDefinition/>
                                </Grid.ColumnDefinitions>
                                <TextBlock Text="{Binding Id}" Grid.Row="0" Grid.Column="0"/>
                                <TextBlock Text="{Binding Name}" Grid.Row="0" Grid.Column="1"/>
                                <TextBlock Text="{Binding ISBN}" Grid.Row="1" Grid.ColumnSpan="2"/>
                            </Grid>                                  
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>


//MainWindow.cs
using Prism.Common;
using System.Collections.Concurrent;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.IO;
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 System.Xml.Linq;

namespace WpfApp46
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.Loaded += async (s, e) =>
            {
                var vm = this.DataContext as MainWindowViewModel;
                if (vm != null)
                {
                    vm.GridWidth = this.ActualWidth;
                    vm.GridHeight = this.ActualHeight;
                    await vm.InitBooksCollectionAsync();
                }
            };
        }
    }

    public class MainWindowViewModel : BindableBase
    {
        IIDService idService;
        IISBNService isbnService;
        private ConcurrentDictionary<string, ImageSource> imgDicCache = new ConcurrentDictionary<string, ImageSource>();
        public MainWindowViewModel(IIDService idServiceValue, IISBNService isbnServiceValue)
        {
            idService = idServiceValue;
            isbnService = isbnServiceValue;
        }

        public async Task InitBooksCollectionAsync()
        {
            BooksCollection = new ObservableCollection<Book>();
            List<Book> booksList = new List<Book>();
            var imgsList = Directory.GetFiles("../../../Images");
            int imgsCount = imgsList.Count();
            for (int i = 1; i < 10000001; i++)
            {
                booksList.Add(new Book()
                {
                    Id = i,
                    Name = $"Name_{i}",
                    ISBN = $"ISBN_{i}_{Guid.NewGuid():N}",
                    ImgSource = GetImgSource(imgsList[i % imgsCount])
                });

                if (i % 1000000 == 0)
                {
                    var tempList = booksList.ToList();
                    booksList.Clear();
                    await Application.Current.Dispatcher.InvokeAsync(() =>
                    {
                        foreach(var bk in tempList)
                        {
                            BooksCollection.Add(bk);
                        }
                    },System.Windows.Threading.DispatcherPriority.Background);
                    MainTitle=$"{DateTime.Now.ToString("yyyyMMddHHmmssffff")}," +
                        $"loaded {BooksCollection.Count()} items," +
                        $"Memory,{GetMemory()}";
                }
            }
        }

        private string GetMemory()
        {
            var proc=Process.GetCurrentProcess();
            return $"{proc.PrivateMemorySize64 / 1024 / 1024} M";
        }

        private ImageSource GetImgSource(string imgUrl)
        {
            if (!File.Exists(imgUrl))
            {
                return null;
            }

            if (imgDicCache.TryGetValue(imgUrl, out ImageSource imgSource))
            {
                return imgSource;
            }
            BitmapImage bmi = new BitmapImage();
            bmi.BeginInit();
            bmi.UriSource = new Uri(imgUrl, UriKind.RelativeOrAbsolute);
            bmi.EndInit();
            if (bmi.CanFreeze)
            {
                bmi.Freeze();
            }
            imgDicCache[imgUrl] = bmi;
            return bmi;
        }

        private string mainTitle;
        public string MainTitle
        {
            get
            {
                return mainTitle;
            }
            set
            {
                SetProperty(ref mainTitle, value);
            }
        }

        private ObservableCollection<Book> booksCollection;
        public ObservableCollection<Book> BooksCollection
        {
            get
            {
                return booksCollection;
            }
            set
            {
                SetProperty(ref booksCollection, value);
            }
        }

        private double gridWidth;
        public double GridWidth
        {
            get
            {
                return gridWidth;
            }
            set
            {
                SetProperty(ref gridWidth, value);
            }
        }

        private double gridHeight;
        public double GridHeight
        {
            get
            {
                return gridHeight;
            }
            set
            {
                SetProperty(ref gridHeight, value);
            }
        }
    }

    public class Book
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string ISBN { get; set; }
        public ImageSource ImgSource { get; set; }
    }
}