WPF Prism.Wpf implements mvvm,Prism.DryIOC implements IOC,IEventAggregator pub and sub message

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

 

using System.Configuration;
using System.Data;
using System.Windows;

namespace WpfApp42
{
    /// <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.RegisterSingleton<IIDService, IDService>();
            containerRegistry.RegisterSingleton<IISBNService, ISBNService>();
            containerRegistry.RegisterSingleton<INameService, NameService>();
            containerRegistry.RegisterSingleton<MainWindow>();
            containerRegistry.RegisterSingleton<MainWindowViewModel>();
        }
    }

    public interface IIDService
    {
        int GetId();
    }

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

    public interface IISBNService
    {
        string GetISBN();
    }

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

    public interface INameService
    {
        string GetName();
    }

    public class NameService : INameService
    {
        int idx = 0;
        public string GetName()
        {
            return $"Name_{Interlocked.Increment(ref idx)}";
        }
    }

}



 public MainWindowViewModel(IIDService idServiceValue, INameService nameServiceValue,
     IISBNService isbnServiceValue,IEventAggregator eventAggregatorValue)
 {
     idService = idServiceValue;
     nameService = nameServiceValue;
     isbnService = isbnServiceValue;
     eventAggregator = eventAggregatorValue;
     eventAggregator.GetEvent<MsgPayLoad>().Subscribe(OnMsgPayloadReceived);
 }

        private void OnMsgPayloadReceived(MsgLoad msgLoad)
        {
            MainTitle = msgLoad.ToString();
        }

MsgLoad msg = new MsgLoad()
{
    Idx = ++batchIdx,
    Msg = $"Loaded {BooksCollection.Count} books!",
    DTNow = DateTime.Now
};
eventAggregator.GetEvent<MsgPayLoad>().Publish(msg);

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<prism:PrismApplication x:Class="WpfApp42.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp42"
             xmlns:prism="http://prismlibrary.com/">
</prism:PrismApplication>

using System.Configuration;
using System.Data;
using System.Windows;

namespace WpfApp42
{
    /// <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.RegisterSingleton<IIDService, IDService>();
            containerRegistry.RegisterSingleton<IISBNService, ISBNService>();
            containerRegistry.RegisterSingleton<INameService, NameService>();
            containerRegistry.RegisterSingleton<MainWindow>();
            containerRegistry.RegisterSingleton<MainWindowViewModel>();
        }
    }

    public interface IIDService
    {
        int GetId();
    }

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

    public interface IISBNService
    {
        string GetISBN();
    }

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

    public interface INameService
    {
        string GetName();
    }

    public class NameService : INameService
    {
        int idx = 0;
        public string GetName()
        {
            return $"Name_{Interlocked.Increment(ref idx)}";
        }
    }

}


<Window x:Class="WpfApp42.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:WpfApp42"
        mc:Ignorable="d"
        xmlns:prism="http://prismlibrary.com/"
        WindowState="Maximized"
        prism:ViewModelLocator.AutoWireViewModel="True"
        Title="{Binding MainTitle,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
        Height="450" Width="800">
    <Grid>
        <DataGrid ItemsSource="{Binding BooksCollection,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                    VirtualizingPanel.IsVirtualizing="True"
                    VirtualizingPanel.CacheLength="2,2"
                    VirtualizingPanel.CacheLengthUnit="Item"
                    CanUserAddRows="False"
                    AutoGenerateColumns="False"
                    ScrollViewer.CanContentScroll="True"
                    ScrollViewer.IsDeferredScrollingEnabled="True">
            <DataGrid.Columns>
                <DataGridTemplateColumn>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Grid Width="{Binding DataContext.GridWidth,RelativeSource={RelativeSource AncestorType=Window}}"
                                  Height="{Binding DataContext.GridHeight,RelativeSource={RelativeSource AncestorType=Window}}"
                                  >
                                <Grid.Background>
                                    <ImageBrush ImageSource="{Binding ImgSource}"/>
                                </Grid.Background>
                                <Grid.Resources>
                                    <Style TargetType="TextBlock">
                                        <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>
                                </Grid.Resources>
                                <Grid.RowDefinitions>
                                    <RowDefinition/>
                                    <RowDefinition/>
                                    <RowDefinition/>
                                </Grid.RowDefinitions>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition/>
                                    <ColumnDefinition/>
                                    <ColumnDefinition/>
                                </Grid.ColumnDefinitions>
                                <TextBlock Grid.Row="0" Grid.Column="0" Text="{Binding Id}"/>
                                <TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding Name}"/>
                                <TextBlock Grid.Row="0" Grid.Column="2" Text="{Binding ISBN}"/>
                                <TextBlock Grid.Row="1" Grid.Column="0" Text="{Binding Author}"/>
                                <TextBlock Grid.Row="1" Grid.Column="1" Text="{Binding Comment}"/>
                                <TextBlock Grid.Row="1" Grid.Column="2" Text="{Binding Content}"/>
                                <TextBlock Grid.Row="2" Grid.Column="0" Text="{Binding Summary}"/>
                                <TextBlock Grid.Row="2" Grid.Column="1" Text="{Binding Title}"/>
                                <TextBlock Grid.Row="2" Grid.Column="2" Text="{Binding Topic}"/>
                            </Grid>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>


using System.Collections.ObjectModel;
using System.IO;
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.Navigation;
using System.Windows.Shapes;

namespace WpfApp42
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.Loaded += async (s, e) =>
            {
                if(this.DataContext is MainWindowViewModel vm)
                {
                    vm.GridWidth=this.ActualWidth;
                    vm.GridHeight = this.ActualHeight / 2;
                    await vm.InitBooksCollection();
                }
            };
        }
    }

    public class MainWindowViewModel : BindableBase
    {
        IIDService idService;
        INameService nameService;
        IISBNService isbnService;
        IEventAggregator eventAggregator;
        Dictionary<string, ImageSource> imgCacheDic = new Dictionary<string, ImageSource>();
        int batchIdx = 0;
        public MainWindowViewModel(IIDService idServiceValue, INameService nameServiceValue,
            IISBNService isbnServiceValue,IEventAggregator eventAggregatorValue)
        {
            idService = idServiceValue;
            nameService = nameServiceValue;
            isbnService = isbnServiceValue;
            eventAggregator = eventAggregatorValue;
            eventAggregator.GetEvent<MsgPayLoad>().Subscribe(OnMsgPayloadReceived);
        }

        private void OnMsgPayloadReceived(MsgLoad msgLoad)
        {
            MainTitle = msgLoad.ToString();
        }

        public async Task InitBooksCollection()
        {
            BooksCollection = new ObservableCollection<Book>();
            List<Book> booksList = new List<Book>();

            var imgs = Directory.GetFiles(@"../../../Images");
            if (imgs != null && !imgs.Any())
            {
                return;
            }

            int imgsCount = imgs.Count();
            for (int i = 1; i < 50000001; i++)
            {
                booksList.Add(new Book()
                {
                    Id = idService.GetId(),
                    Name = nameService.GetName(),
                    ISBN = isbnService.GetISBN(),
                    Author = $"ISBN_{i}",
                    Comment = $"Comment_{i}",
                    Content = $"Content_{i}",
                    Summary = $"Summary_{i}",
                    Title = $"Title_{i}",
                    Topic = $"Topic_{i}",
                    ImgSource = GetImgSource(imgs[i % imgsCount])
                });

                if (i % 100000 == 0)
                {
                    await PopulateBooksCollectionAsync(booksList);
                }
            }
            MainTitle = $"Loaded {BooksCollection.Count} books completed!";
        }

        private async Task PopulateBooksCollectionAsync(List<Book> booksList)
        {
            await Application.Current.Dispatcher.InvokeAsync(() =>
            {
                foreach (var bk in booksList)
                {
                    BooksCollection.Add(bk);
                }
                booksList.Clear();
                //MainTitle = $"Loaded {BooksCollection.Count} books!";
                MsgLoad msg = new MsgLoad()
                {
                    Idx = ++batchIdx,
                    Msg = $"Loaded {BooksCollection.Count} books!",
                    DTNow = DateTime.Now
                };
                eventAggregator.GetEvent<MsgPayLoad>().Publish(msg);
            }, System.Windows.Threading.DispatcherPriority.Background);
        }

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

            if (imgCacheDic.ContainsKey(imgUrl))
            {
                return imgCacheDic[imgUrl];
            }

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

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

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

    public class Book
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string ISBN { get; set; }
        public string Author { get; set; }
        public string Comment { get; set; }
        public string Content { get; set; }
        public string Summary { get; set; }
        public string Title { get; set; }
        public string Topic { get; set; }
        public ImageSource ImgSource { get; set; }
    }

    public class MsgLoad
    {
        public int Idx { get; set; }
        public DateTime DTNow { get; set; }
        public string Msg { get; set; }

        public override string ToString()
        {
            return $"Idx:{Idx},Now:{DateTime.Now.ToString("yyyyMMddHHmmssffff")},Msg:{Msg}";
        }
    }

    public class MsgPayLoad:PubSubEvent<MsgLoad>
    {
        
    }
}