WPF Prism PrismApplication OnInitialized()

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

 

 

//app.xaml
<prism:PrismApplication x:Class="WpfApp38.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp38"
             xmlns:prism="http://prismlibrary.com/" >
    <Application.Resources>
    </Application.Resources>
</prism:PrismApplication>


//app.xaml.cs
using Prism.DryIoc;
using Prism.Ioc;
using System.Windows;
using WpfApp38.ViewModels;
using WpfApp38.Views;

namespace WpfApp38
{
    /// <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.RegisterForNavigation<ViewA, ViewAViewModel>("ViewA");
            containerRegistry.RegisterForNavigation<ViewB, ViewBViewModel>("ViewB");
            containerRegistry.RegisterForNavigation<MainWindow, MainWindowViewModel>("MainWindow");
        }

        protected override void ConfigureRegionAdapterMappings(RegionAdapterMappings regionAdapterMappings)
        {
            base.ConfigureRegionAdapterMappings(regionAdapterMappings);
        }

        protected override void OnInitialized()
        {
            base.OnInitialized();
            var regionManager=Container.Resolve<IRegionManager>();
            regionManager.RequestNavigate("MainRegion", "ViewA");
        }

        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);
        }
    }

}


//MainWindow.xaml
<Window x:Class="WpfApp38.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:WpfApp38"
        mc:Ignorable="d"
        WindowState="Maximized"
        Title="{Binding MainVMTitle,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
        xmlns:prism="http://prismlibrary.com/"
        prism:ViewModelLocator.AutoWireViewModel="True">
    <Window.Resources>
        <Style TargetType="Button">
            <Setter Property="FontSize" Value="50"/>
        </Style>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Button Content="View A"
                Grid.Row="0"
                Grid.Column="0"
                Command="{Binding NavigateCommand}"
                CommandParameter="ViewA"/>
        <Button Content="View B"
                Grid.Row="0"
                Grid.Column="1"
                Command="{Binding NavigateCommand}"
                CommandParameter="ViewB"/>
        
        <ContentControl Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2"
                        Background="Cyan"
                        prism:RegionManager.RegionName="MainRegion"
                        VerticalAlignment="Stretch"/>
    </Grid>
</Window>


//MainWindow.xaml.cs
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 WpfApp38
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }
}

//MainWindowViewModel.cs
using System;
using System.Collections.Generic;
using System.Text;

namespace WpfApp38.ViewModels
{
    public class MainWindowViewModel : BindableBase
    {
        private readonly IRegionManager regionManager;

        public MainWindowViewModel(IRegionManager regionManagerValue)
        {
            regionManager = regionManagerValue;
            MainVMTitle=$"In Main Window,{DateTime.Now.ToString("yyyy-MM-dd:HH-mm-ss")}";
            System.Timers.Timer tmr = new System.Timers.Timer();
            tmr.Elapsed+=Tmr_Elapsed;
            tmr.Interval=1000;
            tmr.Start();
            NavigateCommand=new DelegateCommand<string>(NavigateCommandExecuted);
        }

        private void NavigateCommandExecuted(string viewName)
        {
            if (!string.IsNullOrEmpty(viewName))
            {
                regionManager.RequestNavigate("MainRegion", viewName);
            }
        }

        private void Tmr_Elapsed(object? sender, System.Timers.ElapsedEventArgs e)
        {
            MainVMTitle=$"In Main Window,{DateTime.Now.ToString("yyyy-MM-dd:HH-mm-ss")}";
        }

        private string mainVMTitle;
        public string MainVMTitle
        {
            get
            {
                return mainVMTitle;
            }
            set
            {
                SetProperty(ref mainVMTitle, value);
            }
        }

        public DelegateCommand<string> NavigateCommand { get; set; }
    }
}


//ViewA.xaml
<UserControl x:Class="WpfApp38.Views.ViewA"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:WpfApp38.Views"
             mc:Ignorable="d" 
             VerticalAlignment="Stretch"
             HorizontalAlignment="Stretch"
             xmlns:prism="http://prismlibrary.com/"
             prism:ViewModelLocator.AutoWireViewModel="True"
             >
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>

        <ListBox Grid.Row="0"
                 ItemsSource="{Binding SlimBooksCollection,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                 VirtualizingPanel.IsVirtualizing="True"
                 VirtualizingPanel.IsContainerVirtualizable="True"
                 VirtualizingPanel.VirtualizationMode="Recycling"
                 ScrollViewer.IsDeferredScrollingEnabled="True">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Grid Width="{Binding DataContext.LbxWidth,RelativeSource={RelativeSource AncestorType=UserControl}}"
                          Height="{Binding DataContext.LbxHeight,RelativeSource={RelativeSource AncestorType=UserControl}}">
                        <Grid.Resources>
                            <Style TargetType="TextBlock">
                                <Setter Property="FontSize" Value="50"/>
                                <Style.Triggers>
                                    <Trigger Property="IsMouseOver" Value="True">
                                        <Setter Property="FontSize" Value="100"/>
                                        <Setter Property="Foreground" Value="Red"/>
                                    </Trigger>
                                </Style.Triggers>
                            </Style>
                        </Grid.Resources>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition/>
                            <ColumnDefinition/>
                            <ColumnDefinition/>
                            <ColumnDefinition/>
                        </Grid.ColumnDefinitions>
                        <TextBlock Text="{Binding Id}" Grid.Column="0" Width="Auto"/>
                        <TextBlock Text="{Binding Name}" Grid.Column="1"  Width="Auto"/>
                        <TextBlock Text="{Binding Title}" Grid.Column="2"  Width="Auto"/>
                        <TextBlock Text="{Binding ISBN}" Grid.Column="3"  Width="Auto"
                                    TextWrapping="Wrap"/>
                    </Grid>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        
        <Button Grid.Row="1"
                Content="View A ReLoad Data"
                Command="{Binding LoadViewADataCommand}"/>
    </Grid>
</UserControl>


//ViewA.xaml.cs
using System;
using System.Collections.Generic;
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 WpfApp38.Views
{
    /// <summary>
    /// Interaction logic for ViewA.xaml
    /// </summary>
    public partial class ViewA : UserControl
    {
        public ViewA()
        {
            InitializeComponent();
        }
    }
}


//ViewB.xaml
<UserControl x:Class="WpfApp38.Views.ViewB"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:WpfApp38.Views"
             xmlns:prism="http://prismlibrary.com/"
             mc:Ignorable="d" 
             VerticalAlignment="Stretch"
             HorizontalAlignment="Stretch"
             prism:ViewModelLocator.AutoWireViewModel="True">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <TextBlock Grid.Row="0"
                   Text="{Binding ViewBTitle,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">
            <TextBlock.Style>
                <Style TargetType="TextBlock">
                    <Setter Property="FontSize" Value="50"/>
                    <Style.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Foreground" Value="Red"/>
                            <Setter Property="FontSize" Value="100"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </TextBlock.Style>
        </TextBlock>

        <DataGrid Grid.Row="1"
                  ItemsSource="{Binding BooksCollection,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                  VirtualizingPanel.IsVirtualizing="True"
                  VirtualizingPanel.VirtualizationMode="Recycling"
                  ScrollViewer.IsDeferredScrollingEnabled="True"
                  VirtualizingPanel.CacheLengthUnit="Pixel"
                  VirtualizingPanel.CacheLength="100">
            <DataGrid.Columns>
                <DataGridTemplateColumn>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Grid Width="{Binding DataContext.GridWidth,RelativeSource={RelativeSource AncestorType=UserControl}}"
                                  Height="{Binding DataContext.GridHeight,RelativeSource={RelativeSource AncestorType=UserControl}}">
                                <Grid.Background>
                                    <ImageBrush ImageSource="{Binding ImgSource}"/>
                                </Grid.Background>
                                <Grid.Resources>
                                    <Style TargetType="TextBlock">
                                        <Setter Property="FontSize" Value="50"/>
                                        <Style.Triggers>
                                            <Trigger Property="IsMouseOver" Value="True">
                                                <Setter Property="FontSize" Value="80"/>
                                                <Setter Property="Foreground" Value="Red"/>
                                            </Trigger>
                                        </Style.Triggers>
                                    </Style>
                                </Grid.Resources>
                                <Grid.RowDefinitions>
                                    <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 Title}"/>
                                <TextBlock Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="3"
                                           Text="{Binding ISBN}" HorizontalAlignment="Center"/>
                            </Grid>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>

        <Button Grid.Row="2"
                Content="ViewB ReLoad Data"
                FontSize="50"
                Command="{Binding LoadDataCommand}"/>
    </Grid>
</UserControl>


//ViewB.xaml.cs
using System;
using System.Collections.Generic;
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 WpfApp38.Views
{
    /// <summary>
    /// Interaction logic for ViewB.xaml
    /// </summary>
    public partial class ViewB : UserControl
    {
        public ViewB()
        {
            InitializeComponent();
        }
    }
}


//ViewModelBViewModel.cs
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Text;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using WpfApp38.Models;

namespace WpfApp38.ViewModels
{
    public class ViewBViewModel : BindableBase
    {
        System.Timers.Timer tmr;
        public ViewBViewModel()
        {
            InitSlimBooksCollection();
            LoadDataCommand=new DelegateCommand(LoadDataCommandExecuted);           
            InitVariables();
            tmr= new System.Timers.Timer();
            tmr.Elapsed+=Tmr_Elapsed;
            tmr.Interval=1000;
            tmr.Start();
        }

        private void Tmr_Elapsed(object? sender, System.Timers.ElapsedEventArgs e)
        {
            ViewBTitle=$"In ViewBTitle,UtcNow is {DateTime.UtcNow.ToString("yyyyMMddHHmmss")}";
        }

        private void InitVariables()
        {
            var mainWin = System.Windows.Application.Current.MainWindow;
            if (mainWin!=null)
            {
                GridWidth= mainWin.ActualWidth;
                GridHeight= mainWin.ActualHeight/2;
            }
        }

        private void LoadDataCommandExecuted()
        {
            bool flowControl = InitSlimBooksCollection();
            if (!flowControl)
            {
                return;
            }
        }

        private bool InitSlimBooksCollection()
        {
            var dir = @"../../../Images";
            if (!Directory.Exists(dir))
            {
                return false;
            }

            var imgs = Directory.GetFiles(dir);
            if (imgs==null ||!imgs.Any())
            {
                return false;
            }

            int imgsCount = imgs.Count();
            BooksCollection=new ObservableCollection<Book>();
            for (int i = 1; i<1001; i++)
            {
                BooksCollection.Add(new Book()
                {
                    Id=i,
                    Name=$"Name_{i}", 
                    ISBN=$"ISBN_{i}_{Guid.NewGuid()}",
                    Title=$"Title_{i}",
                    
                    ImgSource=GetImgSourceViaUrl(imgs[i%imgsCount])
                });
            }

            return true;
        }

        private ImageSource GetImgSourceViaUrl(string imgUrl)
        {
            BitmapImage bmi = new BitmapImage();
            if (!File.Exists(imgUrl))
            {
                return bmi;
            }

            bmi.BeginInit();
            bmi.UriSource=new Uri(imgUrl, UriKind.RelativeOrAbsolute);
            bmi.CacheOption= BitmapCacheOption.OnDemand;
            bmi.EndInit();
            bmi.Freeze();
            return bmi;
        }

        public DelegateCommand LoadDataCommand { get; set; }

        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);
            }
        }

        private string viewBTitle;
        public string ViewBTitle
        {
            get
            {
                return viewBTitle;
            }
            set
            {
                SetProperty(ref  viewBTitle, value);
            }
        }
    }
}