WPF Prism register interface and service, view and viewmodel, IRegionManager, RequestNavigate

Install-Package Prism.DryIOC;
Install-Package Prism.Wpf;
Install-Package Microsoft.Xaml.Behaviors.WPF;

 

 

 

//App.xaml
<prism:PrismApplication x:Class="WpfApp14.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp14"
             xmlns:prism="http://prismlibrary.com/">
    <prism:PrismApplication.Resources>
        <Style TargetType="Button">
            <Setter Property="FontSize" Value="50"/>
        </Style>
        <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>
    </prism:PrismApplication.Resources>
</prism:PrismApplication>


//App.xaml.cs
using System.Configuration;
using System.Data;
using System.Windows;
using WpfApp14.Services;
using WpfApp14.ViewModels;
using WpfApp14.Views;

namespace WpfApp14
{
    /// <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<INameService, NameService>();
            containerRegistry.RegisterForNavigation<ViewA, ViewAViewModel>("ViewA");
            containerRegistry.RegisterForNavigation<ViewB, ViewBViewModel>("ViewB");
            containerRegistry.RegisterForNavigation<MainWindow, MainWindowViewModel>("MainWindow");
        }

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

 

 

 

 

 

 

 

 

//App.xaml
<prism:PrismApplication x:Class="WpfApp14.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp14"
             xmlns:prism="http://prismlibrary.com/">
    <prism:PrismApplication.Resources>
        <Style TargetType="Button">
            <Setter Property="FontSize" Value="50"/>
        </Style>
        <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>
    </prism:PrismApplication.Resources>
</prism:PrismApplication>



//App.xaml.cs
using System.Configuration;
using System.Data;
using System.Windows;
using WpfApp14.Services;
using WpfApp14.ViewModels;
using WpfApp14.Views;

namespace WpfApp14
{
    /// <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<INameService, NameService>();
            containerRegistry.RegisterForNavigation<ViewA, ViewAViewModel>("ViewA");
            containerRegistry.RegisterForNavigation<ViewB, ViewBViewModel>("ViewB");
            containerRegistry.RegisterForNavigation<MainWindow, MainWindowViewModel>("MainWindow");
        }

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



//MainWindow.xaml
<Window x:Class="WpfApp14.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:behavior="http://schemas.microsoft.com/xaml/behaviors"
        xmlns:local="clr-namespace:WpfApp14"
        WindowState="Maximized"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"
        xmlns:prism="http://prismlibrary.com/"
        prism:ViewModelLocator.AutoWireViewModel="True">
    <behavior:Interaction.Triggers>
        <behavior:EventTrigger EventName="MouseMove">
            <behavior:InvokeCommandAction
                Command="{Binding MouseMoveCommand}"/>
        </behavior:EventTrigger>
    </behavior:Interaction.Triggers>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </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"
                prism:RegionManager.RegionName="MainRegion"
                VerticalAlignment="Stretch"
                HorizontalAlignment="Stretch"/>

        <TextBlock Grid.Row="2"
                   Text="{Binding MainStatusMsg}"/>
    </Grid>
</Window>


//MainWindowViewModel.cs
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Windows;
using System.Windows.Input;

namespace WpfApp14.ViewModels
{
    public class MainWindowViewModel : BindableBase
    {
        IRegionManager regionManager;
        public MainWindowViewModel(IRegionManager regionManager)
        {
            this.regionManager = regionManager;
            NavigateCommand = new DelegateCommand<string>(NavigateCommandExecuted);
            MouseMoveCommand = new DelegateCommand(MouseMoveCommandExecuted);
        }

        private void MouseMoveCommandExecuted()
        {
            var pt=Mouse.GetPosition(Application.Current.MainWindow);
            MainStatusMsg = $"Location:X:{pt.X:F0},Y:{pt.Y:F0}";
        }

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

        private string mainStatusMsg;
        public string MainStatusMsg
        {
            get
            {
                return mainStatusMsg;
            }
            set
            {
                SetProperty(ref mainStatusMsg, value);
            }
        }

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


//ViewA.xaml
<UserControl x:Class="WpfApp14.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:WpfApp14.Views"
             mc:Ignorable="d"             
             VerticalAlignment="Stretch"
             HorizontalAlignment="Stretch"
             xmlns:prism="http://prismlibrary.com/"
             prism:ViewModelLocator.AutoWireViewModel="True">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>           
        </Grid.RowDefinitions>
        <TextBlock Grid.Row="0"
                   Text="{Binding ViewATitle,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                   FontSize="50"/>
        <DataGrid Grid.Row="1"
                  ItemsSource="{Binding BooksCollection}"
                  VirtualizingPanel.IsVirtualizing="True"
                  VirtualizingPanel.VirtualizationMode="Recycling"
                  VirtualizingPanel.CacheLengthUnit="Item"
                  VirtualizingPanel.CacheLength="3,3"
                  ScrollViewer.IsDeferredScrollingEnabled="True"
                  ScrollViewer.CanContentScroll="True">
            <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.RowDefinitions>
                                    <RowDefinition/>
                                    <RowDefinition/>
                                </Grid.RowDefinitions>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition/>
                                    <ColumnDefinition/>
                                    <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="0" Grid.Column="3" Text="{Binding Topic}"/>
                                <TextBlock Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="4" Text="{Binding ISBN}"/>
                            </Grid>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</UserControl>


//ViewAViewModel.cs
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Text;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using WpfApp14.Models;
using WpfApp14.Services;

namespace WpfApp14.ViewModels
{
    public class ViewAViewModel : BindableBase
    {
        IIDService idService;
        INameService nameService;
        IISBNService iSBNService;
        ConcurrentDictionary<string, ImageSource> imgDicCache = new ConcurrentDictionary<string, ImageSource>();
        public ViewAViewModel(IIDService idServiceValue, INameService nameServiceValue,
            IISBNService isbnServiceValue)
        {
            ViewATitle = $"In view A now is {DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")}";
            idService = idServiceValue;
            nameService = nameServiceValue;
            iSBNService = isbnServiceValue;
            InitData();            
        }

        private void InitData()
        {
            InitSize();
            InitBooksCollection();
            Task.Run(() =>
            {
                InitTimer();
            });            
        }

        private void InitTimer()
        {
            System.Timers.Timer tmr=new System.Timers.Timer();
            tmr.Elapsed += Tmr_Elapsed;
            tmr.Interval = 1000;
            tmr.Start();
        }

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

        private void InitBooksCollection()
        {
            var imgDir = @"../../../Images";
            if (!Directory.Exists(imgDir))
            {
                return;
            }

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

            int imgsCount = imgs.Count();

            BooksCollection = new ObservableCollection<Book>();
            for (int i = 1; i < 101; i++)
            {
                BooksCollection.Add(new Book()
                {
                    Id = idService.GetID(),
                    Name = nameService.GetName(),
                    ISBN = iSBNService.GetISBN(),
                    Title = $"Title_{i}",
                    Topic = $"Topic_{i}",
                    ImgSource = GetImgSourceViaUrl(imgs[i % imgsCount])
                });
            }
        }

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

            if (imgDicCache.TryGetValue(imgUrl, out var img))
            {
                return img;
            }

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

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

        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 viewATitle;
        public string ViewATitle
        {
            get
            {
                return viewATitle;
            }
            set
            {
                SetProperty(ref viewATitle, value);
            }
        }
    }
}


//ViewB.xaml
<UserControl x:Class="WpfApp14.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:WpfApp14.Views"
             mc:Ignorable="d" 
             VerticalAlignment="Stretch"
             HorizontalAlignment="Stretch"
             xmlns:prism="http://prismlibrary.com/"
             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}"/>
        <ListBox Grid.Row="1"
                 ItemsSource="{Binding BooksCollection}"
                 VirtualizingPanel.IsVirtualizing="True"
                 VirtualizingPanel.VirtualizationMode="Recycling"
                 VirtualizingPanel.CacheLengthUnit="Item"
                 VirtualizingPanel.CacheLength="3,3"
                 ScrollViewer.IsDeferredScrollingEnabled="True"
                 ScrollViewer.CanContentScroll="True">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Grid Height="{Binding DataContext.GridHeight,RelativeSource={RelativeSource AncestorType=UserControl}}"
                          Width="{Binding DataContext.GridWidth,RelativeSource={RelativeSource AncestorType=UserControl}}">
                        <Grid.Background>
                            <ImageBrush ImageSource="{Binding ImgSource}"/>
                        </Grid.Background>
                        <Grid.RowDefinitions>
                            <RowDefinition/>
                            <RowDefinition/>
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition/>
                            <ColumnDefinition/>
                            <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="0" Grid.Column="3" Text="{Binding Topic}"/>
                        <TextBlock Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="4" Text="{Binding ISBN}"/>
                    </Grid>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</UserControl>


//ViewBViewModel.cs
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Text;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using WpfApp14.Models;
using WpfApp14.Services;

namespace WpfApp14.ViewModels
{
    public class ViewBViewModel : BindableBase
    {
        IIDService idService;
        INameService nameService;
        IISBNService isbnService;
        ConcurrentDictionary<string, ImageSource> imgDicCache = new ConcurrentDictionary<string, ImageSource>();

        public ViewBViewModel(IIDService idServiceValue, INameService nameServiceValue,
            IISBNService isbnServiceValue)
        {
            ViewBTitle = $"In view B";
            idService = idServiceValue;
            nameService = nameServiceValue;
            isbnService = isbnServiceValue;
            InitData();
        }

        private void InitData()
        {
            InitSize();
            InitBooksCollection();
            Task.Run(() =>
            {
                InitTimer();
            });
        }

        private void InitTimer()
        {
            System.Timers.Timer 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 view B now is {DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")}";
        }

        private void InitBooksCollection()
        {
            var imgDir = @"../../../Images";
            if (!Directory.Exists(imgDir))
            {
                return;
            }

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

            int imgsCount = imgs.Count();

            BooksCollection = new ObservableCollection<Book>();
            for (int i = 1; i < 101; i++)
            {
                BooksCollection.Add(new Book()
                {
                    Id = idService.GetID(),
                    Name = nameService.GetName(),
                    ISBN = isbnService.GetISBN(),
                    Title = $"Title_{i}",
                    Topic = $"Topic_{i}",
                    ImgSource = GetImgSourceViaUrl(imgs[i % imgsCount])
                });
            }
        }

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

            if (imgDicCache.TryGetValue(imgUrl, out var img))
            {
                return img;
            }

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

        private void InitSize()
        {
            var mainWin = System.Windows.Application.Current.MainWindow;
            if (mainWin == null)
            {
                return;
            }
            GridWidth = mainWin.ActualWidth;
            GridHeight = mainWin.ActualHeight / 4;
        }

        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);
            }
        }
    }
}


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

namespace WpfApp14.Services
{
    public interface IIDService
    {
        int GetID();
    }

    public class IDService:IIDService
    {
        int id = 0;

        public int GetID()
        {
            return Interlocked.Increment(ref id);
        }
    }
}


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

namespace WpfApp14.Services
{
    public interface INameService
    {
        string GetName();
    }

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

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

namespace WpfApp14.Services
{
    public interface IISBNService
    {
        string GetISBN();
    }

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

//Models/Book.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Media;

namespace WpfApp14.Models
{
    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 ImageSource ImgSource { get; set; }
    }
}