using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;

namespace WcfService1
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IBookService" in both code and config file together.
    [ServiceContract]
    public interface IBookService
    {
        [OperationContract]
        [WebGet(UriTemplate="/GetBooksList?cnt={cnt}",RequestFormat =WebMessageFormat.Json, ResponseFormat =WebMessageFormat.Json)]
        List<Book> GetBooksList(int cnt);
    }

    [DataContract]
    public class Book
    {
        [DataMember]
        public long Id { get; set; }
        [DataMember]
        public string Name { get; set; }
        [DataMember]
        public string ISBN { get; set; }
        [DataMember]
        public string Comment { get; set; }
        [DataMember]
        public string Content { get; set; }
        [DataMember]
        public string Author { get; set; }
        [DataMember]
        public string Abstract { get; set; }
        [DataMember]
        public string Summary { get; set; }
        [DataMember]
        public string Title { get; set; }
        [DataMember]
        public string Topic { get; set; }
    }
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.Threading;

namespace WcfService1
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "BookService" in code, svc and config file together.
    // NOTE: In order to launch WCF Test Client for testing this service, please select BookService.svc or BookService.svc.cs at the Solution Explorer and start debugging.
    public class BookService : IBookService
    {
        private static long id = 0;
        private static long GetIncrementId()
        {
            return Interlocked.Increment(ref id);
        }

        public List<Book> GetBooksList(int cnt)
        {
            List<Book> bksList = new List<Book>();
            for(int i=0;i<cnt;i++)
            {
                var a = GetIncrementId();
                bksList.Add(new Book()
                {
                    Id=a,
                    Name=$"Name_{a}",
                    ISBN=$"ISBN_{a}_{Guid.NewGuid():N}",
                    Author=$"Author_{a}",
                    Abstract=$"Abstract_{a}",
                    Comment=$"Comment_{a}",
                    Content=$"Content_{a}",
                    Summary=$"Summary_{a}",
                    Title=$"Title_{a}",
                    Topic=$"Topic_{a}"
                });
            }
            return bksList;
        }
    }
}




<?xml version="1.0"?>
<configuration>

    <appSettings>
        <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
    </appSettings>
    <system.web>
        <compilation debug="true" targetFramework="4.8" />
        <httpRuntime targetFramework="4.8"/>
    </system.web>
    <system.serviceModel>
        <bindings>
            <webHttpBinding>
                <binding name="booksWebHttpBinding"
                         sendTimeout="00:10:00" 
                         receiveTimeout="00:10:00" 
                         openTimeout="00:10:00"
                         closeTimeout="00:10:00"
                         maxReceivedMessageSize="2147483647"
                         maxBufferSize="2147483647"
                         maxBufferPoolSize="21484637">
                    <readerQuotas maxStringContentLength="2147483647"
                                  maxNameTableCharCount="2147483647"
                                  maxDepth="2147483647"
                                  maxBytesPerRead="2147483647"
                                  maxArrayLength="2147483647"/>
                    <security mode="None"/>
                </binding>
            </webHttpBinding>
        </bindings>
        <behaviors>
            <serviceBehaviors>
                <behavior name="booksServerBehavior">
                    <!-- To avoid disclosing metadata information, set the values below to false before deployment -->
                    <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
                    <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
                    <serviceDebug includeExceptionDetailInFaults="false"/>
                </behavior>
            </serviceBehaviors>
            <endpointBehaviors>
                <behavior name="booksEndPointBehavior">
                    <webHttp/>
                </behavior>
            </endpointBehaviors>
        </behaviors>
        <services>
            <service name="WcfService1.BookService"
                     behaviorConfiguration="booksServerBehavior">
                <endpoint address=""
                          bindingConfiguration="booksWebHttpBinding" 
                          binding="webHttpBinding"
                          behaviorConfiguration="booksEndPointBehavior"
                          contract="WcfService1.IBookService"/>
            </service>
        </services>
        <protocolMapping>
            <add binding="basicHttpsBinding" scheme="https" />
        </protocolMapping>
        <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
    </system.serviceModel>
    <system.webServer>
        <modules runAllManagedModulesForAllRequests="true"/>
        <!--
        To browse web app root directory during debugging, set the value below to true.
        Set to false before deployment to avoid disclosing web app folder information.
      -->
        <directoryBrowse enabled="true"/>
    </system.webServer>

</configuration>

<Window x:Class="WpfApp1.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:WpfApp1"
        mc:Ignorable="d"
        Title="{Binding MainTitle}" WindowState="Maximized">
    <Window.DataContext>
        <local:MainVM/>
    </Window.DataContext>
    <Grid>
        <DataGrid ItemsSource="{Binding BooksCollection}"
                  VirtualizingPanel.IsVirtualizing="True"
                  VirtualizingPanel.VirtualizationMode="Recycling"
                  VirtualizingPanel.CacheLength="5,5"
                  VirtualizingPanel.CacheLengthUnit="Item"
                  UseLayoutRounding="True"
                  SnapsToDevicePixels="True"
                  AutoGenerateColumns="True"
                  CanUserAddRows="False"
                  EnableRowVirtualization="True"
                  EnableColumnVirtualization="True"
                  ScrollViewer.IsDeferredScrollingEnabled="True"
                  ScrollViewer.CanContentScroll="True">
            <DataGrid.Resources>
                <Style TargetType="DataGridRow">
                    <Setter Property="FontSize" Value="30"/>
                    <Style.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="FontSize" Value="40"/>
                            <Setter Property="Foreground" Value="Red"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.Resources>
            <DataGrid.ContextMenu>
                <ContextMenu>
                    <MenuItem Header="Load Data"
                              FontSize="30"
                              Command="{Binding LoadCmd}"/>
                </ContextMenu>
            </DataGrid.ContextMenu>
        </DataGrid>
    </Grid>
</Window>

using Newtonsoft.Json;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Diagnostics;
using System.Net.Http;
using System.Runtime.CompilerServices;
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 WpfApp1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }

    public class MainVM : INotifyPropertyChanged
    {        
        private static long id = 0;
        private HttpClient client;
        string url = "http://localhost:62310/BookService.svc/getbooksList?cnt=";
        public MainVM()
        {
            if (!DesignerProperties.GetIsInDesignMode(new DependencyObject()))
            {             
                client=new HttpClient();
                _ = LoadDataLoopsAsync();
            }
        }

        private async Task LoadDataLoopsAsync()
        {
            while (true)
            {
                try
                {
                    await LoadDataAsync();
                }
                catch (Exception ex)
                {
                    Debug.WriteLine($"{DateTime.Now},{ex.Message}");
                }
                await Task.Delay(20000);
            }
        }

        private async Task LoadDataAsync(int cnt=2000000)
        {
            string jsonStr =await client.GetStringAsync($"{url}{cnt}");
            List<Book> bksList = JsonConvert.DeserializeObject<List<Book>>(jsonStr);            
            
            await Application.Current.Dispatcher.InvokeAsync(() =>
            {
                BooksCollection = new ObservableCollection<Book>(bksList);
                bksList.Clear();
                MainTitle = $"{DateTime.Now},loaded {BooksCollection.Count} items,first Id:{BooksCollection.FirstOrDefault()?.Id},last Id:{BooksCollection.LastOrDefault()?.Id}";
            }, System.Windows.Threading.DispatcherPriority.Background);
        }

        private static long GetIncrementId()
        {
            return Interlocked.Increment(ref id);
        }

        private string mainTitle;
        public string MainTitle
        {
            get
            {
                return mainTitle;
            }
            set
            {
                if (value != mainTitle)
                {
                    mainTitle = value;
                    OnPropertyChanged();
                }
            }
        }

        private ObservableCollection<Book> booksCollection;
        public ObservableCollection<Book> BooksCollection
        {
            get
            {
                return booksCollection;
            }
            set
            {
                if (value != booksCollection)
                {
                    booksCollection = value;
                    OnPropertyChanged();
                }
            }
        }

        public event PropertyChangedEventHandler? PropertyChanged;
        private void OnPropertyChanged([CallerMemberName] string propName = "")
        {
            var handler = PropertyChanged;
            handler?.Invoke(this, new PropertyChangedEventArgs(propName));
        }
    }

    public class Book
    {
        public long Id { get; set; }
        public string Name { get; set; }
        public string ISBN { get; set; }
        public string Comment { get; set; }
        public string Content { get; set; }
        public string Author { get; set; }
        public string Abstract { get; set; }
        public string Summary { get; set; }
        public string Title { get; set; }
        public string Topic { get; set; }
    }
}