WPF ListBox ItemTemplate load data from ASP..Net Core WebAPI

//WPF
Install-Package Newtonsoft.json

　　

<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>
    <Window.Resources>
        <local:LenConverter x:Key="LenConverter"/>
        <Style TargetType="TextBlock" x:Key="TbkStyle">
            <Setter Property="FontSize" Value="20"/>
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="Foreground" Value="Red"/>
                    <Setter Property="FontWeight" Value="ExtraBold"/>
                </Trigger>
            </Style.Triggers>
        </Style>

        <DataTemplate DataType="{x:Type local:Book}"
                      x:Key="BookDataTemplate">
            <Border BorderBrush="Cyan"
                    BorderThickness="2"
                    Margin="5">
                <Grid Margin="5"
                      Width="{Binding Source={x:Static SystemParameters.PrimaryScreenWidth},
                    Converter={StaticResource LenConverter},ConverterParameter=2}">
                    <Grid.RowDefinitions>
                        <RowDefinition/>
                        <RowDefinition/>
                        <RowDefinition/>
                        <RowDefinition/>
                        <RowDefinition/>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>
                    <Grid.Resources>
                        <Style TargetType="TextBlock" BasedOn="{StaticResource TbkStyle}"/>
                    </Grid.Resources>
                    <TextBlock Grid.Row="0" Grid.Column="0" Text="{Binding Id}"/>
                    <TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding Name}"/>
                    <TextBlock Grid.Row="1" Grid.Column="0" Text="{Binding Author}"/>
                    <TextBlock Grid.Row="1" Grid.Column="1" Text="{Binding Comment}"/>
                    <TextBlock Grid.Row="2" Grid.Column="0" Text="{Binding Content}"/>
                    <TextBlock Grid.Row="2" Grid.Column="1" Text="{Binding Author}"/>
                    <TextBlock Grid.Row="3" Grid.Column="0" Text="{Binding Summary}"/>
                    <TextBlock Grid.Row="3" Grid.Column="1" Text="{Binding Title}"/>
                    <TextBlock Grid.Row="4" Grid.Column="0" Text="{Binding Topic}"/>
                    <TextBlock Grid.Row="4" Grid.Column="1" Text="{Binding CategoryName}"/>
                </Grid>
            </Border>
        </DataTemplate>

        
    </Window.Resources>
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <ListBox Grid.Column="0"
                 ItemsSource="{Binding BksCollection}"
                 ItemTemplate="{StaticResource BookDataTemplate}"/>

        <ListBox Grid.Column="1"
          ItemsSource="{Binding BksCollection}"
          ItemTemplate="{StaticResource BookDataTemplate}"/>
    </Grid>
</Window>



using Newtonsoft.Json;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Globalization;
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
    {
        static string url = "http://172.17.0.145:5000/getbooks/1000000";
        static HttpClient client = new HttpClient()
        {
            Timeout = TimeSpan.FromSeconds(60)
        };

        private static bool isLoading = false;

        public MainVM()
        {
            if (!DesignerProperties.GetIsInDesignMode(new DependencyObject()))
            {
                _ = LoadDataAsync();
            }
        }

        private async Task LoadDataAsync()
        {
            if (isLoading)
            {
                return;
            }
            isLoading = true;
            MainTitle = $"{DateTime.Now},loading...";
            try
            {
                string jsonStr = await client.GetStringAsync(url);
                if (!string.IsNullOrWhiteSpace(jsonStr))
                {
                    var bks = JsonConvert.DeserializeObject<List<Book>>(jsonStr);
                    if (bks != null && bks.Any())
                    {
                        BksCollection = new ObservableCollection<Book>(bks);
                        MainTitle = $"{DateTime.Now},loaded {BksCollection.Count} items," +
                            $"FirstId:{bks.FirstOrDefault()?.Id}," +
                            $"LastId:{bks.LastOrDefault()?.Id}";
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex?.Message);
            }
            finally
            {
                isLoading = false;
            }
        }

        private string mainTitle = $"{DateTime.Now},loading...";
        public string MainTitle
        {
            get
            {
                return mainTitle;
            }
            set
            {
                if (value != mainTitle)
                {
                    mainTitle = value;
                    OnPropertyChanged();
                }
            }
        }

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

        public event PropertyChangedEventHandler? PropertyChanged;
        private void OnPropertyChanged([CallerMemberName] string propName = "")
        {
            var handler = Volatile.Read(ref PropertyChanged);
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propName));
            }
        }
    }


    public class LenConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (double.TryParse(value?.ToString(), out double result))
            {
                return result / 2;
            }
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    public class Book
    {
        public long 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 string CategoryName { get; set; }
    }
}

　　

 

 

 

 

 

 

//WebAPI

//D:\C\WebApplication1\Models\Book.cs
namespace WebApplication1.Models
{
    public class Book
    {
        public long 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 string CategoryName { get; set; }
    }

    enum BookCategory
    {
        Science, Technology, Engineering, Math
    }
}



//D:\C\WebApplication1\Controllers\BooksController.cs
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class BooksController : ControllerBase
    {
        private static string[] enumNames = Enum.GetNames(typeof(BookCategory));
        private static int enumLen = enumNames.Length;
        private static long id = 1;
        private static (long,long) GetStartEnd(int cnt=1000000)
        {
            long end = Interlocked.Add(ref id, cnt);
            long start = end - cnt;
            return (start, end);
        }

        [HttpGet("/getbooks/{cnt}")]
        public List<Book> GetBooks(int cnt=1000000)
        {
            List<Book> bksList = new List<Book>(cnt);
            var (start, end) = GetStartEnd(cnt);
            for(long i=start;i<end;i++)
            {
                bksList.Add(new Book()
                {
                    Id=i,
                    Name=$"Name_{i}",
                    ISBN=$"ISBN_{i}_{Guid.NewGuid():N}",
                    Author=$"Author_{i}",
                    Comment=$"Comment_{i}",
                    Content=$"Content_{i}",
                    Summary=$"Summary_{i}",
                    Title=$"Title_{i}",
                    Topic=$"Topic_{i}",
                    CategoryName = $"{enumNames[i%enumLen]}"
                });
            }
            Console.WriteLine($"In ASP.Net Core WebAPI,{DateTime.Now},FirstId:{start},end:{end-1}");
            return bksList;
        }
    }
}


//D:\C\WebApplication1\Program.cs

namespace WebApplication1
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var builder = WebApplication.CreateBuilder(args);
            builder.WebHost.UseKestrel(x =>
            {
                x.ListenAnyIP(5000);
                x.ListenAnyIP(5001, o =>
                {
                    o.UseHttps();
                });
            });
            // Add services to the container.

            builder.Services.AddControllers();
            // Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
            builder.Services.AddOpenApi();

            var app = builder.Build();

            // Configure the HTTP request pipeline.
            if (app.Environment.IsDevelopment())
            {
                app.MapOpenApi();
            }

            //app.UseHttpsRedirection();

            app.UseAuthorization();


            app.MapControllers();

            app.Run();
        }
    }
}