WPF ItemsControl implement Select in mvvm via behavior

<Window x:Class="WpfApp11.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:WpfApp11"xmlns:behavior="http://schemas.microsoft.com/xaml/behaviors"mc:Ignorable="d"WindowState="Maximized"Title="MainWindow" Height="450" Width="800"><Grid><ScrollViewer><ItemsControl x:Name="itemsControl" ItemsSource="{Binding ISBNSList}" ScrollViewer.CanContentScroll="True"ScrollViewer.VerticalScrollBarVisibility="Visible"ScrollViewer.IsDeferredScrollingEnabled="True"><!--<ItemsControl.ItemContainerStyle><Style TargetType="ContentPresenter"><EventSetter Event="MouseLeftButtonDown"Handler="ContentPresenter_MouseLeftButtonDown"/></Style></ItemsControl.ItemContainerStyle>--><ItemsControl.ItemTemplate><DataTemplate><Grid ShowGridLines="True"><behavior:Interaction.Triggers><behavior:EventTrigger EventName="MouseDown"><behavior:InvokeCommandActionCommand="{Binding DataContext.MouseLeftButtonDownCommand,RelativeSource={RelativeSource AncestorType=Window}}"CommandParameter="{Binding}"/></behavior:EventTrigger></behavior:Interaction.Triggers><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><Style TargetType="ColumnDefinition"><Setter Property="Width" Value="Auto"/></Style></Grid.Resources><Grid.ColumnDefinitions><ColumnDefinition/><ColumnDefinition/><ColumnDefinition/><ColumnDefinition/><ColumnDefinition/></Grid.ColumnDefinitions><TextBlock Text="{Binding Id}" Grid.Column="0"/><TextBlock Text="{Binding Name}" Grid.Column="1"/><TextBlock Text="{Binding ISBN}" Grid.Column="2"/><TextBlock Text="{Binding Title}" Grid.Column="3"/><TextBlock Text="{Binding Topic}" Grid.Column="4"/></Grid></DataTemplate></ItemsControl.ItemTemplate></ItemsControl></ScrollViewer></Grid>
</Window>private void MouseLeftButtonDownCommandExecuted(object? obj)
{var bk = obj as Book;if(bk!=null){var bkJson=  JsonConvert.SerializeObject(bk, Formatting.Indented);MessageBox.Show(bkJson);}
}

 

 

 

 

 

 

 

 

 

 

 

Install-Package Microsoft.Xaml.Behaviors.Wpf;
Install-Package Newtonsoft.Json

 

 

 

 

 

//xaml
<Window x:Class="WpfApp11.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:WpfApp11"xmlns:behavior="http://schemas.microsoft.com/xaml/behaviors"mc:Ignorable="d"WindowState="Maximized"Title="MainWindow" Height="450" Width="800"><Grid><ScrollViewer><ItemsControl x:Name="itemsControl" ItemsSource="{Binding ISBNSList}" ScrollViewer.CanContentScroll="True"ScrollViewer.VerticalScrollBarVisibility="Visible"ScrollViewer.IsDeferredScrollingEnabled="True"><!--<ItemsControl.ItemContainerStyle><Style TargetType="ContentPresenter"><EventSetter Event="MouseLeftButtonDown"Handler="ContentPresenter_MouseLeftButtonDown"/></Style></ItemsControl.ItemContainerStyle>--><ItemsControl.ItemTemplate><DataTemplate><Grid ShowGridLines="True"><behavior:Interaction.Triggers><behavior:EventTrigger EventName="MouseDown"><behavior:InvokeCommandActionCommand="{Binding DataContext.MouseLeftButtonDownCommand,RelativeSource={RelativeSource AncestorType=Window}}"CommandParameter="{Binding}"/></behavior:EventTrigger></behavior:Interaction.Triggers><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><Style TargetType="ColumnDefinition"><Setter Property="Width" Value="Auto"/></Style></Grid.Resources><Grid.ColumnDefinitions><ColumnDefinition/><ColumnDefinition/><ColumnDefinition/><ColumnDefinition/><ColumnDefinition/></Grid.ColumnDefinitions><TextBlock Text="{Binding Id}" Grid.Column="0"/><TextBlock Text="{Binding Name}" Grid.Column="1"/><TextBlock Text="{Binding ISBN}" Grid.Column="2"/><TextBlock Text="{Binding Title}" Grid.Column="3"/><TextBlock Text="{Binding Topic}" Grid.Column="4"/></Grid></DataTemplate></ItemsControl.ItemTemplate></ItemsControl></ScrollViewer></Grid>
</Window>//MainWindow.xaml.csusing System.Collections.ObjectModel;
using System.ComponentModel;
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;
using Newtonsoft.Json;namespace WpfApp11
{/// <summary>/// Interaction logic for MainWindow.xaml/// </summary>public partial class MainWindow : Window{public MainWindow(){InitializeComponent();var vm = new MainVM();this.DataContext = vm;}private void ContentPresenter_MouseLeftButtonDown(object sender, MouseButtonEventArgs e){// Implement custom selection logic herevar item = ((ContentPresenter)sender).Content;// Your selection handling code
        }}public class MainVM : INotifyPropertyChanged{public MainVM(){InitData();MouseLeftButtonDownCommand = new DelCommand(MouseLeftButtonDownCommandExecuted);}private void MouseLeftButtonDownCommandExecuted(object? obj){var bk = obj as Book;if(bk!=null){var bkJson=  JsonConvert.SerializeObject(bk, Formatting.Indented);MessageBox.Show(bkJson);}}private void InitData(){ISBNSList = new ObservableCollection<Book>();for (int i = 1; i < 1001; i++){ISBNSList.Add(new Book(){Id = i,Name = $"Name_{i}",ISBN = $"ISBN_{i}_{Guid.NewGuid():N}",Title = $"Title_{i}",Topic = $"Topic_{i}"});}}public event PropertyChangedEventHandler? PropertyChanged;private void OnPropertyChanged([CallerMemberName] string propName = ""){var handler = PropertyChanged;if (handler != null){handler?.Invoke(this, new PropertyChangedEventArgs(propName));}}private ObservableCollection<Book> iSBNSList;public ObservableCollection<Book> ISBNSList{get{return iSBNSList;}set{if (iSBNSList != value){iSBNSList = value;OnPropertyChanged();}}}public DelCommand MouseLeftButtonDownCommand { get; set; }}public class DelCommand : ICommand{private Action<object?> execute;private Predicate<object?> canExecute;public DelCommand(Action<object?> executeValue, Predicate<object?> canExecuteValue=null){execute = executeValue;canExecute = canExecuteValue;}public event EventHandler? CanExecuteChanged{add{CommandManager.RequerySuggested += value;}remove{CommandManager.RequerySuggested -= value;}}public bool CanExecute(object? parameter){return canExecute == null ? true : canExecute(parameter);}public void Execute(object? parameter){execute(parameter);}}public class Book{public int Id { get; set; }public string Name { get; set; }public string ISBN { get; set; }public string Title { get; set; }public string Topic { get; set; }}
}