WPF datagrid datagridrow occupy the whole screen width

//xaml
<DataGrid.Columns>
    <DataGridTemplateColumn>
        <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
                <Grid ShowGridLines="True"
                    Width="{Binding DataContext.RowWidth,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged,
            RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type Window}}}">
                    <Grid.RowDefinitions>
                        <RowDefinition/>
                        <RowDefinition/>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition/>
                        <ColumnDefinition/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>
                    <Grid.Resources>
                        <Style TargetType="TextBlock">
                            <Setter Property="HorizontalAlignment" Value="Center"/>
                            <Setter Property="VerticalAlignment" Value="Center"/>
                        </Style>
                    </Grid.Resources>
                    <TextBlock Text="{Binding Id}" Grid.Row="0" Grid.Column="0"/>
                    <TextBlock Text="{Binding Name}" Grid.Row="0" Grid.Column="1"/>
                    <TextBlock Text="{Binding Title}" Grid.Row="0" Grid.Column="2"/>
                    <TextBlock Text="{Binding ISBN}" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="3"/>
                </Grid>
            </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
</DataGrid.Columns>



//cs
private double rowWidth;
public double RowWidth
{
    get
    {   
        return rowWidth;
    }
    set
    {
        if(value!=rowWidth)
        {
            rowWidth = value;
            OnPropertyChanged();
        }
    }
}



 public class MainVM : INotifyPropertyChanged
 {
     private Window win;
     private FrameworkElement fe;
     public MainVM(Window winValue)
     {
         win=winValue;
         if(win!=null)
         {
             win.Loaded+=Win_Loaded;
         }             
     }

     private void Win_Loaded(object sender, RoutedEventArgs e)
     {
         var tempFe = win.Content as FrameworkElement;
         if(tempFe!=null)
         {
             fe=tempFe;
             RowWidth = fe.ActualWidth;
             InitBooksCollection();
         }
     }
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

//xaml
<Window x:Class="WpfApp2.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:WpfApp2"
        mc:Ignorable="d"
        WindowState="Maximized"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <DataGrid ItemsSource="{Binding BooksCollection,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                  VirtualizingPanel.IsVirtualizing="True"
                  VirtualizingPanel.IsContainerVirtualizable="True"
                  VirtualizingPanel.CacheLength="1"
                  VirtualizingPanel.CacheLengthUnit="Item"
                  VirtualizingPanel.VirtualizationMode="Recycling"
                  SnapsToDevicePixels="True"
                  CanUserAddRows="False"
                  AutoGenerateColumns="False">
            <DataGrid.Resources>
                <Style TargetType="{x:Type DataGridRow}">
                    <Setter Property="Height" Value="300"/>
                    <Setter Property="Foreground" Value="Blue"/>
                    <Setter Property="FontSize" Value="30"/>
                    <Setter Property="HorizontalAlignment" Value="Center"/>
                    <Setter Property="Width" Value="{Binding DataContext.RowWidth,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged,
                        RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type Window}}}"/>
                    <Style.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="FontSize" Value="80"/>
                            <Setter Property="Foreground" Value="Red"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.Resources>
            <DataGrid.Columns>
                <DataGridTemplateColumn>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Grid ShowGridLines="True"
                                Width="{Binding DataContext.RowWidth,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged,
                        RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type Window}}}">
                                <Grid.RowDefinitions>
                                    <RowDefinition/>
                                    <RowDefinition/>
                                </Grid.RowDefinitions>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition/>
                                    <ColumnDefinition/>
                                    <ColumnDefinition/>
                                </Grid.ColumnDefinitions>
                                <Grid.Resources>
                                    <Style TargetType="TextBlock">
                                        <Setter Property="HorizontalAlignment" Value="Center"/>
                                        <Setter Property="VerticalAlignment" Value="Center"/>
                                    </Style>
                                </Grid.Resources>
                                <TextBlock Text="{Binding Id}" Grid.Row="0" Grid.Column="0"/>
                                <TextBlock Text="{Binding Name}" Grid.Row="0" Grid.Column="1"/>
                                <TextBlock Text="{Binding Title}" Grid.Row="0" Grid.Column="2"/>
                                <TextBlock Text="{Binding ISBN}" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="3"/>
                            </Grid>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>


//cs
using 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;

namespace WpfApp2
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            var vm = new MainVM(this);
            this.DataContext=vm;
        }
    }

    public class MainVM : INotifyPropertyChanged
    {
        private Window win;
        private FrameworkElement fe;
        public MainVM(Window winValue)
        {
            win=winValue;
            if(win!=null)
            {
                win.Loaded+=Win_Loaded;
            }             
        }

        private void Win_Loaded(object sender, RoutedEventArgs e)
        {
            var tempFe = win.Content as FrameworkElement;
            if(tempFe!=null)
            {
                fe=tempFe;
                RowWidth = fe.ActualWidth;
                InitBooksCollection();
            }
        }

        private void InitBooksCollection()
        {
            List<Book> booksList = new List<Book>();
            for (int i = 0; i<100000; i++)
            {
                booksList.Add(new Book()
                {
                    Id=i+1,
                    Name=$"Name_{i+1}",
                    Title=$"Title_{i+1}",
                    ISBN=$"ISBN_{Guid.NewGuid().ToString("N")}"
                });
            }

            BooksCollection=new ObservableCollection<Book>(booksList);
        }

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

        private double rowWidth;
        public double RowWidth
        {
            get
            {   
                return rowWidth;
            }
            set
            {
                if(value!=rowWidth)
                {
                    rowWidth = value;
                    OnPropertyChanged();
                }
            }
        }

    }


    public class Book
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Title { get; set; }
        public string ISBN { get; set; }
        public ImageSource ImgSource { get; set; }
    }
}