How to count for each category in uwp

I have the following xaml code that generates the UI. You can see the screenshot. I would like to count the quantity for each plat let's say for my image plat 2 has 5qt and plat 1 has 3qt and plat 3 has 3qt.

Here is the code that I would like to change instead of x, y and z I would like to have the quantity for each plat.

<TextBlock Text="There are x plat1, y plat2 and z plat3"
           Style="{StaticResource BaseTextBlockStyle}" />

Here is my full xaml code

<Page x:Class="TakeOutUI.GestionCommandes"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:local="using:TakeOutUI"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
      mc:Ignorable="d"
      Background="#eee">

    <ScrollViewer>
        <Grid Margin="30,0, 30, 30">
            <StackPanel>
                <TextBlock Text="Commandes à préparer"
                           Style="{StaticResource Titre1}" />
                <StackPanel Orientation = "Horizontal">
                    <Button x:Name="sortBtn"  Content="Date Λ"  VerticalAlignment="Top" Click = "OnSortDateClick"/>
                    <CheckBox  x:Name="chkVoirTouts"  Content="Voir tout les commandes"  Click = "OnVoirTouts" />
                    <Button Content="+" HorizontalAlignment="Stretch" Click="Nav_AjoutCommande" />
                </StackPanel>
                <TextBlock Text="There are x plat1, y plat2 and z plat3"
                           Style="{StaticResource BaseTextBlockStyle}" />
                <ListView x:Name="ListCommandes">
                    <ListView.ItemContainerStyle>
                        <Style TargetType="ListViewItem">
                            <Setter Property="HorizontalContentAlignment"
                                    Value="Stretch" />
                            <Setter Property="VerticalAlignment"
                                    Value="Stretch" />
                            <Setter Property="HorizontalAlignment"
                                    Value="Stretch" />
                            <Setter Property="Margin"
                                    Value="0, 10, 0,0" />
                            <Setter Property="Background"
                                    Value="#fff" />
                        </Style>
                    </ListView.ItemContainerStyle>
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <Grid Padding="5,15">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="*" />
                                    <ColumnDefinition Width="*" />
                                    <ColumnDefinition Width="60" />
                                </Grid.ColumnDefinitions>

                                <StackPanel  Grid.Column="0">
                                    <TextBlock Text="{Binding NomCommande}"
                                               Style="{StaticResource Titre3}" />
                                    <TextBlock>
                                        <Run Text="Date :"
                                             FontWeight="Bold" />
                                        <Run Text="{Binding DateCommande}" />
                                    </TextBlock>
                                </StackPanel>

                                <StackPanel  Grid.Column="1">
                                    <TextBlock Text="Plats à préparer :"
                                               Style="{StaticResource Titre3}" />

                                    <ListView ItemsSource="{Binding ItemsCommande}">
                                        <ListView.ItemContainerStyle>
                                            <Style TargetType="ListViewItem">
                                                <Setter Property="HorizontalContentAlignment"
                                                        Value="Stretch" />
                                            </Style>
                                        </ListView.ItemContainerStyle>
                                        <ListView.ItemTemplate>
                                            <DataTemplate>
                                                <Grid>
                                                    <Grid.ColumnDefinitions>
                                                        <ColumnDefinition Width="40" />
                                                        <ColumnDefinition Width="60" />
                                                        <ColumnDefinition Width="*" />
                                                    </Grid.ColumnDefinitions>
                                                    <FontIcon Grid.Column="0" FontFamily="Segoe MDL2 Assets"
                                                              Glyph="&#xF127;" />
                                                    <TextBlock Grid.Column="1">
                                                        <Run Text="Qté :"
                                                             FontWeight="Bold" />
                                                        <Run Text="{Binding QuantitePlat}" />
                                                    </TextBlock>
                                                    <TextBlock Grid.Column="2">
                                                        <Run Text="Plat :"
                                                             FontWeight="Bold" />
                                                        <Run Text="{Binding PlatId}" />
                                                    </TextBlock>
                                                </Grid>
                                            </DataTemplate>
                                        </ListView.ItemTemplate>
                                    </ListView>
                                </StackPanel>
                            </Grid>

                        </DataTemplate>
                    </ListView.ItemTemplate>
                </ListView>


            </StackPanel>
        </Grid>
    </ScrollViewer>
</Page>

Here are my 3 models

Commande

public class Commande
{
    [Key]
    public int IdCommande { get; set; }

    public Commande()
    {
        ItemsCommande = new Collection<ItemCommande>();
    }

    public string NomCommande { get; set; }
    public DateTime DateCommande { get; set; }
    public ICollection<ItemCommande> ItemsCommande { get; set; }

}

ItemCommande

public class ItemCommande
{
    [Key]
    public int IdDetailCommande { get; set; }
    public int QuantitePlat { get; set; }

    [ForeignKey("Commande")]
    public int CommandeId { get; set; }
    public Commande Commande { get; set; }

    [ForeignKey("Plat")]
    public int PlatId { get; set; }
    public Plat Plat {
        get; 
        set; 
    }
}

and Plat

public class Plat
{
    [Key]
    public int IdPlat { get; set; }
    public string NomPlat { get; set; }
}

And here is my context

public class Contexte : DbContext
{
    private static bool _created = false;
    public Contexte()
    {
        if (!_created)
        {
            _created = true;
            Database.EnsureDeleted();
            Database.EnsureCreated();
            InitialisateurBD.Seed();
        }
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Plat>();
        modelBuilder.Entity<Commande>();
        modelBuilder.Entity<ItemCommande>();
        base.OnModelCreating(modelBuilder);
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionbuilder)
    {
        optionbuilder.UseSqlite(@"Data Source=TakeOut.db");
    }

    public DbSet<Plat> Plats { get; set; }
    public DbSet<Commande> Commandes { get; set; }
    public DbSet<ItemCommande> ItemsCommandes { get; set; }

}

Thank you for your help.