Bonjour tout le monde, j'ai un petit souci en WPF avec les treeview.

pour commencer, voilà mes classes :
using PropertyChanged; using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.ComponentModel; using System.Dynamic; using System.Text; namespace Forms.Models { [AddINotifyPropertyChangedInterface] public class FormData { public string Name { get; set; } public FieldData Field { get; set; } } }

using Forms.Enum;
using PropertyChanged;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Text.Json.Serialization;
using System.Windows;

namespace Forms.Models
{
    [AddINotifyPropertyChangedInterface]
    public class FieldData
    {

        public FieldData()
        {
            HorizontalAlignement = EnumHorizontalAlignement.Stretch;
            VerticalAlignement = EnumVerticalAlignement.Stretch;
            Id = Guid.NewGuid();
            ForeGroundHexColor = string.Empty;
            BackgroundHexColor = string.Empty;
            BorderHexColor = string.Empty;
            DataValueType = new ObservableCollection<EnumDataValuesType>();
            fields = new ObservableCollection<FieldData>();
        }

        [DefaultValue("")]
        public string Name { get; set; }

        public Guid Id { get; set; }
        public EnumTypeComponent TypeComponent { get; set; }
        public EnumHorizontalAlignement HorizontalAlignement { get; set; }
        public EnumVerticalAlignement VerticalAlignement { get; set; }
        public EnumContentHorizontalAlignement ContentHorizontalAlignement { get; set; }
        public EnumContentVerticalAlignement ContentVerticalAlignement { get; set; }
        public EnumTextHorizontalAlignement TextHorizontalAlignement { get; set; }
        public EnumTextVerticalAlignement TextVerticalAlignement { get; set; }
        public EnumSpaceType HorizontalSpaceType { get; set; }
        public EnumSpaceType VerticalSpaceType { get; set; }
        public ObservableCollection<EnumDataValuesType> DataValueType { get; set; }
        public EnumFontWeight FontWeight { get; set; }
        public EnumFontSize FontSize { get; set; }

        [DefaultValue(0)]
        public int RowIndex { get; set; }

        [DefaultValue(0)]
        public int RowSpan { get; set; }

        [DefaultValue(0)]
        public int ColumnIndex { get; set; }

        [DefaultValue(0)]
        public int ColumnSpan { get; set; }

        [DefaultValue(1.0)]
        public double HorizontalSpaceUsage { get; set; }

        [DefaultValue(1.0)]
        public double VerticalSpaceUsage { get; set; }

        [DefaultValue("")]
        public string BackgroundHexColor { get; set; }

        [DefaultValue("")]
        public string ForeGroundHexColor { get; set; }

        [DefaultValue("")]
        public string BorderHexColor { get; set; }

        public Thickness Margin { get; set; }

        public Thickness BorderThickness { get; set; }

        private ObservableCollection<FieldData> fields;
        public ObservableCollection<FieldData> Fields
        {
            get
            {
                if (fields == null) fields = new ObservableCollection<FieldData>();
                return fields;
            }
            set => fields = value;
        }

        private DataValues data;
        public DataValues Data
        {
            get
            {
                if (data == null) data = new DataValues();
                return data;
            }

            set => data = value;
        }


        public bool ShouldSerializeFields()
        {
            return Fields.Count > 0;
        }

        public bool ShouldSerializeData()
        {
            return
                Data.BoolValue != default ||
                Data.ByteValue != default ||
                Data.DateValue != default ||
                Data.FloatValue != default ||
                Data.GroupValue != default ||
                Data.IntValue != default ||
                (Data.StringValue != default && !string.IsNullOrEmpty(Data.StringValue));
        }

        public override string ToString()
        {
            return Name;
        }
    }
}

Comme on peut le voir, FormData posséde un propriété de type fieldata, qui lui se contient de manière récursive,

je souhaiterai afficher le treeview de la manière suivante :

Formdata
-----Field(champs unique de formdata)
----------Fields(champ issu de Field)
---------------Fields....(Champs par récursion)

et ça c'est ma fenètre :
behind
using Forms.Models; using Forms.Tools; using Newtonsoft.Json; using PropertyChanged; using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.ComponentModel; using System.Linq; using System.Text; using System.Text.Json; using System.Threading; using System.Threading.Tasks; 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.Shapes; namespace Forms { [AddINotifyPropertyChangedInterface] public partial class FormsGenerator : Window { GeneratorHelpers generator = new GeneratorHelpers(); public FormData Formulaire { get; set; } public ObservableCollection<FormData> ListeFormulaire { get; set; } private void Window_Loaded(object sender, RoutedEventArgs e) { Formulaire = generator.GenerateData(); generator.GenerateGrid(Formulaire.Field, GridRendu); ListeFormulaire = new ObservableCollection<FormData>() { Formulaire, new FormData() { Name = "test" } }; } private void Button_Click(object sender, RoutedEventArgs e) { ClearGrid(); generator.GenerateGrid(Formulaire.Field, GridRendu); } private void ClearGrid() { GridRendu.Children.Clear(); GridRendu.ColumnDefinitions.Clear(); GridRendu.RowDefinitions.Clear(); } private void ButtonAddChildren_Click(object sender, RoutedEventArgs e) { FieldData field = (sender as Button).DataContext as FieldData; var child = new FieldData() { Name = "Unknow" }; field.Fields.Add(child); } private void ButtonRemoveChildren_Click(object sender, RoutedEventArgs e) { } } }

Xaml

<Window x:Class="Forms.FormsGenerator"
        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:Models="clr-namespace:Forms.Models"
        xmlns:UserControls="clr-namespace:Forms.UserControls"
        xmlns:local="clr-namespace:Forms"
        mc:Ignorable="d"
        Title="FormsGenerator" Height="1080" Width="1920" WindowState="Maximized" Loaded="Window_Loaded"
        x:Name="CurrentWindow">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="0.75*"/>
            <ColumnDefinition Width="2*"/>
        </Grid.ColumnDefinitions>
        <Grid Grid.Column="0" x:Name="gridJson" Background="White">
            <Grid.RowDefinitions>
                <RowDefinition Height="*"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <TreeView Grid.Row="0" x:Name="TreeViewField" Margin="10" ItemsSource="{Binding  ElementName=CurrentWindow,Path=ListeFormulaire,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">
                <TreeView.ItemTemplate>
                    <HierarchicalDataTemplate DataType="{x:Type Models:FormData}" >
                        <TextBlock Text="{Binding Name}"/>
                        <HierarchicalDataTemplate.ItemTemplate>
                            <HierarchicalDataTemplate  DataType="{x:Type Models:FieldData}"  ItemsSource="{Binding Field}">
                                <TextBlock Text="{Binding Name}"/>
                                <HierarchicalDataTemplate.ItemTemplate>
                                    <HierarchicalDataTemplate DataType="{x:Type Models:FieldData}" ItemsSource="{Binding Fields,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" >
                                        <TextBlock Text="{Binding Name}"/>
                                    </HierarchicalDataTemplate>
                                </HierarchicalDataTemplate.ItemTemplate>
                            </HierarchicalDataTemplate>
                        </HierarchicalDataTemplate.ItemTemplate>
                    </HierarchicalDataTemplate>
                </TreeView.ItemTemplate>
            </TreeView>
            <UserControls:UserControlEditFormData Grid.Row="1" DataContext="{Binding ElementName=TreeViewField,Path=SelectedItem}"/>
        </Grid>
        <Grid Grid.Column="1" Background="#2980b9">
            <Grid.RowDefinitions>
                <RowDefinition Height="*"/>
                <RowDefinition Height="auto"/>
            </Grid.RowDefinitions>
            <Grid Margin="20" Grid.Row="0" x:Name="GridRendu"/>
            <Button Grid.Row="1" Content="Generer rendu" Width="200" HorizontalAlignment="Right" Margin="10" Height="30" Click="Button_Click"/>
        </Grid>
    </Grid>
</Window>

Je pensais avoir trouvé la solution avec ça : https://stackoverflow.com/questions/23896442/multiple-hierarchicaldatatemplate

mais c'est visiblement une mauvaise pioche... des idées ?