Extraction attribut autocad vers Excel

Bonjour,

Tout d’abord je tiens à préciser que je suis débutant en terme de programmation sur visual basic.

Je souhaiterai modifier le programme (voir fichiers classes ci jointes) afin d'exporter mes attribut dans la feuille 2 d'un fichier excel existant (sans écraser les données des autres feuilles).
Actuellement le programme enregistre les données extraites dans un nouveau fichier xls (si le nom du fichier n'existe pas) ou écrase le fichier (si le nom du fichier existe déjà).

Le but serai d'exporter les attributs dans la feuil2 d'un fichier .xls existant afin d'avoir de garder les formules dans la feuil1 (formules en liaison avec feuil2)

Code de la class "command"

Code:

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using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Windows;
using ExcelLateBinding;
using AcAp = Autodesk.AutoCAD.ApplicationServices.Application;
 
namespace ExcelAttribute
{
    public class Commands
    {
        private string _expMsg, _dispMsg, _impMsg;
        private bool _fr = Thread.CurrentThread.CurrentCulture.Name.StartsWith("fr");
        private Database _db = HostApplicationServices.WorkingDatabase;
        private Editor _ed = AcAp.DocumentManager.MdiActiveDocument.Editor;
 
        public Commands()
        {
            _expMsg = _fr ? "Extraction d'attributs" : "Attributes Extract";
            _dispMsg = _fr ? "Ouvrir le fichier Excel ?" : "Open Excel file ?";
            _impMsg = _fr ? "Importation d'attributs" : "Attributes Import";
        }
 
        [CommandMethod("EATT", CommandFlags.UsePickSet)]
        public void ExportAttributes()
        {
            TypedValue[] filter = new TypedValue[2] { new TypedValue(0, "INSERT"), new TypedValue(66, 1) };
            PromptSelectionResult psr = _ed.GetSelection(new SelectionFilter(filter));
            if (psr.Status != PromptStatus.OK) return;
 
            string path = (string)AcAp.GetSystemVariable("DWGNAME");
            path = string.Format("{0}{1}.xls", AcAp.GetSystemVariable("DWGPREFIX"), path.Substring(0, path.LastIndexOf('.')));
            SaveFileDialog dlg = new SaveFileDialog(_expMsg, path, "xls;xlsx", "", 0);
            if (dlg.ShowDialog() != System.Windows.Forms.DialogResult.OK) return;
            string filename = dlg.Filename;
 
            System.Data.DataTable table = new System.Data.DataTable();
            table.Columns.Add("HANDLE", typeof(String));
            table.Columns.Add("NOM", typeof(String));
            using (Transaction tr = _db.TransactionManager.StartTransaction())
            {
                foreach (SelectedObject so in psr.Value)
                {
                    BlockReference br = tr.GetObject(so.ObjectId, OpenMode.ForRead) as BlockReference;
                    BlockTableRecord btr = br.IsDynamicBlock ?
                        (BlockTableRecord)tr.GetObject(br.DynamicBlockTableRecord, OpenMode.ForRead) :
                        (BlockTableRecord)tr.GetObject(br.BlockTableRecord, OpenMode.ForRead);
                    table.Rows.Add(new string[2] { br.Handle.ToString(), btr.Name });
                    foreach (KeyValuePair<string, string> pair in GetAttributes(br, tr))
                    {
                        if (!table.Columns.Contains(pair.Key))
                            table.Columns.Add(pair.Key, typeof(String));
                        table.Rows[table.Rows.Count - 1][pair.Key] = pair.Value;
                    }
                }
            }
            ExcelWriter xlw = new ExcelWriter();
            try
            {
                xlw.Open(filename);
                if (File.Exists(filename))
                    xlw.Clear();
                object columns = LateBindings.Get(xlw.Worksheet, "Columns");
                for (int i = 0; i < table.Columns.Count; i++)
                {
                    xlw.Write(table.Columns[i].ColumnName);
                }
                xlw.NewLine();
                for (int i = 0; i < table.Rows.Count; i++)
                {
                    xlw.WriteLine(table.Rows[i].ItemArray);
                }
                LateBindings.Invoke(columns, "AutoFit");
                xlw.Save();
                if (System.Windows.Forms.MessageBox.Show(
                    _dispMsg,
                    _expMsg,
                    System.Windows.Forms.MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.Yes)
                {
                    LateBindings.Set(xlw.Application, "DisplayAlerts", true);
                    LateBindings.Set(xlw.Application, "Visible", true);
                    LateBindings.Set(xlw.Application, "UserControl", true);
                }
                else
                {
                    xlw.Close();
                }
            }
            catch (System.Exception e)
            {
                xlw.Close();
                _ed.WriteMessage("\n{0}\n{1}", e.Message, e.StackTrace);
            }
        }

Code de la class "excelWriter"

Code:

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using System;
using System.IO;
 
namespace ExcelLateBinding
{
    public class ExcelWriter
    {
        // Champs
        private object m_Application;
        private object m_Workbook;
        private object m_Worksheet;
        private object _mis = Type.Missing;
        private int m_ColumnCount;
        private int m_ColumnIndex;
        private int m_RowCount;
        private int m_RowIndex;
        private bool m_StreamEnded;
        private string m_filename;
 
        // Constructeur
        public ExcelWriter()
        {
            m_StreamEnded = false;
            m_ColumnCount = -1;
            m_ColumnIndex = -1;
            m_RowCount = -1;
            m_RowIndex = -1;
        }
 
        // Propriétés
 
        public object Application
        {
            get { return m_Application; }
        }
 
        public object Workbook
        {
            get { return m_Workbook; }
        }
 
        public object Worksheet
        {
            get { return m_Worksheet; }
        }
 
        public bool StreamEnded
        {
            get { return m_StreamEnded; }
        }
 
        public string Version
        {
            get { return (string)LateBindings.Get(m_Application, "Version"); }
        }
 
        // Méthodes
 
        // Ferme le processus Excel
        public void Close()
        {
            if (m_Workbook != null)
            {
                LateBindings.Invoke(m_Workbook, "Close", new object[3] { false, _mis, _mis });
                m_Workbook = null;
            }
            if (m_Application != null)
            {
                LateBindings.Set(m_Application, "DisplayAlerts", true);
                LateBindings.Invoke(m_Application, "Quit");
                LateBindings.ReleaseInstance(m_Application);
                m_Application = null;
            }
        }
 
        // Supprime le contenu de toute la feuille
        public void Clear()
        {
            LateBindings.Invoke(LateBindings.Get(m_Worksheet, "Cells"), "Clear");
        }
 
        // Enregistre le fichier
        public void Save()
        {
            if (File.Exists(m_filename))
                LateBindings.Invoke(m_Workbook, "Save");
            else
            {
                int fileFormat =
                    string.Compare("11.0", this.Version) < 0 &&
                    m_filename.EndsWith(".xlsx", StringComparison.CurrentCultureIgnoreCase) ?
                    51 : -4143;
                object[] param =
                    new object[8] { m_filename, fileFormat, string.Empty, string.Empty, false, false, 1, 1 };
                LateBindings.Invoke(m_Workbook, "SaveAs", param);
            }
        }
 
        // Ouvre le processus Excel et le fichier donné (surchargé)
        public void Open(string filename)
        {
            Open(filename, null);
        }
 
        public void Open(string filename, string worksheetName)
        {
            m_Application = LateBindings.GetOrCreateInstance("Excel.Application");
 
            LateBindings.Set(m_Application, "DisplayAlerts", false);
 
            object workbooks = LateBindings.Get(m_Application, "Workbooks");
 
            m_filename = filename;
            if (File.Exists(filename))
                m_Workbook = LateBindings.Invoke(workbooks, "Open", filename);
            else
                m_Workbook = LateBindings.Invoke(workbooks, "Add", _mis);
 
            if (string.IsNullOrEmpty(worksheetName))
                m_Worksheet = LateBindings.Get(m_Workbook, "Activesheet");
            else
                m_Worksheet = GetWorksheet(worksheetName);
 
            SetWorksheetAttributes();
        }
 
        // Change de ligne
        public void NewLine()
        {
            if (m_StreamEnded)
                throw new EndOfStreamException();
            if (m_RowIndex < m_RowCount)
            {
                m_RowIndex++;
                m_ColumnIndex = 1;
            }
            else
                m_StreamEnded = true;
 
        }
 
        // Ecrit la valeur donnée dans la cellule courante et avance d'une cellule 
        // ou change de ligne s'il arrive à la fin d'une ligne.
        public void Write(object value)
        {
            if (m_StreamEnded)
                throw new EndOfStreamException();
            object cells = LateBindings.Get(m_Worksheet, "Cells");
            object range = LateBindings.Get(cells, "Item", new object[2] { m_RowIndex, m_ColumnIndex });
            if (value is String)
                LateBindings.Set(range, "NumberFormat", "@");
            LateBindings.Set(range, "Value2", value);
            if (m_ColumnIndex == m_ColumnCount)
            {
                if (m_RowIndex < m_RowCount)
                {
                    m_RowIndex++;
                    m_ColumnIndex = 1;
                }
                else
                    m_StreamEnded = true;
            }
            else
                m_ColumnIndex++;
        }
 
        // Ecrit un ensemble de valeurs donné sous forme de tableau dans des cellules,
        // puis change de ligne à la fin.
        public void WriteLine(object[] values)
        {
            if (m_StreamEnded)
                throw new EndOfStreamException();
            foreach (object val in values)
            {
                if (m_ColumnIndex <= m_ColumnCount)
                {
                    object range = LateBindings.Get(m_Worksheet, "Cells");
                    object cell = LateBindings.Get(range, "Item", new object[2] { m_RowIndex, m_ColumnIndex });
                    if (val is String)
                        LateBindings.Set(cell, "NumberFormat", "@");
                    LateBindings.Set(cell, "Value2", val);
                    if (m_ColumnIndex < m_ColumnCount)
                        m_ColumnIndex++;
                }
            }
            if (m_RowIndex < m_RowCount)
            {
                m_RowIndex++;
                m_ColumnIndex = 1;
            }
        }
 
        // Colle le contenu du presse papier dans la feuille courante
        public void PasteFromClipboard()
        {
            object cells = LateBindings.Get(m_Worksheet, "Cells", new object[2] { 1, 1 });
            LateBindings.Invoke(m_Worksheet, "Paste", new object[2] { cells, false });
        }
 
        // Met à jour les nombres de lignes et de colonnes et la position du lecteur.
        private void SetWorksheetAttributes()
        {
            m_RowIndex = 1;
            m_ColumnIndex = 1;
            object rows = LateBindings.Get(m_Worksheet, "Rows");
            m_RowCount = (int)LateBindings.Get(rows, "Count");
            object cols = LateBindings.Get(m_Worksheet, "Columns");
            m_ColumnCount = (int)LateBindings.Get(cols, "Count");
        }
 
        // Retourne l'instance de la feuille donnée en paramètre, l'ajoute si elle n'existe pas.
        private object GetWorksheet(string worksheetName)
        {
            object worksheets = LateBindings.Get(m_Workbook, "Worksheets");
            try
            {
                return LateBindings.Get(worksheets, "Item", worksheetName);
            }
            catch
            {
                object ws = LateBindings.Invoke(worksheets, "Add", _mis);
                LateBindings.Set(ws, "Name", worksheetName);
                return ws;
            }
        }
    }
}

Cordialement