[Débutant] Passer des contrôles générés par code dans une autre méthode

Voici la solution qu'on m'a suggérée et que j'ai retenue :

Ajouter un tag dans la première fonction :

Code:

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            // The first name
            clbl_AuthorName.Text = "Prénom de l'Auteur :";
            clbl_AuthorName.AutoSize = false;
            clbl_AuthorName.Height = 20;
            clbl_AuthorName.Width = 100;
            // We put a tag on ctb_AthorName so that we can look it up later on
            ctb_AuthorName.Tag = "txtFirstName";
            // And we add it all to the FlowLayoutPanel
            flp_AddNewThings.Controls.Add(clbl_AuthorName);
            flp_AddNewThings.Controls.Add(ctb_AuthorName);
            flp_AddNewThings.SetFlowBreak(ctb_AuthorName, true);
 
            // the Last Name
            clbl_AuthorLastName.Text = "Nom de l'Auteur";
            clbl_AuthorName.AutoSize = false;
            clbl_AuthorName.Height = 20;
            clbl_AuthorName.Width = 100;
            // Same here, we put a tag for later lookup
            ctb_AuthorLastName.Tag = "txtLastName";
            // And we add all that to the rest
            flp_AddNewThings.Controls.Add(clbl_AuthorLastName);
            flp_AddNewThings.Controls.Add(ctb_AuthorLastName);
            flp_AddNewThings.SetFlowBreak(ctb_AuthorLastName, true);

Code:

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        private void cbtn_CreateNewAuthor_Click(object sender, EventArgs e)
        {
            using (var db = new ProgramContext())
            {
                // First we create a list of the flow layout panel controls and add the controls to it
                List<Control> AllControls = new List<Control>();
                foreach (Control c in flp_AddNewThings.Controls)
                {
                    AllControls.Add(c);
                }
 
                // Then we take the controls we need
                var txtFirstName = AllControls.SingleOrDefault(x => x.Tag == "txtFirstName");
                var txtLastName = AllControls.SingleOrDefault(x => x.Tag == "txtLastName");
 
                // if the two above arent null, we go on :
                var author = new Author();
                if (txtFirstName != null && txtLastName != null)
                {
                    // We make sure there's actually a name and last name entered
                    if (txtFirstName.Text == "" && txtLastName.Text == "")
                    {
                        author.FirstName = txtFirstName.Text;
                        author.LastName = txtLastName.Text;
                    }
                    else // else we make the person aware it's needed
                    {
                        if (txtFirstName.Text == "") flp_AddNewThings.Controls.Add(new Label{ Text = "Vous devez ajouter un Prénom"});
                        if (txtLastName.Text == "") flp_AddNewThings.Controls.Add(new Label { Text = "Vous devez ajouter un Nom de Famille" });
                    }
 
                    // we verify if it's not already in the db:
 
                    var AutorOk = db.Authors.Any(x => x.LastName == author.LastName && x.FirstName == author.FirstName);
                    if (AutorOk)
                    {
                        db.Authors.Add(author);
                        db.SaveChanges();
 
                        // Display all Authors from the database 
                        var query = from b in db.Authors
                                    orderby b.DisplayName
                                    select b;
 
                        LogBox.Text = "Auteurs Connus : \n";
                        foreach (var item in query)
                        {
                            LogBox.AppendText(item.DisplayName + "\n");
                        }
                    }
 
                }
            }
 
        }