ListBox n'affiche aucun résultat

Question

J'essaie d'ajouter un tableau de chaînes qui contient des informations sur les personnes à un ListBox mais je ne peux pas le faire pour montrer quelque chose et je ne sais vraiment pas pourquoi.

Il s'agit de la première classe appelée lorsque le bouton permettant d'ajouter des contacts à la liste est cliqué.

public partial class MainForm : Form 
{ 
    private ContactManager m_contacts; 

    public MainForm() 
    { 
     InitializeComponent(); 

     m_contacts = new ContactManager(); 
     InitializeGUI(); 
    } 

    private void InitializeGUI() 
    { 
     txtFirstName.Text = string.Empty; 
     txtLastName.Text = string.Empty; 
     txtStreet.Text = string.Empty; 
     txtCity.Text = string.Empty; 
     txtZipCode.Text = string.Empty; 

     cmbCountry.Items.AddRange(Enum.GetNames(typeof(Countries))); 
     cmbCountry.DropDownStyle = ComboBoxStyle.DropDownList; 
     cmbCountry.SelectedIndex = (int)Countries.Sverige; 

     UpdateGUI(); 
    } 

    private bool ReadInput(out Contact contact) 
    { 
     // skapar ett lokalt objekt av Contact-klassen 
     contact = new Contact(); 

     // Lägger in ReadAdress till ett objekt i klassen Adress. 
     Address adr = ReadAddress(); 

     contact.AddressData = adr; // skickar adress till contact-objekt 


     //bool readNameOK = ReadName(); 


     // ReadName är OK så skickas det till AddContact. 
     if (ReadName()) 
     { 
      m_contacts.AddContact(contact); 

     } 
     return ReadName(); 

    } // ReadInput 

    private bool ReadName() 
    { 
     Contact contact = new Contact(); 
     contact.FirstName = txtFirstName.Text; 
     contact.LastName = txtLastName.Text; 

     bool firstname = false; 
     bool lastname = false; 

     if (!InputUtility.ValidateString(contact.FirstName)) 
     { 
      MessageBox.Show("You must enter a first name with atleast one character (not a blank)", "Error!", 
       MessageBoxButtons.OK, MessageBoxIcon.Error); 

      txtFirstName.Focus(); 
      txtFirstName.Text = " "; 
      txtFirstName.SelectAll(); 

      firstname = false; 
     } 
     else if (!InputUtility.ValidateString(contact.LastName)) 
     { 
      MessageBox.Show("You must enter a last name with atleast one character (not a blank)", "Error!", 
       MessageBoxButtons.OK, MessageBoxIcon.Error); 

      txtLastName.Focus(); 
      txtLastName.Text = " "; 
      txtLastName.SelectAll(); 

      lastname = false; 
     } 


     return firstname && lastname; 
    } 

    private Address ReadAddress() 
    { 
     Address address = new Address(); 

     address.Street = txtStreet.Text; 
     address.City = txtCity.Text; 
     address.ZipCode = txtZipCode.Text; 
     address.Country = (Countries)cmbCountry.SelectedIndex; 

     return address; 
    } 

    private void button1_Click(object sender, EventArgs e) 
    { 
     Contact contact; 
     if (ReadInput(out contact)) 
     {     
      UpdateGUI(); 
     } 
    } 

    private void UpdateGUI() 
    { 
     lstContacts.Items.Clear(); 
     lstContacts.Items.AddRange(m_contacts.GetContactsInfo()); 
     lblCount.Text = m_contacts.Count().ToString(); 
    } 

    private void lstContacts_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     UpdateContactInfoFromRegistry(); 
    } 

    private void UpdateContactInfoFromRegistry() 
    { 
     Contact contact = m_contacts.GetContact(lstContacts.SelectedIndex); 

     cmbCountry.SelectedIndex = (int)contact.AddressData.Country; 
     txtFirstName.Text = contact.FirstName; 
     txtLastName.Text = contact.LastName; 
     txtCity.Text = contact.AddressData.City; 
     txtStreet.Text = contact.AddressData.Street; 
     txtZipCode.Text = contact.AddressData.ZipCode; 
    } 



} 

Cette classe appelle alors cette classe

public class ContactManager 
{ 
    private List<Contact> m_contactRegistry; 

    public ContactManager() 
    { 
     m_contactRegistry = new List<Contact>(); 
    } 

    public int Count() 
    { 
     int count = m_contactRegistry.Count(); 

     return count; 
    } 

    public bool CheckIndex(int index) 
    { 
     if (index >= 0 && index < m_contactRegistry.Count()) 
      return true; 

     else return false; 
    } 
    public bool AddContact(string firstName, string lastName, Address addressIn) 
    { 
     Contact contactObj = new Contact(); 
     bool result = false; 

     if (!result) 
     { 
      contactObj.FirstName = firstName; 
      contactObj.LastName = lastName; 
      contactObj.AddressData = addressIn; 

      m_contactRegistry.Add(contactObj); 
      result = true; 
     } 
     return result; 
    } 

    public bool AddContact(Contact contactIn) 
    { 
     if (contactIn == null) 
     { 
      return false; 
     } 
     else 
     { 
      m_contactRegistry.Add(contactIn); 
      return true; 
     } 

    } 

    public bool changeContact(Contact contactIn, int index) 
    { 
     if (CheckIndex(index)) 
     { 
      Contact contact = (Contact)m_contactRegistry[index]; 
      //contact.ToString = contactIn; 
      return true; 
     } 
     else return false; 
    } 

    public bool DeleteContact(int index) 
    { 
     if (CheckIndex(index)) 
     { 
      m_contactRegistry.RemoveAt(index); 
      return true; 
     } 
     else return false; 
    } 

    public Contact GetContact(int index) 
    { 
     if (!CheckIndex(index)) 
      return null; 

     else return m_contactRegistry[index]; 

    } 

    public string[] GetContactsInfo() 
    { 
     string[] strInfoStrings = new string[m_contactRegistry.Count]; 

     int i = 0; 
     foreach (Contact contactObj in m_contactRegistry) 
     { 
      strInfoStrings[i++] = contactObj.ToString(); 
     } 
     return strInfoStrings; 
    } 
} 

Toute aide concernant pourquoi les tableaux montrent l'habitude dans la zone de liste serait beaucoup appriciated, merci.

Answer 1

Votre ReadName() retourne toujours faux, là car il n'ajoute jamais les contacts.

EDIT: Un code plus clair

private Contact ReadInput() 
{ 
    Contact contact = new Contact(); 
    contact.FirstName = txtFirstName.Text; 
    contact.LastName = txtLastName.Text; 
    contact.AddressData = new Address 
     { 
      Street = txtStreet.Text, 
      City = txtCity.Text, 
      ZipCode = txtZipCode.Text, 
      Country = (Countries) cmbCountry.SelectedIndex 
     }; 
    return contact; 
} 

private bool ValidateContact(Contact contact) 
{ 
    if (!InputUtility.ValidateString(contact.FirstName)) 
    { 
     MessageBox.Show("You must enter a first name with atleast one character (not a blank)", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error); 

     txtFirstName.Focus(); 
     txtFirstName.Text = " "; 
     txtFirstName.SelectAll(); 
     return false; 
    } 
    else if (!InputUtility.ValidateString(contact.LastName)) 
    { 
     MessageBox.Show("You must enter a last name with atleast one character (not a blank)", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error); 

     txtLastName.Focus(); 
     txtLastName.Text = " "; 
     txtLastName.SelectAll(); 
     return false; 
    } 
    return true; 
} 

private void button1_Click(object sender, EventArgs e) 
{ 
    Contact contact = ReadInput(); 
    if (ValidateContact(contact)) 
    { 
     m_contacts.AddContact(contact); 
     UpdateGUI(); 
    } 
}