Question

I know how to pass an object from parent-form to sub-form using constructors.

For example in the parent form, I do this:

WithdrawDialog dlg = new WithdrawDialog(cust.Accounts);

Child form:

public WithdrawDialog(BankAccountCollection accounts)
{
    InitializeComponent();
    PopulateComboBox(accounts);
}

// populate comboBox with accounts
private void PopulateComboBox(BankAccountCollection accounts)
{
    foreach (BankAccount b in accounts)
    {
        comboBoxAccount.Items.Add(b);
    }
}

I’m still trying to get the hang of Properties… How would I use properties instead of overloaded constructors to do this?

Answer 1

Here you go:

WithdrawDialog dlg = new WithdrawDialog();
dlg.accounts = cust.Accounts;
dlg.Show();

public WithdrawDialog()
{
    InitializeComponent();
}

private BankAccountCollection m_Accounts;
public BankAccountCollection accounts {
   get {
      return m_Accounts;
   }
   set {
      m_Accounts = value;
      PopulateComboBox(m_Accounts);
   }
}

// populate comboBox with accounts
private void PopulateComboBox(BankAccountCollection accounts)
{
    foreach (BankAccount b in accounts)
    {
        comboBoxAccount.Items.Add(b);
    }
}

Alternatively, PopupComboBox could be rewritten to use the accounts property:

// populate comboBox with accounts
private void PopulateComboBox()
{
    foreach (BankAccount b in this.accounts)
    {
        comboBoxAccount.Items.Add(b);
    }
}