Question

I have a window with a textbox and a submit button. When pressing the submit button, the data in the textbox should populate into the listbox and be saved.

What’s the best way of doing this? I tried a recommendation (using ObservableCollection) from an earlier question I had, but I can’t seem to get it work. I have tried implementing it like this:

I created a class:

public class AccountCollection
{
    private string accountName;
    public string AccountName
    {
        get { return accountName; }
        set { accountName = value; }
    }
    public AccountCollection(string accountName)
    {
        AccountName = accountName;
    }
}        

Assigned the binding in my XAML:

<ListBox ItemsSource="{Binding AccountName, Mode=TwoWay}" IsSynchronizedWithCurrentItem="True" Height="164" HorizontalAlignment="Left" Margin="12" Name="accountListBox" VerticalAlignment="Top" Width="161" SelectionChanged="accountListBox_SelectionChanged" />

…and finally, when a user clicks the submit button from another window that contains the Submit button and textbox:

private void okBtn_Click(object sender, RoutedEventArgs e)
{
    BindingExpression expression = okBtn.GetBindingExpression(accountaddTextBox.Text);
    expression.UpdateSource();
}

But alas, I’m getting nowhere. I get an error message at the GetBindingExpression section:

Argument 1: cannot convert from ‘string’ to ‘System.Windows.DependencyProperty’

What’s obvious to me here is that when I created the class I didn’t specify anything about the account name from the textbox, so I don’t even know if the class is correct.

I’m basically confused and don’t know what to do. Any help would be appreciated…

Answer 1

MODEL

// the model is the basic design of an object containing properties
// and methods of that object. This is an account object.

public class Account : INotifyPropertyChanged
{
    private string m_AccountName;

    public event PropertyChangedEventHandler PropertyChanged;

    public string AccountName
    {
       get { return m_AccountName;}
       set 
         { 
            m_AccountName = value;
            OnPropertyChanged("AccountName");
         }
    }

    protected void OnPropertyChanged(string name)
    {
      PropertyChangedEventHandler handler = PropertyChanged;
      if (handler != null)
      {
          handler(this, new PropertyChangedEventArgs(name));
      }
    }
}

ListBox XAML

 <ListBox Name="MyAccounts" DisplayMemberPath="AccountName" />

CODE BEHIND

// create a collection of accounts, then whenever the button is clicked,
//create a new account object and add to the collection.

public partial class Window1 : Window
{
    private ObservableCollection<Account> AccountList = new ObservableCollection<Account>();

    public Window1()
    {
        InitializeComponent();
        AccountList.Add(new Account{ AccountName = "My Account" });
        this.MyAccounts.ItemsSource = AccountList;
    }
     private void okBtn_Click(object sender, RoutedEventArgs e)
    {
       AccountList.Add(new Account{ AccountName = accountaddTextBox.Text});
    }
}

edit: added displaymemberpath on listbox xaml