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How to populate listbox with textbox?

Populate ListBox

  • 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:

    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

Woody at Stack Overflow Visit the source

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Here is a Demo using MVVM approach ViewModel public class AccountListViewModel : INotifyPropertyChanged { ICommand AddAccountCommand {get; set;} public AccountListViewModel() { AccountList = new ObservableCollection<string>(); AddAccountCommand= new RelayCommand(AddAccount); //Fill account List saved data FillAccountList(); } public AddAccount(object obj) { AccountList.Add(AccountName); //Call you Model function To Save you lIst to DB or XML or Where you Like SaveAccountList() } public ObservableCollection<string> AccountList { get {return accountList} ; set { accountList= value OnPropertyChanged("AccountList"); } } public string AccountName { get {return accountName } ; set { accountName = value OnPropertyChanged("AccountName"); } } } Xaml Binding <ListBox ItemsSource="{Binding Path=AccountList}" Height="164" HorizontalAlignment="Left" Margin="12" Name="accountListBox" VerticalAlignment="Top" Width="161" /> <TextBox Text={Binding Path=AccountName}></TextBox> <Button Command={Binding Path=AddAccountCommand}><Button> Xaml.cs Code # region Constructor /// <summary> /// Default Constructor /// </summary> public MainView() { InitializeComponent(); this.DataContext = new AccountListViewModel(); } # endregion The Implementation of INotifyPropertyChanged and forming porpeties is left upto you

adcool2007

Your ItemsSource for your ListBox is AccountName, which is only a string but not a collection. You need to create a viewmodel (your datacontext for the view) like this: public class ViewModel { public ViewModel() { Accounts = new ObservableCollection<string>(); } public ObservableCollection<string> Accounts { get; set; } } Bind ItemsSource to Accounts property: <ListBox ItemsSource="{Binding Accounts}" Height="164" HorizontalAlignment="Left" Margin="12" Name="accountListBox" VerticalAlignment="Top" Width="161" /> And then, in your click event handler of the button you can simple add the current value of the textbox to your collection: private void okBtn_Click(object sender, RoutedEventArgs e) { Accounts.Add(accountaddTextBox.Text); } But don't forget to set the DataContext of your window to the class ViewModel.

Felix C

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