Question

I want to populate a listbox after inputting text into a text box and clicking Submit. Seems simple I know, but I’m new to Data Binding and WPF…

Here’s my code so far… I don’t know if the XAML is correct, and of course I have nothing in the event code behind… any help would be appreciated.

XAML:

<ListBox ItemsSource="{Binding ElementName=accountaddTextBox, Path=SelectedItem.Content, Mode=OneWay, UpdateSourceTrigger=Explicit}"  Height="164" HorizontalAlignment="Left" Margin="12" Name="accountListBox" VerticalAlignment="Top" Width="161" />

Code behind:

private void okBtn_Click(object sender, RoutedEventArgs e)
        {

        }

Answer 1

Your current binding is telling the ListBox to find an object named accountaddTextBox, and bind to its SelectedItem.Content. I am assuming that accountaddTextBox is a TextBox, and SelectedItem is not a valid property on TextBox, so your binding is invalid.

It would be far better to bind your ListBox to an ObservableCollection<string> that is located in your code-behind or ViewModel, and have your button add a new object to that collection. Since it is an ObservableCollection, the UI will automatically update

For example,

<ListBox ItemsSource="{Binding SomeObservableCollection}" />

private void okBtn_Click(object sender, RoutedEventArgs e)
{
    SomeObservableCollection.Add(accountaddTextBox.Text);
}