private void AddNewStringItem_Click(object sender, RoutedEventArgs e)
{
if (string.IsNullOrWhiteSpace(NewStringItem))
{
return;
}
if (StringItems?.Contains(NewStringItem) ?? false)
{
MessageBox.Show($"Item: {NewStringItem} already exists",
"Warning",
MessageBoxButton.OK,
MessageBoxImage.Warning);
return;
}
if (StringItems == null)
{
StringItems = new ObservableCollection <string>();
}
StringItems.Add(NewStringItem);
if (AvailableStringItems?.Contains(NewStringItem) ?? false)
{
AvailableStringItems?.Remove(NewStringItem);
}
NewStringItem = null;
}
