Xamarin - UITableView reload data for array - ios

Question

I implemented UITableView on Xamarin using a new class for TableSource. I am initializing TableSource from MainView and pass an array. Then I am trying to update that array from MainView and I am getting error:
Object reference not sent to an instance
The code in MainVC:
public override void ViewDidLoad()
{
base.ViewDidLoad();
// Perform any additional setup after loading the view, typically from a nib.
//Console.WriteLine("Event 1");
lVM = new ListViewModel();
lVM.dataUpdated += this.updateArray;
lVM.dataUpdatedNetwork += this.networkUpdatedSQL;
lVM.getInitialData(100);
tableSource = new ListTableSource(this);
tableV.Source = tableSource;
}
public void updateArray(object sender, EventArgs e) {
InvokeOnMainThread(delegate
{
//Console.WriteLine("Update array event on VC for SQL count for array " + lVM.ordersArray.Count);
tableSource.updateArray(lVM.ordersArray);
tableV.ReloadData();
});
}
The code in TableSource:
public class ListTableSource : UITableViewSource
{
ListViewController listVCRef;
ArrayList tableItems;
string cellIdentifier = "TableCell";
public ListTableSource(ListViewController listVC)
{
tableItems = new ArrayList();
listVCRef = listVC;
}
public void updateArray(ArrayList items) {
tableItems = new ArrayList(items);
Console.WriteLine("Items " + tableItems.Count);
}
public override void RowSelected(UITableView tableView, NSIndexPath indexPath)
{
new UIAlertView("Alert", "You touched: " + tableItems[indexPath.Row], null, "OK", null).Show();
tableView.DeselectRow(indexPath, true);
}
public override UITableViewCell GetCell(UITableView tableView, NSIndexPath indexPath)
{
UITableViewCell cell = tableView.DequeueReusableCell(cellIdentifier);
if (cell == null)
{
cell = new UITableViewCell(UITableViewCellStyle.Subtitle, cellIdentifier);
}
Order currentOrder = tableItems[indexPath.Row] as Order;
cell.TextLabel.Text = currentOrder.comment;
cell.DetailTextLabel.Text = currentOrder.orderDate.ToString();
return cell;
}
public override nint RowsInSection(UITableView tableview, nint section)
{
return tableItems.Count;
}
public override nfloat GetHeightForRow(UITableView tableView, NSIndexPath indexPath)
{
return 80;
}
}
Is my approach wrong? How I am supposed to update the data in TableSource.

Answer 1

My feeling is that updateArray is executed before tableSource = new ListTableSource(this); and because of this tableSource is null. lVM.getInitialData(100); is likely triggering updateArray.

Answer 2

This worker for my:
button.TouchUpInside += (s, e) => {
tableItems.Add(textfield1.Text); //(1)
table = new UITableView(View.Bounds);
table.Source = new TableView(tableItems.ToArray()); //(2)
table.Frame = new CoreGraphics.CGRect(0, 350, this.View.Frame.Width, 300); //(3)
Add(table);
};
in (1) the list tableItems add new value of uiTextField
in (2) Actually the datas in Source of your table
in (3) create visually the table