Items.Add cannot be used because it is not the "DataSource" C# WindowsForm-CodePudding

I am trying to add an item to aircraftList ListBox and be able to click on it and on a detailsList TextBox display all information per item selected. However, I am using BindingList<AircraftDetails> Details = new BindingList<AircraftDetails>(); and AircraftClass which contains the following method:

public override string ToString()
    {
        List<string> builder = new List<string>();
        builder.add("something here like a variable");

which wil return all details to the detailsList textBox.

Now, the issue is that when I tried to do something like aircraftList.Items.Add("Test") it will show a error message showing this

I am at a loss for what to do, however I will provide the repository of my code that is hosted on gitHub so that you can better comprehend it. REPOSITORY

CodePudding user response：

The error message tells you exactly what the issue is. You cannot modify the Items collection when you have set the DataSource property. The whole point of binding a list to the control is that the control displays what's in that list. If you want to add a new item, you have to add it to the list you bound to the control.

CodePudding user response：

Thank you for posting your repository in support of your question. That made it easy to reproduce the issue. I made a minor change to your addaircraftButton_Click that "should" do the trick.

public void addaircraftButton_Click(object sender, EventArgs e)
{
    //FlightSetup is a form which will fill out the Main's Form Variables
    //Trying to add "planeModel" to aircraftList and display details once it is selected from the list
    FlightSetup addplane = new FlightSetup();
    AircraftDetails aircraftDetails = new AircraftDetails();
    using (addplane)
    {
        DialogResult result = addplane.ShowDialog();

        planeModel = addplane.planeModel_textbox.Text;
        airline = addplane.airline_textbox.Text;
        fuelG = double.Parse(addplane.fuel_textbox.Text); //TESTING (Look at BuildLogs.txt for complete code before this one)
        bag1 = int.Parse(addplane.carryonTextBox.Text);
        bag2 = int.Parse(addplane.checkedBagsTextBox.Text);

        object o = new AircraftDetails
        {
            AircraftModel = planeModel,
            Airline = airline,
            Fuel = fuelG, //TESTING
            OnBoardBags = bag1,
            CheckedBags = bag2,
        };
        detailsList.Text = o.ToString();
    }

    //aircraftList.Items.Add(planeModel); // not working right here <--

    // Do this instead!
    Details.Add(aircraftDetails);
}

Obviously, you were very close to having the right code yourself. The thing to remember is that once you bind to a DataSource, you should be able to work directly with that data (in this case Details.Add(aircraftDetails)) and should no longer attempt to manipulate the UI control directly.