Randy Randy - 1 year ago 124
C# Question

Why do I need to change the Binding Source Position before I can SaveChanges

I have a small demo WinForms app. One of the Forms is my Add New Person form. I used the Details View instead of the

from my Data Sources. When I enter data and click the save button on the Navigator there are zero changes, However I put a
and a
after my
in the form
, everything works as expected.

public partial class AddPersonForm : Form
private readonly DemoContext _context;

public AddPersonForm()
_context = new DemoContext();

protected override void OnLoad(EventArgs e)

personBindingSource.DataSource = _context.People.Local.ToBindingList();



private void personBindingNavigatorSaveItem_Click(object sender, EventArgs e)
int changes = _context.SaveChanges();
Debug.WriteLine("# of changes: " + changes);

Why do I need to toggle the BindingSource Position before it will recognize changes and save?

Answer Source

You don't need to change the position, in fact you need to call BindingSource.EndEdit that applies pending changes to the underlying data source.

Changing the position causes the underlying currency manager calls EndCurrentEdit and this is what the EndEdit method of binding source does for you.

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