DataGridView: databinding to BindingList<T> should get bound values from T #946

Tiago (ITG) asked 2017-07-19 15:53:39 UTC

Hi Wisej people,

I have this DataGridView that is bound to a BindingSource

this.dataGridView.DataSource = this.employeeListBindingSource;

The DataSource of this BindingSource is a BindingList

this.employeeListBindingSource.DataSource = typeof(BusinessObjects.EmployeeList);

public class EmployeeList : BindingList {}

The attached sample includes a common business class and 2 UI projects, for Windows Forms and for Wisej.

I have an object numbering system that works correctly on Windows Forms (and WPF and whatever) but fails under Wisej.

The Windows Forms DGV instantiates a new Employee every time I move to  a different (new) row. This means it tries to get bound values from the new BO. Of course it sets user entered values on the BO without any issue.

The Wisej DGV only instantiates a new Employee whenever I quit the (old) row. So it doesn't try to get bound values for the new row but only tries to set user entered values on the BO.

I don't think one should use DefaultValuesNeeded when using data binding.

Please help. Is there some option I should use or is it a plain old bug?