Why Doesn't My WinForms DataGridView Update After Adding Items to a List?

Binding BindingList to DataGridView in WinForm

In this WinForm scenario, a class representing a person and a List are utilized, with the intention of binding this list to a DataGridView. The binding is initially successful, displaying two rows corresponding to the items added to the list. However, subsequent additions to the list do not automatically reflect in the DataGridView.

Understanding the Binding

The problem arises from the fact that List does not implement IBindingList. Consequently, the DataGridView is unaware of any changes made to the list.

Solution: BindingList

To resolve this issue, consider binding the DataGridView to a BindingList instead. This class implements IBindingList, allowing the DataGridView to receive notifications of changes in the bound list.

var list = new BindingList<Person>(persons);
myGrid.DataSource = list;

BindingSource for Even More Control

For even greater control over data binding, consider using a BindingSource as an intermediary between the BindingList and the DataGridView.

var list = new List<Person>()
{
    new Person { Name = "Joe", },
    new Person { Name = "Misha", },
};
var bindingList = new BindingList<Person>(list);
var source = new BindingSource(bindingList, null);
grid.DataSource = source;

By employing this approach, you can maintain a consistent and dynamic binding between your data source and the DataGridView, ensuring that updates to the underlying data are reflected in real-time.

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