Control is updated but no event is triggered

Question

I've got a DataGridView which references objects on the application graph. For some reason, the cells are not updated when I add a curve on the graph via drag and drop. When I hover the cell of the data DataGridView some mysterious piece of code is executed. I put a breakpoint at each event triggered by the DataGridView but I was not able to find anything. If I debug step by step, the callstack says External code. Here are the events I follow:

private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
private void dataGridView1_RowsRemoved(object sender, DataGridViewRowsRemovedEventArgs e)
private void dataGridView1_SelectionChanged(object sender, EventArgs e)
private void dataGridView1_DataError(object sender, DataGridViewDataErrorEventArgs e)
private void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
private void dataGridView1_RowContextMenuStripNeeded(object sender, DataGridViewRowContextMenuStripNeededEventArgs e)
private void dataGridView1_MouseDown(object sender, MouseEventArgs e)

The DataSource is set, could this be the culprit ?

How can I investigate more ?

possible duplicate of [drag and drop cell from datagridview to another](http://stackoverflow.com/questions/21131157/drag-and-drop-cell-from-datagridview-to-another) — t3chb0t, Dec 15 '14 at 11:39
@t3chb0t no no, that's not what I want to do, I'll try to reformulate — Thomas Ayoub, Dec 15 '14 at 11:51
What is the type of the object you set as the DataSource of the DataGridView? — Junaith, Dec 15 '14 at 13:25
What is the type of the BindingList element? Does it implement INotifyPropertyChanged properly? — Junaith, Dec 15 '14 at 13:30
@Junaith It's a custom type and it doesn't implement `INotifyPropertyChanged` (or I didn't search enough) — Thomas Ayoub, Dec 15 '14 at 13:32

score 1 · Accepted Answer · answered Dec 15 '14 at 13:42

The BindingList element type has to implement INotifyPropertyChanged interface for the ListChanged event to fire which in turn updates the DataGridView.

From MSDN: ListChanged notifications for item value changes are only raised if the list item type implements the INotifyPropertyChanged interface.

Implement the INotifyPropertyChanged interface in your custom type.

Control is updated but no event is triggered

1 Answers1