CODEWITHSUNDEEP
c#.netwinforms
Andrzej Czerwoniec
Andrzej Czerwoniec

Reputation: 203

A problems with refreshing DataGridView

I'm using a DataGridView with bounded List of objects in my application. So I have:

grid.DataSource = Files.Instance.List;

in my form load event and than I want to have two buttons - for adding and removing items from the list (so also from the grid), I though it should be as simple as:

if (openFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
    Files.Instance.List.Add(new DelphiFile { FilePath = openFileDialog.FileName });
    grid.Refresh();
}

I'm only setting up the start path here, I wanted the rest parameters to be set by user in the grid view. The item is added correctly but unfortunatelly it doesnt appear on the list, why?

I also have issues with deleting items:

foreach(DataGridViewRow row in grid.SelectedRows)
{
   Files.Instance.List.Remove(row.DataBoundItem as DelphiFile);
}
grid.Refresh();

items are deleted correctly but again the grid doesn't seem to refresh and I'm even getting an exception because the last item in the grid doesn't have a value than :O .

What am I doing wrong?

Upvotes: 0

Views: 65

Answers (1)

King King
King King

Reputation: 63317

I guess you declared Files.Instance.List as of type List<DelphiFile>, so when the collection is changed, the dataGridView doesn't know about that, use BindingList<DelphiFile> instead.

Upvotes: 1

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