Hiding Row in DataGridView Very Slow
- by Ed Schwehm
I have a DataGridView in a Winforms app that has about 1000 rows (unbound) and 50 columns. Hiding a column takes a full 2 seconds. When I want to hide about half the rows, this becomes a problem.
private void ShowRows(string match)
{
this.SuspendLayout();
foreach (DataGridViewRow row in uxMainList.Rows)
{
if (match == row.Cells["thisColumn"].Value.ToString()))
{ row.Visible = false; }
else
{ row.Visible = true; }
}
this.ResumeLayout();
}
I did some testing by adding by addingConsole.WriteLine(DateTime.Now)around the actions, androw.Visible = falseis definitely the slow bit. Am I missing something obvious, like setting IsReallySlow = false? Or do I have to go ahead and enable Virtual Mode and code up the necessary events?
