Hello,
I have problem with performance of GridView in self referencing hierarchy mode. I am working on move up/down function to move specific row up or down. I need to move it also in my underlying list, so I move it first in my list and then clear BindingList for GridView and add new items. This is done in DoRefreshEditorItems method of TestParEditorCollection class:
private void DoRefreshEditorItems()
{
EditorItems.Clear();
maxGridId = 0;
foreach (var item in Items)
{
var editorItem = new TestParEditorItem(item, ++maxGridId);
EditorItems.Add(editorItem);
if (item.HasSubItems)
AttachSubItems(editorItem);
}
RenumberRows();
}Each call to EditorItems.Add() takes cca 100ms and whole refresh of 20 rows takes cca 2s. It looks like this:
I also tried to set DataSource to null, refresh binding list and set DataSource back, but it looks very similar. I have attached test project, it's TelerikTestReal project in solution.
1 Answer, 1 is accepted
Hello Marian,
I appreciate the provided details.
Each operation executed on the bound collection will be reflected in the UI. What you can do is suspend the UI updates by using the Begin/EndUpdate() methods of the control. You can wrap the logic between these two methods.
private void tsEditUp_Click(object sender, EventArgs e)
{
this.radGridView1.BeginUpdate();
.... custom logic
this.radGridView1.EndUpdate();
}private void tsEditDown_Click(object sender, EventArgs e)
{
this.radGridView1.BeginUpdate();
. . . . custom logic
this.radGridView1.EndUpdate();
}This way the row re-position will be faster.
Regards,
Dinko | Tech Support Engineer
Progress Telerik
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Hello,
thanks, yes, it's faster. So is it generally expected to wrap each data update between BeginUpdate/EndUpdate? Because it's seems to be very slow for me, to take 100ms for each added row? What if I will have 100k rows, not only 20?
