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Preventing the group from being collapsed.

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123233 Feb 28,2016 10:03 AM UTC Feb 29,2016 03:54 AM UTC WPF 1
Tags: SfDataGrid
Asked On February 28, 2016 10:03 AM UTC


I have a requirement where some of the group should not be collapsible, so I have added the below code on OnGroupCollapsed method where I am checking if the group is "Component #1" then we are setting the group.IsExpand=True.

private void SfDataGrid_OnGroupCollapsed(object sender, GroupChangedEventArgs e)


if (e.Group.Key.Equals("Component #1"))


e.Group.IsExpanded = true;



With this above code what we are noticing is that for the group "Component #1" when user clicks on collapse the group does not collapse [As needed] but what i also notice is that some of the rows down below are getting removed and we are getting an ArgumentOutofRangeException.

Can you please let me know why we are getting this exception when we are not deleting any row here. Attached is the sample application.


Attachment: SampleGrid_774f2988.7z

Sivakumar R [Syncfusion]
Replied On February 29, 2016 03:54 AM UTC

Hi Pruthvi,

You can achieve your requirement by handling GroupCollapsing event instead of GroupCollapsed event.

this.datagrid.GroupCollapsing += Datagrid_GroupCollapsing;

private void Datagrid_GroupCollapsing(object sender, GroupChangingEventArgs e)


    if (e.Group.Key.Equals("Component #1"))


        e.Cancel = true;




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