How to change two row by no reset itemsource value

[rui]

I want to change the position  of two rows 

the itemsource is binding to Columns,   item is currentItem,

the code :

int index = Columns.IndexOf(item) - 1;

Columns.Remove(item);
Columns.Insert(index, item);

 

now  i must reset the source  and the UI refresh

Columns = Columns.ToList().OrderBy(t => t.column_order) as ObservableCollection<Column>

 

Is any way  tochange the position by not refresh ui?

[Dilyan Traykov]

Hello Rui,

Provided your Columns collection implements the INotifyCollectionChanged interface, any changes made to it should be reflected in RadGridView. I'm attaching a sample project in which, using the code you provided, I'm successfully able to swap the items and notify RadGridView about it.

Could you please have a look at the attached project and let me know whether I've missed something important? If that is the case, please let me know and I will gladly assist you further.

Regards,
Dilyan Traykov
Telerik by Progress

[rui]

Thanks for your answer

I'm sorry i missed an important  thing  

i group the gridview by ColumnGroupDescriptor

<telerik:RadGridView.GroupDescriptors>
                <telerik:ColumnGroupDescriptor x:Name="columnGroupDescriptor" Column="{Binding Columns[\ContactTitleWithConverter\], ElementName=ESColumnGrid}"  SortDirection="Ascending"/>
</telerik:RadGridView.GroupDescriptors>

in your demo code i change a row cell data as same as another row  and drag the column header to group 

and the issue is also exist

Is there any solution for this

[rui]

I find the solution  use ColumnGroupDescriptor's ResumeNotifications mothed

columnGroupDescriptor.ResumeNotifications();

thank you very much!

[rui]

ResumeNotifications  can  change the two item's index  but  the GridView is scroll to top  

how to let the scrollbar keep the position

[Dilyan Traykov]

Hello,

Could you please let me know how I need to modify the project from my previous post as well as what action steps I should take in order to reproduce the issue you've described as I am currently unable to do so?

Thank you in advance for your cooperation on the matter.

Regards,
Dilyan Traykov
Telerik by Progress