Datagrid - DataGridGroupRow - control over expand / collapse

Datagrid - DataGridGroupRow - control over expand / collapse

Posted by: appmod on 7 August 2017, 5:11 pm EST

• 

  appmod

  • Post Options:
  • Link
    Copy
  • Jump To Answer

  Posted 7 August 2017, 5:11 pm EST

  I have a datagrid with itemsource bound to an observable collection.
  
  If the user uses the grouping feature, and collapses 1 (or more) groups…
  
  But in the background (on timer) we have newer records arriving in to our collection…
  
  The datagrid will always refresh with all groups expanded.

  I need a way to remember which group values are collapsed, and after each refresh (to itemsource) I can re-collapse the correct entries (assuming they still exist of course).

  This person also had a similar question:
  
  http://our.componentone.com/groups/silverlight/studio-for-silverlight/forum/topic/datagrid-refresh-data

  Any tips/ suggestions (or can it be done)?
  
  Thanks in advance.
  
  -michael

• 

  c1upkar_s

  • Post Options:
  • Link
    Copy

  Posted 7 August 2017, 5:11 pm EST

  I think you can save the ‘GroupRowsVisibility’ values using a dictionary and apply those values later on after the refresh. So, try something like this to save the GroupRowsVisibility values:-

  [csharp] Dictionary<int, Visibility> rowvisibilityvalues = new Dictionary<int, Visibility>();

  foreach (var row in grid.Rows)
  
  {
  
  if (row.Type == DataGridRowType.Group)
  
  {
  
  rowvisibilityvalues[row.Index] = (row as DataGridGroupRow).GroupRowsVisibility;
  
  }
  
  }[/csharp]

  You can manually apply the values like this:-

  [csharp]foreach (var row in GridA.Rows)
  
  {
  
  if (row.Type == DataGridRowType.Group)
  
  {
  
  (row as DataGridGroupRow).GroupRowsVisibility = rowvisibilityvalues[row.Index] ;
  
  }
  
  }[/csharp]

  Let me know if you face any further issues/questions.

  Thanks

• 

  jpsilver

  • Post Options:
  • Link
    Copy

  Posted 7 August 2017, 5:11 pm EST

  Wondering if this is still the only way to keep groups from auto-expanding after a refresh.

  If so, are there recommended Grid events to perform this manual saving / retrieving of grid settings?

  Thanks.

• 

  c1upkar_s

  • Post Options:
  • Link
    Copy

  Posted 7 August 2017, 5:11 pm EST

  How is the refresh occurring in your case? Is it a change in the bound ItemsSource or what?
  
  If you are changing the itemssource manually, you can update the ItemsSource between the above methods.

  Regards

• 

  abellisomi

  • Post Options:
  • Link
    Copy

  Posted 20 January 2020, 1:06 pm EST

  C1upkar_s, this does not seem to work. If I read the property

  GroupRowsVisibility

  I always get

  Visible

  , regardless of the situation for the group, expanded or collapsed doesn’t matter.

  Any idea?

  Thanks,

  A.

• 

  Ruchir.Agarwal

  

  • Post Options:
  • Link
    Copy

  Posted 21 January 2020, 7:30 am EST

  Hi,

  I have prepared for you a solution that stores the expand/collapse state of grouped rows in C1DataGrid. For details, please refer the attached application.

  Hopefully this should help.

  Regards,
  
  Ruchir
  
  StoreGroupInfo_C1DataGrid.zip