Datagrid - DataGridGroupRow - control over expand / collapse

Datagrid - DataGridGroupRow - control over expand / collapse

Posted by: appmod on 7 August 2017, 8:11 am EST

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  appmod

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  Posted 7 August 2017, 8:11 am 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

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  c1upkar_s

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  Posted 7 August 2017, 8:11 am 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

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  jpsilver

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  Posted 7 August 2017, 8:11 am 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.

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  c1upkar_s

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  Posted 7 August 2017, 8:11 am 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

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  abellisomi

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  Posted 20 January 2020, 4:06 am 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.

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  Ruchir.Agarwal

  

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  Posted 20 January 2020, 10:30 pm 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