Setting DataSource to an ArrayList

[Jonathan Jones]

Hi,

I seem to be having a problem setting the DataSource of a GridGroupingControl to an ArrayList. I chose this control because I need the ability to easily sort columns.

The ArrayList is always initially empty. Other controls (not part of the grid) add to and remove from the ArrayList (so I assume I don''t need IBindingList support). If I set the DataSource to the empty ArrayList, the contents of the ArrayList are never correct afterwards. It only shows the last column I have defined (instead of all 3). That one column is always empty in every cell (even though every cell should have data).

If I fudge it to set the DataSource of the grid after the ArrayList has items in it, it works a little better. All columns are present, and the cells seem to have the correct data. However, I still can never see when new items are added to the ArrayList without clicking on the column headers to force the columns to sort again.

I don''t know if this is relevant, but the ArrayList is written in C++, and the GUI code is written in C#. The ArrayList code needs to be in C++, because it is an interface that we expose to our customers, and we can''t assume our customers have knowledge of C#.

Any help is appreciated, as I am very stuck.

Thanks,
- Jonathan

[Administrator]

I think you can get things to work if you have your arraylist implement ITypedList. Here is a little sample that starts with an empty list, and adds 2 items at a time in button click.

http://www.syncfusion.com/Support/user/uploads/GGC_ArrayList_63f8e2e2.zip

Whovever changes your arraylist will have to tell teh grid thatthe dat is dirty. Or, you can have a derived arraylist raise an event anytime a member is changed/added/deleted (essentially the IBindingList.ListChanged event). The you can have teh grid listen for your custom event, and have it set itself dirty.

[Jonathan Jones]

Hi Clay,

Thank you so much! This has solved my problem.

In retrospect, this makes sense, but I am fairly new to .NET and very new to Syncfusion, so I simply didn''t know how to proceed.

Also, I am using the ArrayListExt to store the data, and having the CollectionChangeEventHandler call grid.Reinitialize() to update the GridGroupingControl. Is this correct?

Thanks,
- Jon