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Setting DataSource to an ArrayList

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30556 Jun 20,2005 03:21 PM UTC Jun 20,2005 08:39 PM UTC WinForms 2
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Tags: GridControl
Jonathan Jones
Asked On June 20, 2005 03:21 PM UTC

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 [Syncfusion]
Replied On June 20, 2005 04:44 PM UTC

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
Replied On June 20, 2005 08:39 PM UTC

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

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