GroupingGrid : Getting nested tables from an ArrayList of ArrayList

[Roberto Obispo]

Hi, I would like to know how to get a nested table without using DataSets. For example, setting as DataSource an ArrayList of ArrayList... Would it be possible?

[Administrator]

Yes. You can do this. Here is a little sample.

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

[Roberto Obispo]

Thank you very much!
The sample works fine in C#, but I''ve tried to use the same method with my VB.NET project, and It keeps throwing me this exception:

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
at Syncfusion.Grouping.RelationDescriptorCollection.EnsureInitialized(Boolean populate)
at Syncfusion.Grouping.RelationDescriptorCollection.get_Version()
at Syncfusion.Grouping.FieldDescriptorCollection.EnsureInitialized(Boolean populate)
at Syncfusion.Grouping.FieldDescriptorCollection.get_Version()
.......
(the original text is very much larger, as you could imagine)

It ocurrs after setting the grid''s DataSource.
Where could be the problem?

Thanks a lot

[Administrator]

Here is a VB version.

http://www.syncfusion.com/Support/user/uploads/GGC_ArrayLists_VB_c4081367.zip

Depending upon the order of initializing things, the groupinggrid may not have set certain variables. You can force them to be set just by accessing a count or something that triggers the initialzation like:

Dim i as integer = me.grd.TableDescriptor.Columns.Count

This may be the problem you are seeing.