BuildSortString exception

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

JohnC - 18 Oct 2005 21:34 GMT

I am using the SortableBindingList<T> class described in the MSDN Custom Data
Binding article at
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnforms/html/wi
nforms11162004.asp?frame=true

This business object is displayed in a listbox using databinding via a
BindingSource oject. When I set the Sort property on my BindingSource object
and then modify the underlying data I get an exception from the
BindingSource's BuildSortString. This same exception was documented on the
microsoft forums at
http://forums.microsoft.com/msdn/ShowPost.aspx?PostID=76499 without a
resolution. Is this a bug in .NET 2.0 or is there some other problem?

Thanks,
John

Reply to this Message

Bart Mermuys - 19 Oct 2005 00:42 GMT

Hi,

>I am using the SortableBindingList<T> class described in the MSDN Custom
>Data
[quoted text clipped - 9 lines]
> http://forums.microsoft.com/msdn/ShowPost.aspx?PostID=76499 without a
> resolution. Is this a bug in .NET 2.0 or is there some other problem?

I think it is caused by some missing overrides in SortableBindingList<T> :

* Add two fields:
private PropertyDescriptor _sortProp = null;
private ListSortDirection _sortDir = ListSortDirection.Ascending;

* Add code inside ApplySortCore:
after "_isSorted=true" put :
_sortProp = property
_sortDir = direction

after "_isSorted=false" put:
_sortProp = null

* Add two more overrides:
protected override PropertyDescriptor SortPropertyCore
{
get { return _sortProp; }
}

protected override ListSortDirection SortDirectionCore
{
get { return _sortDir; }
}

HTH,
Greetings

> Thanks,
> John

Reply to this Message

JohnC - 19 Oct 2005 01:34 GMT

That was it, thanks!

> Hi,
>
[quoted text clipped - 42 lines]
> > Thanks,
> > John

Reply to this Message

BuildSortString exception

Free Magazines