Grid Group By Field with Anonymous Type

[MFitzpatrick]

It seems that as of the Q3 release I am no longer able to add a GridGroupByField in a radgrid when the radgrid's datasource is a list of anonymous type objects.

Here is the group by expressions section in the grid:

<GroupByExpressions>
              <tk:GridGroupByExpression>
                <SelectFields>
                  <tk:GridGroupByField FieldAlias="Sent" FieldName="DateSent" FormatString="{0:D}" HeaderValueSeparator=" on: "></tk:GridGroupByField>
                </SelectFields>
                <GroupByFields>
                  <tk:GridGroupByField FieldName="DateSent" FormatString="{0:D}" SortOrder="Descending" ></tk:GridGroupByField>
                </GroupByFields>
              </tk:GridGroupByExpression>
            </GroupByExpressions>

The following is the anonymous type object declaration from the code behind:

oList.Add(New With {Key .SysID = message.SysID, .From = sender, .Subject = message.EmailSmsLog.Subject, _
                    .MailIcon = emailIcon, .DateSent = dateSent, .TimeSent = timeSent, _
                    .IsRead = message.IsRead})

I then assign the datasource of the radgrid as oList

The exception I get is:
Telerik.Web.UI.ParseException: No property or field 'DateSent' exists in type 'Object'

When I take the group by expressions out of the radgrid, everything works fine.

This code worked in previous versions of the control.

Can anyone confirm that this is a problem in Q3.

Thanks

Mike

[Radoslav]

Hello Mfitzpatrick,

Could you please try creating the List of anonymous types directly instead of boxing the anonymous types into the list of objects. For example:

Public Function CreateEmptyList(Of T)(ByVal unused As T) As List(Of T)
    Return New List(Of T)()
  End Function

  Dim list = CreateEmptyList(New With {Key .SysID = message.SysID, .From = sender, .Subject = message.EmailSmsLog.Subject, _
                    .MailIcon = emailIcon, .DateSent = dateSent, .TimeSent = timeSent, _
                    .IsRead = message.IsRead}
)

Additionally In Q3 2011 release we have a new Linq based grouping which is turned on by default. This type of grouping has a huge performance optimization and internally uses Dynamic Linq for grouping. Also this grouping is controlled by the MasterTableView.EnableLinqGrouping property(default value is true). More information you could find here:
http://blogs.telerik.com/aspnet-ajax/posts/11-11-08/super-charged-performance-optimizations-for-telerik-s-asp-net-ajax-grid-in-q3-2011.aspx
To avoid the exception you could set the RadGrid.MasterTableView.EnableLinqGrouping property to "false". Please give it try and let me know if the issue still persists.

Looking forward for your reply.

Kind regards,
Radoslav
the Telerik team

[MFitzpatrick]

Your suggestion of creating the list directly fixed my issue.

Thanks for replying so quickly.

Mike