NullReferenceException while Sorting

245

Buzurg in Jeanz posted over 16 years ago

I'm using UltraWebGrid on my web page. I've implemented my grid using LoadOnDemand set to XML. Paging is working fine for me but whlie sorting I get the following error when I call DataBind from InitializeDataSource.

[NullReferenceException: Object reference not set to an instance of an object.] Infragistics.WebUI.UltraWebGrid.RowsCollection.Sort(Boolean caseSensitive) +820 Infragistics.WebUI.UltraWebGrid.UltraWebGrid.SortGroupRows(RowsCollection rows) +150 Infragistics.WebUI.UltraWebGrid.UltraWebGrid.PerformGroupRows() +213 Infragistics.WebUI.UltraWebGrid.DBBinding.BindList(IEnumerable datasource) +1984 Infragistics.WebUI.UltraWebGrid.DBBinding.DataBind(Object dataSource, String dataMember) +1265 Infragistics.WebUI.UltraWebGrid.UltraWebGrid.DataBind() +855

Any help even a link to some knowledgebase article will be much helpfull. Quick response will be much appreciated.

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80

Simon posted over 15 years ago

Guys,

Did anything happen with this bug? I'm having the same with AutoGenerateColumns but am unable to add them manually!

Thanks
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19308

[Infragistics] Tony Lombardo posted over 15 years ago in reply to Simon

I think I ran into this same bug recently - bug number 11228. I was binding to a datareader on each postback, and didn't have any columns defined in the ASPX. There was a fix made to prevent the NRE from firing, but here were the development recommendations:
There are two ways to make it work.1. Create columns at Design time or at run time before databind() is called. Set AutoGenerateColumns to False and mark every column with IsBound=False. Do not call DataBind inside of the InitializeDataSource event handler. 2. Remove InitializeDataSource event handler. Put all data into the ViewState by binding from Page_Load on the first load:    protected void Page_Load(object sender, EventArgs e)
{
            if (!this.IsPostBack)
            {
                  SqlConnection con = new SqlConnection(this.sqldata.ConnectionString);
                  SqlCommand command = new SqlCommand("select * from Orders");
                  command.Connection = con;
                  con.Open();
                  SqlDataReader reader = command.ExecuteReader(CommandBehavior.CloseConnection);
                  this.UltraWebGrid1.DataSource = reader;
                  this.UltraWebGrid1.DataBind();
            }
}
Hope this helps,

-Tony
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Lukasz posted over 15 years ago in reply to [Infragistics] Tony Lombardo

Hi Tony,

we have the same problem and can not use your work arounds. Is there a hotfix available for 2008.3? Where can I find bug number 11228?

Thanks

Christoph
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28464

[Infragistics] Rumen Stankov posted over 15 years ago in reply to Lukasz

Hello,
There is a dedicated area in the public forums now that announced hotfixes:
http://forums.infragistics.com/forums/247.aspx
Latest hotfix was relased on Jan, 23rd, list of changes is available in the hotfix package. You can also always contact Developer Support direclty via the following link
http://www.infragistics.com/Support/#Overview
and request more information on a specific bug.
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vishal posted over 14 years ago in reply to [Infragistics] Rumen Stankov

On Button click I am creating the columns at runtime. Then setting the datasource and binding the data . First time it works fine. But when I click on button second time it gives below error :

at Infragistics.WebUI.UltraWebGrid.UltraGridColumn.get_SortingAlgorithmResolved() at Infragistics.WebUI.UltraWebGrid.RowsCollection.Sort(Boolean caseSensitive) at Infragistics.WebUI.UltraWebGrid.UltraWebGrid.SortGroupRows(RowsCollection rows) at Infragistics.WebUI.UltraWebGrid.UltraWebGrid.PerformGroupRows() at Infragistics.WebUI.UltraWebGrid.DBBinding.BindList(IEnumerable datasource) at Infragistics.WebUI.UltraWebGrid.DBBinding.DataBind(Object dataSource, String dataMember) at Infragistics.WebUI.UltraWebGrid.UltraWebGrid.DataBind()

Please suggest solution for this.
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