Table datasource with Binbings is null

[Tomáš]

Hi,

i have subreport with datasource containt collection of objects. (So components replicate here). Among other i have panel with 2 tables whitch i want to hide if both tables are empty. Tables is fulfilling by binding datasource: ReportItem.DataObject.nameOfMySubClassCollectionInMainDataSource and its working fine. I try hiding the panel by parameters with conditional formating or manualy in code. But problem is that myTable.DataSource property is always null event in DataBound event. Of course after report starting table contains right data but in code i can't check it. Please help.

here is code, where debuger reports always null value:

private void manPrechodZTable_ItemDataBound(object sender, EventArgs e)
        {
            if ((manPrechodZTable.DataSource == null || (manPrechodZTable.DataSource as ExC_BodTrasy.ExC_Prechod[]).Length == 0))
            {
                this.ReportParameters[1].Value = true;
            }
            else
            {
                this.ReportParameters[1].Value = false;
            }
        }

Thanks,

Tomas Linhart, CZ

[Wan]

desire the answer......

[Peter]

Hi,

The easiest way to achieve hide the table when no data is available is to set a Binding for a table "header" Textbox.

Property Path	Expression
Parent.Visible	=IIF(Count(1)>0, True, False)

Check out the attached sample report that illustrates the suggested approach.

Up to the provided code snippet, we have noticed that you had used the Report Parameter definition item instead of the processing counterpart. The definition report parameter value is actually the default value. The sender of the event is always the processing counterpart of the data item and you can use it to access the processing report parameter. For more information check out the Using Report Parameters programmatically.
Additionally the data item's DataSource property returns the declarative data source component, not your data object. Instead to access the data items data you can use the following approach:

var table = (Telerik.Reporting.Processing.Table)sender;
var dataObject = table.DataObject;
var value = dataObject["MyColumn"]

All the best,
Peter
the Telerik team