Set subreport parameters and bindings problem

[Marcin]

Hi, i have a problem if i want to set subreport parameters and bindings at the same time from master report. Subreport parameters i set from designer, selecting "ReportSource" and than "Edit parameters". Subreport bindings I also set from designer (Poperty path: ReportSource, Expression: = GetReportSource(Fields.NestedClass) ). GetReportSource is method in master report .cs file:

public static ReportSource GetReportSource(object dataObject)
{
      var report = new TextReport();
      report.DataSource = dataObject;
      return new InstanceReportSource { ReportDocument = report };
}

When i fire my report i get exception "An error has occurred while processing the report. Processing canceled. Check the InnerException for more information. Invalid value of report parameter 'Title'." Parameter has null value (if i set in subreport "Allow Nulls" for parameter) report is showing.

If I remove parameter, data in subreport is well binded, and report shows properly. Also if I remove bindings report is showing properly and parameter has value.

[Nasko]

Hello Marcin,

As the exception you are receiving states, the Title parameter of your subreport doesn't have a value. In order to set the value of the parameter for each subreport in your master report modify the GetReportSource method as in the following code:

public static ReportSource GetReportSource(object dataObject, object title)
{
   var report = new TextReport();
   report.DataSource = dataObject;

   InstanceReportSource instanceReportSource1 = new InstanceReportSource();
   instanceReportSource1.ReportDocument = report;
   instanceReportSource1.Parameters.Add(new Telerik.Reporting.Parameter("Title", title));

   return instanceReportSource1;
}

and set your binding:
Poperty path: ReportSource, Expression: = GetReportSource(Fields.NestedClass, Parameters.Title.Value)

For more information on the topic, please check the examples in the How to: Set ReportSource for SubReport help article.

 

Regards,
Nasko
Telerik