Silverlight report blank until refresh

[Devin]

I have a report viewer in a silverlight control, and when it loads it comes up blank until I hit refresh on the viewer, and then the report is finally loaded. What could be happening? Here's the code I'm using:

public ReportWrapper()
{
    InitializeComponent();

    this.rptViewer.RenderBegin += new Telerik.ReportViewer.Silverlight.RenderBeginEventHandler(rptViewer_RenderBegin);
    this.Loaded += ReportWrapper_Loaded;

    this.rptViewer.ReportServiceUri = new Uri("http://webserver/reportserver/reportservice.svc");
    this.rptViewer.Report = "ReportLib.TestReport";
}

void rptViewer_RenderBegin(object sender, Telerik.ReportViewer.Silverlight.RenderBeginEventArgs args)
{

    args.ParameterValues["ID"] = ID;
}

[Steve]

Hello Devin,

We've tried this in our Silverlight demo project directly, here is the code:

public partial class MainPage : UserControl
   {
       public MainPage()
       {
           InitializeComponent();

           ReportViewer1.Report = "Telerik.Reporting.Examples.CSharp.ProductLineSales, CSharp.ReportLibrary";
           ReportViewer1.ReportServiceUri = new Uri("../ReportService.svc", UriKind.Relative);
       }

       private void ReportViewer1_RenderBegin(object sender, RenderBeginEventArgs args)
       {
           args.ParameterValues["ProductCategory"] = "Components";
           args.ParameterValues["ProductSubcategory"] = new object[] { "Brakes", "Chains" };
       }
   }

and it worked correctly. The two notable differences with your code being:

• the specified value for the Report property is not valid and the viewer would not find an available report type with such assembly qualified name.
• the ID variable might not be available at the time the report renders. Where does it come from and have you verified it has a value when the report is rendered?

All the best,
Steve
the Telerik team