1957717 - How to "clear" the Crystal Reports WPF and viewer

SAP Knowledge Base Article - Public

1957717 - How to "clear" the Crystal Reports WPF and viewer

Symptom

  • A Crystal Report is sent to the viewer.
  • What API should be used to clear out the first report, before sending the next report to the viewer?

Environment

  • SAP Crystal Reports, developer version for Microsoft Visual Studio
  • Microsoft Visual Studio (2010 / 2012)

Cause

  • The WPF viewer does not have any exposed APIs that would clear the viewer.

Resolution

  • Work-Around:
  1. Create a blank.rpt report with nothing in it, no database connection.
  2. Save the report with the option "Saved data" enabled.
  3. Use the following code:

private void button1_Click(object sender, RoutedEventArgs e)
{
   // Button1 to view the first report   
   CrystalDecisions.CrystalReports.Engine.ReportDocument doc = new CrystalDecisions.CrystalReports.Engine.ReportDocument();
    doc.Load(@"c:\reports\formulas1.rpt");
    crystalReportsViewer2.ViewerCore.ReportSource = doc;
    crystalReportsViewer2.ViewerCore.Visibility = Visibility.Visible;
}
private void button2_Click(object sender, RoutedEventArgs e)
{
    // Button2 to close and display the blank report, thus simulating an empty viewer
    CrystalDecisions.CrystalReports.Engine.ReportDocument doc = new CrystalDecisions.CrystalReports.Engine.ReportDocument();
    doc.ReportClientDocument.Close();
    doc.Load("C:\\reports\\blank1.rpt");
    crystalReportsViewer2.ViewerCore.ReportSource = doc;
}

Keywords

CRVS CR4VS 2012 2010 NET VS C# empty remove blank out , KBA , BI-DEV-NET-SDK , .NET SDK / COM SDK , How To

Product

SAP Crystal Reports, developer version for Microsoft Visual Studio