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Я использую WPF (.net 4.8) и Telerik.Reporting. Я продолжаю получать это исключение: There is no report or the report is not previewed in the viewer. Assign a report and call the RefreshReport() method prior exporting. Но, насколько я знаю, я назначаю и обновляю.

 private void ShowPrintPreview(ReportBook reportBook)
        {
            //http://docs.telerik.com/reporting/programmatic-exporting-report
            Telerik.Reporting.Processing.ReportProcessor reportProcessor =
                new Telerik.Reporting.Processing.ReportProcessor();

            // set any deviceInfo settings if necessary
            System.Collections.Hashtable deviceInfo =
                new System.Collections.Hashtable();

            //wrap the document in a report source
            //http://docs.telerik.com/reporting/report-sources
            var IRS = new Telerik.Reporting.InstanceReportSource();
            IRS.ReportDocument = reportBook;

            Telerik.Reporting.Processing.RenderingResult result =
                reportProcessor.RenderReport("PDF", IRS, deviceInfo);

            ReportViewer rp = new();
            rp.ViewMode = ViewMode.PrintPreview;
            rp.ReportSource = IRS;
            rp.RefreshReport();
            //rp.PrintReport(); // print dialog
            rp.ExportReport("PDF", deviceInfo);
        }