The source of the report definition has not been specified

Question

I\'m using the following code trying to SetParametr :

    var report = new ReportParameter[1];
    report[0] = new ReportParameter(\"MyName\", \"Raha\");
            


        

Answer 1

It is possible that your report is an Embedded Resource and thus when you try to set a parameter with _reportViewer.ServerReport.SetParameters(report);//error your report definition has not yet been loaded.

Therefore if your report is an Embedded Resource then you need to call report.LoadReportDefinition(stream); // Get report definition before you set your report parameters.

i.e: The below returns a PDF byte array from a LocalReport

public byte[] ProcessReportToPDFBytes(List rds, Stream stream, string fileName, string outputType, SqlParameter[] rptParameters)
    {
      // Variables 
      Warning[] warnings;
      string[] streamIds;
      string mimeType = string.Empty;
      string encoding = string.Empty;
      string extension = string.Empty;

    using (LocalReport report = new LocalReport())
    {
            // Setup the report viewer object and get the array of bytes 
            report.EnableHyperlinks = true;
            report.EnableExternalImages = true;
            report.SetBasePermissionsForSandboxAppDomain(new System.Security.PermissionSet(System.Security.Permissions.PermissionState.Unrestricted));

            report.LoadReportDefinition(stream); // Get report definition
            // **** Set the Report Parameters AFTER the LoadReportDefinition ****
            if (rptParameters != null)
            {
              foreach (SqlParameter param in rptParameters)
              {
                report.SetParameters(new ReportParameter(param.ParameterName, param.Value == null ? "" : param.Value.ToString(), false));
              }
            }
            foreach (ReportDataSource rds1 in rds)
            {
              report.DataSources.Add(rds1); // Add datasource here 
            }

            // Render the PDF from the local report
            return report.Render("PDF", null, out mimeType, out encoding, out extension, out streamIds, out warnings);
    }
}

Hope this may help others with this similar error.