Crystal Reports 需要数小时才能通过代码导出到 pdf

Question

I´m facing this issue a long time, after months i´m still not able to find any solution. Here´s the scenario: VS 2019, Framework 4.6 and Crystal reports 13_0_27.

The following code takes hours to export a pdf (about 400 pages and 30.000 rows). If i open the report with crystal reports and export the document, same query by code, only takes seconds.

I tried a couple things, like ExportToStream and save the stream to file, or exporting direcly to disk and other post did read that "pdfFormatOptions.UsePageRange = True" should help, but same result.

The code works fine with smalls pdfs with, for example, 100 rows.

Informe.Load(Application.StartupPath + @"\informes\report.rpt");

        for (i = 0; i < Informe.Database.Tables.Count; ++i)
        {
            logOnInfo.ConnectionInfo.ServerName = "Server";
            logOnInfo.ConnectionInfo.DatabaseName = "BBDD";
            logOnInfo.ConnectionInfo.UserID = "user";
            logOnInfo.ConnectionInfo.Password = "user";
            Informe.Database.Tables[i].ApplyLogOnInfo(logOnInfo);
        }

        diskOpts.DiskFileName = PDFPath + _cabe.Guid + "_minutos.pdf";
        ExportOptions exportOpts2 = Informe.ExportOptions;
        exportOpts2.DestinationOptions = diskOpts;
        exportOpts2.ExportFormatType = ExportFormatType.PortableDocFormat;
        exportOpts2.ExportDestinationType = ExportDestinationType.DiskFile;
        
        try
        {
            Informe.RecordSelectionFormula = @" {CabeceraFacturas.Guid}='{" + _cabe.Guid.ToString() + "}'";
            //Informe.Export();
            Stream oStream;
            oStream = (Stream)Informe.ExportToStream(ExportFormatType.PortableDocFormat);

            using (FileStream fileStream = File.Create(RutaGeneracionPDF + _cabe.Guid + "_minutos.pdf", (int)oStream.Length))
            {
                byte[] bytesInStream = new byte[oStream.Length];
                oStream.Read(bytesInStream, 0, bytesInStream.Length);
                fileStream.Write(bytesInStream, 0, bytesInStream.Length);
                fileStream.Close();
            }


        }

Thanks!

Answer 1

After expending days and hours and headaches i finally did the trick.

in each detail (About 30.000 rows) i had a formula wich calculated some value with two fields of the detail and two from a joined view. the view was the problem when i was exporting by code (Exporting within Crystal Reports worked ok with no delay). I had to create a new table in SQL, inserting all the rows in view in this new table and add this table to report and..voilá, it worked, exported report in seconds.