The textobject cannot add formula field which type is not string

Question

I am working on the crystal report 2008 sp2. I have a question about the textobject inner element problem. There is a formula named carryover, the formula content like this Shared NumberVar carryTotal. When I add this formula into a textobject at designer side, everything is okay. However, when I add it at SDK side, the application will raise error which triggered by CrystalDecisions.CrystalReports.Engine.ReportDocument's SaveAs function. I guess it is the type mismatch problem. So I modify the formula content to Shared NumberVar carryTotal; cstr(carryTotal), finally, it work. I want to know whether there is a way to resolve it rather than change formula or not?

Answer 1

The main code like this,
CrystalDecisions.CrystalReports.Engine.ReportDocument boReport = New CrystalDecisions.CrystalReports.Engine.ReportDocument();
boReport.Load("Report1.rpt")
cdRptDoc= boReport.ReportClientDocument;
Section section = cdRptDoc.ReportDefinition.Areas[0].Sections[0];
TextObject textobject = new TextObject();
Paragraphs paragraphs = new Paragraphs();
Paragraph paragraph = new Paragraph();
ParagraphElements paraElements = new ParagraphElements();
ParagraphFieldElement paraElement = new ParagraphFieldElement();
paraElement.DataSource = "{@carryover}";
paraElements.Add(paraElement);
paragraph.Add(paraElements);
paragraphs.Add(paragraph);
textobject.Paragraphs = paragraphs;
cdRptDoc.ReportDefController.ReportObjectController.Add(textobject, section ,-1);