Regarding the Report's Default Value

Question

Now the default value of the CrystalDecisions.CrystalReports.Engine is empty which is a problem clarified by both Luke and Don Williams. Don provided a good tips for code, referring Don's reply at Jan 10, 2014 and Jul 31, 2012, I’ve tested this and it is worked, and I got a default value. However, the other sever problem has been occurred. Since the unmanaged code (COM) can't construct (casting) to the managed code directly, since it is a interface. Otherwise the original all Crystal Document objects will be wiped out, and become null value. Here is my analysis referred Don’s code:
foreach (CrystalDecisions.ReportAppServer.DataDefModel.ParameterField rasParamfield in                                                             myReport.ReportClientDocument.DataDefController.DataDefinition.ParameterFields)
Here myReport is coming from CrystalDecisions.CrystalReports.Engine.ReportDocument, so this code will not be useful if you want to keep myReport active. From this point, I do not know what another alternatives could be used to achieve this or using Reflection , and how?
Any responses would be so appreciated.
J. Huang

Answer 1

Hi Johnson,
Correct, but mostly it works without having to set the viewer to the RAS Report Object but just in case you do then I use a flag id RAS has modified the report and set the viewer accordingly:
You still need to open the report by the Engine but then assign it to the RAS client Doc:
add these assemblies:
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
using CrystalDecisions.ReportAppServer;
using CrystalDecisions.ReportAppServer.ClientDoc;
using CrystalDecisions.ReportAppServer.Controllers;
using CrystalDecisions.ReportAppServer.ReportDefModel;
using CrystalDecisions.ReportAppServer.CommonControls;
using CrystalDecisions.ReportAppServer.CommLayer;
using CrystalDecisions.ReportAppServer.CommonObjectModel;
using CrystalDecisions.ReportAppServer.ObjectFactory;
using CrystalDecisions.ReportAppServer.Prompting;
using CrystalDecisions.ReportAppServer.DataSetConversion;
using CrystalDecisions.ReportAppServer.DataDefModel;
using CrystalDecisions.ReportSource;
Global flag:
bool IsRpt = true;
CrystalDecisions.CrystalReports.Engine.ReportDocument rpt = new CrystalDecisions.CrystalReports.Engine.ReportDocument();
CrystalDecisions.ReportAppServer.ClientDoc.ISCDReportClientDocument rptClientDoc;
In the routine to you update the values add IsRpt =  false;
In your open method use this:
rptClientDoc = new CrystalDecisions.ReportAppServer.ClientDoc.ReportClientDocument();
rpt.Load(rptName.ToString(), OpenReportMethod.OpenReportByTempCopy);
rptClientDoc = rpt.ReportClientDocument;
Then in the view report button use this:
try
    if (!IsRpt)
        crystalReportViewer1.ReportSource = rptClientDoc.ReportSource;
    else
        crystalReportViewer1.ReportSource = rpt;
catch (Exception ex)
    btnSQLStatement.Text = "ERROR: " + ex.Message;
Don