CrystalReports 'System.InvalidCastException' occurred

Question

Hi Team, I'm getting the below error. Can some one please assist me on this? I'm using Windows 2012 R2 server and CrystalReport Runtime 13.0.x version installed on the server. Application built on Any CPU using VisualStudio 2010 Error Message: HandlingInstanceID: c68a0e37-5eb5-4cb5-9587-6d6030b79b48  An exception of type 'System.InvalidCastException' occurred and was caught.  ---------------------------------------------------------------------------  01/13/2015 16:26:11  Type : System.InvalidCastException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089  Message : Unable to cast object of type 'FileStreamDeleteOnClose' to type 'System.IO.MemoryStream'.

Answer 1

Hi Don,
I gave this a try and I got the same results I was getting before the change the ExportToStream is returning a object of type FileStreamDeleteOnclose instead of an object of type IO.Stream.
You have what I had before already, but here is what I changed it to in order to do what the developer asked:
Protected Friend Function GetPDF(ByVal genColsolidatedPDF As String) As IO.
Stream
Dim exportStream As System.IO.Stream = GenerateReport(genColsolidatedPDF).ExportToStream(ExportFormatType
.PortableDocFormat)
Using fileStream As New IO.FileStream(expPath, System.IO.FileMode.Create, System.IO.FileAccess
.Write)exportStream.CopyTo(fileStream)fileStream.Dispose()
exportStream.Close()
Return
exportStream
End Function
Private Function GenerateReport(ByVal genConsolPDF As String) As
ReportDocument
Dim connInfo As New
ConnectionInfo
Dim databaseLoginInfo As New
TableLogOnInfos
Dim reportDoc As New
ReportDocument
Dim tableSet As
Tables
'reportDoc = New ActiveSignatures 
reportDoc.Load(rptPath)
reportDoc.SetParameterValue(DAL.ParmName.MRId, BLL.SessionData
.EssInfo.MRID)reportDoc.SetParameterValue(cCONSOLIDATEPDF, genConsolPDF)
connInfo.ServerName = [Lib].ApplicationData.db_Server
connInfo.DatabaseName = [Lib].ApplicationData.db_Name
connInfo.UserID = [Lib].ApplicationData.db_UserId
connInfo.Password = [Lib].ApplicationData.db_Password
tableSet = reportDoc.Database.Tables
For Each singleTable As Table In
tableSet
Dim singleTableLogoninfo As TableLogOnInfo
= singleTable.LogOnInfo
singleTableLogoninfo.ConnectionInfo = connInfo
singleTable.ApplyLogOnInfo(singleTableLogoninfo)
Next
Return reportDoc
End Function
It seemed like the developer maybe wanted more information about how the report is then used, so this is what happens.  The report is then supposed to be returned as type IO.Stream and then it is to be converted to an IO.MemoryStream: 
Dim sourceFiles(sourceSize as MemoryStream)
sourceFiles(i) = New MemoryStream(GetByteArray(CType(parameters.SignaturePage, IO.MemoryStream)))
parameters.SignaturePage is the crytal report that is being returned, that is what needs to be IO.Stream, but is coming back as FileStreamDeleteOnclose.
When the application then tries to convert from FileStreamDeleteOnClose to IO.MemoryStream, that is where the error occurrs:  Exception: System.InvalidCastException: Unable to cast object of type 'FileStreamDeleteOnClose' to type 'System.IO.MemoryStream'.  But this is only occurring because I am getting back the incorrect object type from the ExportToStream call. 
Before I upgraded to SP 13 this worked fine, and has been working fine for years.  It is after SP13 that this ExportToStream stopped giving me the IO.Stream object type and is now returning the FileStreamDeleteOnClose.
I hope that helps!
Thank you,
Leah