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When calling C1.Win.C1Report.C1Report.RenderToStream(Stream stream, FileFormatEnum fmt, String idPrefix, String fileName) the following exception occurs: "System.InvalidOperationException: The object is currently in use elsewhere".

System.InvalidOperationException: The object is currently in use elsewhere.   at System.Drawing.Graphics.Dispose(Boolean disposing)   at System.Drawing.Graphics.Dispose()   at C1.C1Pdf.ad.a()   at C1.C1Pdf.ad.a(al A_0)   at C1.C1Pdf.al.a(Stream A_0)   at C1.Win.C1Report.PdfFilter.EndReport()   at C1.Win.C1Report.Layout.h()   at C1.Win.C1Report.C1Report.k()   at C1.Win.C1Report.C1Report.a(ExportFilter A_0, Boolean A_1)   at C1.Win.C1Report.C1Report.RenderToStream(Stream stream, FileFormatEnum fmt, String idPrefix, String fileName)

   at C1.Win.C1Report.C1Report.RenderToStream(Stream stream, FileFormatEnum fmt)

 

We have been using this method for a long time and we have not yet seen this problem. I found another (old) post related to this (

http://helpcentral.componentone.com/CS/forums/p/70720/192794.aspx#192794) but there was no reply on this topic.

We are using .Net Framework version 1.1Version of 2.5.20062.212 of file "C1.Win.C1Report.dll"Regards, Frank

Hi,

just one guess: do you use threads to either render your reports or write them
to a file? If yes: try to remove them (accessing a GUI object from different
threads might cause strange problems in .NET 1.1 and will throw "cross thread
operation" exceptions in .NET 2.0).

Hope this helps

Wolfgang

We are using a locking mechanism to prevent multiple threads to enter the method which calls RenderToStream. So this should not be the cause of the problem. Unfortunately (and maybe not surprisingly) the problem is not reproducible.

Thanks for the hint

Frank

<eppinkf> wrote in message news:203928@10.0.1.98...

We are using a locking mechanism to prevent multiple threads to enter the method which calls RenderToStream. So this should not be the cause of the problem. Unfortunately (and maybe not surprisingly) the problem is not reproducible.

Thanks for the hint

Frank

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http://helpcentral.componentone.com/cs/forums/p/74829/203928.aspx#203928

Regarding the hint with the different threads: I wrote a UnitTest which calls the method from two different threads and both work fine. So at least the different threads are not a general problem.

Regarding the hint with opening and saving the Report Definition file in the C1Report Designer: Is there a known reason why this should work?

The problem is, that I cannot reproduce this problem and that the client is quite far away and I do not have the possibility to access the machine where the problem occurs. Therefore trial and error is difficult.

Any more hints are welcome.

Hi,

in .NET 1.1 (and somehow in .NET 2.0 either) the problem with "cross thread
operations" is that in some cases they do not occur reproducible. On my fast
dual core machine, they come up more often than on customer systems ;-).
But of course it is quite possible that your errors do not result from this.

Do you have the chance to take a look on the remote machine with e.g. TeamViewer?

Best regards

Wolfgang

Hi Wolfgang

What do you mean with "Remote Machine"? The error was seen once on one of our test PCs and once at the clients site. It is very hard if not impossible to access the PC at the clients site. We have full access to our test PC, but the problem is that without reproducibility what shall we check on this PC?

Best Regards

Frank