Exception: [ChangeEngineParamsByKeep] Object reference not set to an instance of an object.

patwolf · Post by **patwolf** » Tue Feb 17, 2009 6:59 pm

In one of my reports I set:

Stimulsoft.Report.StiOptions.Engine.ReportCache.LimitForStartUsingCache = 50;
Stimulsoft.Report.StiOptions.Engine.ReportCache.AmountOfQuickAccessPages = 30;
report.ReportCacheMode = Stimulsoft.Report.StiReportCacheMode.Auto;

Then when running the report on page 50 an exception occurs with this error message:
Method : [ChangeEngineParamsByKeep]
Object reference not set to an instance of an object.

If I set LimitForStartUsingCache to 53 the exception occurs on page 53.

Thanks,
Patrick

Stimulsoft 2009.1.338 on VS 2008; .NET 3.5; SQL Server 2005; C#

Post by **Edward** » Wed Feb 18, 2009 8:24 am

Hi Patrick,

Please set report.ReportCacheMode = Stimulsoft.Report.StiReportCacheMode.On

If the error persists, please send a test project to support[at]stimulsoft.com.

Thank you.

patwolf · Post by **patwolf** » Wed Feb 18, 2009 12:14 pm

Edward wrote: set report.ReportCacheMode = Stimulsoft.Report.StiReportCacheMode.On

What is the difference between Auto and On please?

Thanks,
Patrick

Post by **Edward** » Thu Feb 19, 2009 3:32 am

Hi Patrick.

The difference here is very simple.

The report will put the very first page into the cache when report.ReportCacheMode = Stimulsoft.Report.StiReportCacheMode.On.

And setting report.ReportCacheMode = Stimulsoft.Report.StiReportCacheMode.Auto tells to the report engine that the first rendered page which will be placed into the cache would have a number from the following static property:

Stimulsoft.Report.StiOptions.Engine.ReportCache.LimitForStartUsingCache

The Stimulsoft.Report.StiOptions.Engine.ReportCache.AmountOfQuickAccessPages parameter must be greater than 5 and sets the number of pages which will be loaded from cache during the navigation through the rendered pages.

Thank you.

patwolf · Post by **patwolf** » Mon Feb 23, 2009 2:59 pm

I upgraded to the latest version 2/16 and the error is still happening..

Edward wrote:If the error persists, please send a test project to support[at]stimulsoft.com.

Since I can't send you the whole database how would it work please? Is just sending the report enough?

I also tried CacheAllReportData but it didn't help either.

Thanks,
Patrick

Post by **Edward** » Tue Feb 24, 2009 5:28 am

Hi Patrick,

In that case please show the full stack of the error though.

Thank you.

patwolf · Post by **patwolf** » Tue Feb 24, 2009 11:32 am

I would love to know the stack trace myself...

As the exception happens in the designer only a message box comes up with the error message i gave above...

Any idea on how I can get the stack trace from that?

thanks,
Patrick

patwolf · Post by **patwolf** » Tue Feb 24, 2009 11:27 pm

Hi,

this exception happens in so many reports it's very important that we find a solution for it:
Method : [ChangeEngineParamsByKeep]
Object reference not set to an instance of an object.

Thanks,
patrick

Post by **Edward** » Wed Feb 25, 2009 3:52 am

Hi Patrick.

The issue must be fixed in the build from the next Monday. We are going to add all necessary changes into this build. Please check it when it is available.

Thank you.

Post by **Vital** » Wed Feb 25, 2009 8:44 am

Hello Patrick,

Problem with cache solved. Patch will be available in next prerelease build.

Thank you.