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SubReport cannot identify parameter

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Michael Gois
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Michael Gois asked on 16 Nov 2010, 05:42 PM
Hi
I am getting the following error when I produce a report which contains a sub report, and the sub report relies on filtering using a parameter: - The expression contains object 'parExpenseFormId' that is not defined in the current context. It doesnt seem to recognise that I have already added the parameter although I have.
This worked absolutely fine in an older version of Telerik Reporting but I have now had to upgrade to version 4.1.10.71 (Q2 2010) I am getting the error. I cannot use Q3 because it has another bug which prevents me from using it.
Can someone please help me - I am generating my SubReport in the following manner:

1. Main Report

SubReport

 

oSubRep = new SubReport();

 

 

Report oEntriesRep = ExpenseEntriesReportBuilder.GetReport(); // Create the sub report (see extract below)

 

oSubRep.Width =

new Unit(735, UnitType.Pixel);

 

oEntriesRep.DataSource = dsData.Tables[1];

oSubRep.ReportSource = oEntriesRep;

oSubRep.Parameters.Add(

"parExpenseFormId","Fields.[expense_form_id]");
oDetails.Items.Add(oSubRep); // Add the subreport to the details section of the report

2. This is how I generate the actual sub Report

 

 

 

ExpenseEntriesReportBuilder. GetReport()

 

{

 

Report oRep = new Report();

 

oRep.PageSettings = GetPageSettings();

oRep.Items.Add(GetHeaderSection());

oRep.Items.Add(GetDetailSection());

oRep.Items.Add(GetFooterSection());

oRep.Filters.Add(

new Filter("=Fields.[expense_form_id]", FilterOperator.Equal, "=Parameters.parExpenseFormId"));

 

 

return oRep;

 

}

Thanks in advance

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Steve
Telerik team
answered on 17 Nov 2010, 05:56 PM
Hi Michael Gois,

You've omitted to mention the most important thing - where do you use this code? Since we do not see anything dynamic in this setup, is there a reason why you have not set this up through the Report Designer like elaborated in the Creating Master-Detail Reports Using SubReports help article?

Kind regards,
Steve
the Telerik team
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Michael Gois
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answered on 18 Nov 2010, 08:43 AM
Hi Steve

Well I kept the code simple so that you could see the important bits. The report has to be dynamic as there are a number of fields which are either included or not included depending on certain things and names of field captions change depending on configuration as well. I considered using anchors to have fields that may or may not exist but it makes the report difficult to manage.

Now the strange thing I have noticed is I have another report which constructs the subreport in EXACTLY the same way, but it doesnt produce this error! The other interesting thing is if I set the value of parExpenseFormId I can get it to work, it seems to only break down when it has to get expense_form_id from the master report dataset, even though the field is present (as I mentioned before, this report worked fine with older versions of telerik reporting)

oSubRep.Parameters.Add("parExpenseFormId","Fields.[expense_form_id]");
to
oEntriesRep.ReportParameters.Add("parExpenseFormId", ReportParameterType.Integer, iExpenseFormId.Value.ToString());
it works, but I obviously cannot keep a constant value here otherwise it doesnt work for reports which contain multiple expense_form_id values.

Any suggestions would be appreciated!
Thanks
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Steve
Telerik team
answered on 18 Nov 2010, 10:45 AM
Hello Michael Gois,

One thing I notice now is that you're missing equal sign for the Parameter Value so that it could be evaluated i.e.:

oSubRep.Parameters.Add("parExpenseFormId","Fields.[expense_form_id]");

should be:

oSubRep.Parameters.Add("parExpenseFormId","=Fields.[expense_form_id]");

or even better:

oSubRep.Parameters.Add(new Telerik.Reporting.Parameter("parExpenseFormId", "=Fields.[expense_form_id]"));

Best wishes,
Steve
the Telerik team
See What's New in Telerik Reporting in Q3 2010 on Wednesday, November 17, 11am Eastern Time: Register here>>
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Michael Gois
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answered on 23 Nov 2010, 04:57 PM
Hi

Sorry for the late reply, I thought I had found a workaround but just realised I havent! That bit of code was just from me playing around trying different things. It is doesnt work even using

oSubRep.Parameters.Add(new Telerik.Reporting.Parameter("parExpenseFormId", "=Fields.[expense_form_id]"));

The issue I have now it doesnt actually even raise an error, but the sub report appears as a red rectangle instead, which is just as bad anyway!

As I said, this was working fine in Telerik 2009 Q2 but now its stopped. I had found a workaround for the issue I described and went live but now I've discovered this somewhere else and I have to sort it out ASAP as its on my live site. Should I raise a support ticket for faster response time?

Many thanks !
Michael
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Michael Gois
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answered on 24 Nov 2010, 10:01 AM
Hi Steve,

Just letting you know I submitted a support ticket for this with an attached solution to reproduce the problem, the ticket id is 369812 . I would like to keep this forum thread open so that when I have an answer I can post it here as well for other users in the future.

Thanks
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