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9.3

Error: Subreport could not be shown?

Asked by cylikon in MS SQL Reporting, Programming for ASP.NET

Tags: ASP.NET SSRS LocalReport PDF

I have an existing (working) report in my ASP.NET application that is rendered through the use of the LocalReport Class.  This report currently has several parameterized subreports (all of which work).  I had added two new subreports to the existing master but both error out and show "Error: Subreport could not be shown" when rendered.

In the ASP.NET application there is a function for setting up the rendering.  It instantiates the datatables that feed the master report and subreports.  It then instantiates a ReportDataSource for each datatable and then adds each of these to the DataSources collection of my instantiation of the LocalReport class.

I am able to pass one of the main Parameters passed into the master report to a subreport and display it.  But as soon as I add a field to the report it breaks.  I have looked at the underlying XML to see that the DataSources and DataSets for my "broken" subreports match the other working subreports.  

I have tried using a very simple subreport with just one textbox connected to the same datasource that feeds the master report but it also results in the same symptom ("Error: Subreport could not be shown").

How can I debug/diagnose this?

I've run through this example...
http://www.developersdex.com/asp/message.asp?p=1116&r=5769218
Its close but I think I have already determined that I have added the datasource for the subreport to the datasources collection of the master.  Please tell me if I have not made that clear in my code snippets.

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//Create datatable objects
//...just the last three lines of this section...
dsReport.dtAppComponentDataTable dtAppComponent = new dsReport.dtAppComponentDataTable();
        dsReport.dtAppBusinessFunctionsDataTable dtAppBusinessFunction = new dsReport.dtAppBusinessFunctionsDataTable();
        dsReport.dtAppProductCategoryDataTable dtAppProductCategory = new dsReport.dtAppProductCategoryDataTable();
 
//Create ReportDataSource objects filled with the previously 
//           instantiated datatable objects
//...just the last three lines of this section...
ReportDataSource reportAppComponentDataSource = new ReportDataSource("dsReport_dtAppComponent", dtAppComponent);
        ReportDataSource reportAppBusinessFunctionDataSource = new ReportDataSource("dsReport_dtAppBusinessFunction", dtAppBusinessFunction);
        ReportDataSource reportAppProductCategoryDataSource = new ReportDataSource("dsReport_dtAppProductCategory", dtAppProductCategory);
 
 
//Add the ReportDataSources to the Reports DataSources collection
//...just the last three lines of this section...
localReport.DataSources.Add(reportAppComponentDataSource);
        localReport.DataSources.Add(reportAppBusinessFunctionDataSource);
        localReport.DataSources.Add(reportAppProductCategoryDataSource);
 
 
//Setup report parameters
ReportParameter paramAppID = new ReportParameter("AppID", dtApplication[0][dtApplication.AppIDColumn].ToString());
        localReport.SetParameters(new ReportParameter[] { paramAppID });
        ReportParameter paramAppName = new ReportParameter("AppName", dtApplication[0][dtApplication.AppNameColumn].ToString());
        localReport.SetParameters(new ReportParameter[] { paramAppName });
        ReportParameter paramAppIdentifier = new ReportParameter("AppIdentifier", dtApplication[0][dtApplication.AppIdentifierColumn].ToString());
        localReport.SetParameters(new ReportParameter[] { paramAppIdentifier });
 
//Setup various local settings and params for the render call
...
 
renderedBytes = localReport.Render(
            reportType,
            deviceInfo,
            out mimeType,
            out encoding,
            out fileNameExtension,
            out streams,
            out warnings);
 
        Response.Clear();
        Response.ContentType = mimeType;
        Response.AddHeader("content-disposition", "attachment; filename=ApplicationDetail." + fileNameExtension);
        Response.BinaryWrite(renderedBytes);
        Response.End();
[+][-]03/16/09 07:22 PM, ID: 23904237Assisted Solution

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[+][-]03/17/09 04:45 AM, ID: 23906794Accepted Solution

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About this solution

Zones: MS SQL Reporting, Programming for ASP.NET
Tags: ASP.NET SSRS LocalReport PDF
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Solution Provided By: VikramMullick
Participating Experts: 2
Solution Grade: A
 
 
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