another post about problems with ReportViewer

roberto posted on Wednesday, January 25, 2012

Hi everyone
I realized a sample WPF application in order to test Report Viewer (http://www.gotreportviewer.com/) + CSLA 3.8,
with main report and subreport, and dynamically dataset population, ecc

I'm facing a generic exception "Value cannot be null" .

In my production enveroinment CSLA objects load data from Entity Framework actually,
so I realized another very similar project, using EF objects in reports, and it works great!!!

I also read this post, but no success
http://wraithnath.blogspot.com/2011/04/reportviewer-object-datasource-nested.html

Is there a guideline ?
I didn't find any usefull info in other threads :(

Thank you very much

RockfordLhotka replied on Wednesday, January 25, 2012

This isn't enough information for us to help you. At the very least we need to know the following:

When does the exception occur?
What is the stack trace for the exception?

roberto replied on Wednesday, January 25, 2012

I developed a new sample app (wpf app), in order to reproduce same error as production code,
but everything works fine in this app, EF and CSLA as well. :(

This sample app is simpler than production code, where few "improvements" (ie: datasources managed programmatically) have been implemented.

I'll have a look again at "Option #1: Using Subreports" sample app (available here http://www.gotreportviewer.com/masterdetail/index.html), because of some "improvements" are partially based on that sampe app.

I'll be back with a new sample app, reproducing the error ... or fixing production code. :)

Thak you very much.