Silverlight Reporting Upgrade - ReportParameters are NULL

[Richard]

Hi, 

 System Set UP : VS 2010 (I know, I know out of my control here), Silverlight 4 with Telerik Reports Upgrade Wizard to Q2 2012.

 

 I have been tasked with upgrading the reports in my project to the latest version. I have done this by using the Wizard which was pretty close to perfect but needed me to make a few changes to get it functional.

 

As part of the reports the existing software passes a load of parameters to the reports by using the event  

  public void BeginRender(RenderBeginEventArgs args)

 

I have debugged this and seen all of the properties being populated nicely. The problem occurs when actually in the report and trying to access some of the report parameters. All of the values are null and I cannot work out why?

 

I have a semi work around -: 

        void TNAnalysisReport_ItemDataBinding(object sender, EventArgs e)
        {           
            _aCollectionOfParameters = (sender as Telerik.Reporting.Processing.Report).Parameters;            
        }      

However this does not work when populating subreports.... I really need a fix as to why the parameter values are being populated but not passed? Is there anything I can check to see why?

Any pointers would be most appreciated.

 

[Richard]

Hi Telerik, 

 Any thoughts or pointers on how I can get a resolution to the parameters no longer being passed as they were?

Rich

[Stef]

Hello Rich,

To get the parameters' values passed from the viewer you need to use them in expressions or access the processing report's Parameters collection. For more details check Understanding Events and Using Report Events.


If you need further help, please elaborate on the reason to access report parameters in the report and on the report definition.

Regards,
Stef
Telerik

[Richard]

Hi Stef, 

 Thanks for replying to this issue.

 I've been tasked with upgrading an existing app using Telerik Reports (v. 5.1.11.928)  and bringing its reports into a more manageable state as its been floundering for a while now. (v. 9.1.15.624).

 The previous version passes variables up to the server by using the old BeginRender method - when this has been called it seems that the properties automagically appeared back on the server once the -:

"InitializeComponent();"

Had been called, then the parameters seemed to magically appear in the Report->ReportParameters dictionary. Since upgrading the DLL's these values are no longer appearing and its caused a lot of problems with the set of reports I am dealing with. 

My current work around is to use the event -: this.ItemDataBinding

 Then accessing the sender object here I can get the reports parameters and store them locally -:

     this.Parameters = (sender as ReportItemBase).Report.Parameters; 

its not ideal but it seems to be working currently.  I guess my question is - What changed and is this way to do it now going forward?

 

[Stef]

Hello Richard,

There are a lot of changes between Telerik Reporting Q2 2011 SP1 and Q2 2015 SP1. In general, there are several major changes that may concern your project:

• Reports should be wrapped in a report source object before being set to a report viewer, SubReport or action - How to migrate your project to utilize the new ReportSource objects.
• As of Q1 2013 there are removed several obsolete properties and namespaces, which can be fixed automatically by gradually upgrading and touching the reports in the report designer as suggested in the linked above forum. Or manually edit the reports per the listed API CHANGES.
• As of Q2 2013 Telerik Reporting is built against .NET4, which is supported in Visual Studio 2010+ versions.
• As of Q3 2013 there is a new web viewer - the HTML5 Report Viewer, which is a client-side widget served by a running Reporting REST service, dedicated to work with the viewer. For more details how it works, please check  this forum thread
• As of Q1 2014 the WPF and Silverlight ReportViewer controls use only implicit styles. More details about the styling approaches and dependencies of the Silverlight Report Viewer are available in the following articles:
  • How to: Add report viewer to a Silverlight application
  • Setting a theme of the WPF/Silverlight Report Viewer (Q1 2014 and later)
  • Upgrade Path Q3 2014

It is recommended also to check the release notes of all major releases up to now - Release History. There are changes in the paging mechanism as of Q2 2012 and changes in the way parameters are handled as well - Understanding Events.

Regards,
Stef
Telerik