Silverlight ReportViewer Questions

[Michael]

Hi,

I'm reviewing the Silverlight ReportViewer to see if it will be a good fit for my project.  Looking through the documentation and using .Net Reflector to look at the object model more closely I don't see a way to make calls to the report service via HTTPS, at least I don't see an obvious way.  Is there a sample application which demonstrates how to do this?  

Also I'd like to be able to pass parameters to the report but I don't want the parameters to be displayed to or entered by the end user.  Is there a way to do this?  If so, a sample application demonstrating how to do so would be most appreciated.

Thanks!

Michael

[Svetoslav]

Hi Michael,

Thank you for your interest in our tool
 
Please check the latest Telerik Reporting internal build that fixes the HTTPS shortcoming and brings some improvements in the Silverlight viewer's model. Although you can now access the parameters on the client side (ref. ReportViewerModel.Parameters property) there is no easy way to understand (from outside of the ReportViewerModel) when the parameter definitions are retrieved from the server (that is when the asynchronous service operations are completed) or when their values will be send back to the server. This is what we are currently working on.

Anyway we would appreciate if you can share with us your particular scenario and explain in more detail your goals and how would you like to pass values for the report parameters besides using the built-in UI. Your feedback will help us with this feature quite a bit.
 

Sincerely yours,
Svetoslav
the Telerik team

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[Iurie Coroban]

Hi, Svetoslav!
    Could you,please, provide an example,that shows how exactly to pass parameters to the report from Silvrlight application.

[Gerardo]

Hi Everybody,

I need help for send parameter in the silverlight Reportviewer, I can show the report with parameters but I need send parameters values by programing.

I see thah exist a <telerik:ReportParametersControl but how is function? somebody can showme an example? or somebody knows another way to do.

[Chris Gillies]

As far as I understand from Svetoslav's reply here and in this other thread (http://www.telerik.com/community/forums/reporting/telerik-reporting/passing-parameters-to-reportservice-from-silverlight-viewer.aspx), it is currently not possible to pass parameters from the Silverlight application to the viewer and Telerik are working on that for upcoming release.

Cheers

[Mike Lyncheski]

I also have a critical need to pass parameters from the Silverlight client application to the report server and then have these passed into my report control for retrieving data.  This seems like a very basic need and, if this is truly not available, a huge shortcoming.

Thanks for listening.

Mike

[Moises Casusol]

Hi,

   I have the same scenario, i need to pass parameters to the reportviewer but like it says it is not possible by the moment. Now its that possible if i use the htmlplaceholder and the WEB ReportViewer?, i mean, To pass some parameters from a silverlight application to the htmlplcaholder so the Web ReportViewer can use them to make the report.


Best Regards,
Moises

[Peter Staev]

Actually it is possible to pass parameters from the code to the reportviewer. Here is how to make it work.
In my scenario i'm hosting the SL reportviewer in a RadWindow. In the window i have a flag named m_bOverwriteReportParameters that is used to know whether the parameters need to be changed or not. Then in the constructor of RadWinow I add the following handler:

AddHandler CType(SLReportViewer.DataContext, ReportViewerModel).PropertyChanged, AddressOf ReportViewerModelPropertyChanged

The real change happens in the ReportViewerModelPropertyChanged handler :

Private Sub ReportViewerModelPropertyChanged(ByVal sender As Object, ByVal e As PropertyChangedEventArgs)
    'Hide the parameter area of the ReportViewer
    If e.PropertyName = "IsParametersAreaVisible" _
    AndAlso CType(SLReportViewer.DataContext, ReportViewerModel).IsParametersAreaVisible _
    Then
        CType(SLReportViewer.DataContext, ReportViewerModel).IsParametersAreaVisible = False
    End If

    If e.PropertyName = "Parameters" Then
        'Make sure the ReportViewerModel has the parameters initialized from the service
        If CType(SLReportViewer.DataContext, ReportViewerModel).Parameters IsNot Nothing _
        AndAlso CType(SLReportViewer.DataContext, ReportViewerModel).Parameters.Count > 0 _
        Then
            If m_bOverwriteReportParameters _
            Then
                'Here set the parameters you need to change programatically
                CType(SLReportViewer.DataContext, ReportViewerModel).Parameters(0).Value = "Parameter1"
                CType(SLReportViewer.DataContext, ReportViewerModel).Parameters(1).Value = "Parameter2"

                'Raise the flag, so we do not get into and endless loop of applying the parameters
                m_bOverwriteReportParameters = False

                'Call the ApplyReportParametersCommand so the report can be refreshed with the new parameters
                CType(SLReportViewer.DataContext, ReportViewerModel).ApplyReportParametersCommand.Execute(Nothing)
            Else
                m_bOverwriteReportParameters = True
            End If
        End If

    End If
End Sub

Making the above will allow the reportviewer to work correctly with the overriden parameters in the code. There is somehow a minor glitch that the reportviewer first renders the report with the default parameters values, show the generated report, and then goes "Rendering Report" again, and shows the report again but this time with the real parameters. But this is better than nothing, right :)

Hope this was helpful.

[Svetoslav]

Hi guys,

Please check the Programmatic Initialization of Report Parameter Values in Telerik Reporting Silverlight Viewer blog we have just published that describes the latest changes of the Silverlight ReportViewer's API and provides some guidelines how to pass parameters from client application.

Kind regards,
Svetoslav
the Telerik team

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Watch a video on how to optimize your support resource searches and check out more tips on the blogs.