Creating a DotNetNuke Private Assembly with Crystal Reports - Part 3
page 3 of 5
by Eric Landes
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Report Manager Crystal Custom Objects Architecture

Before detailing the code used to display the parameters for a particular report, let’s go over the architecture of the classes used.  The Crystal assemblies are encapsulated within new assemblies that add functionality.  The new classes do not extend Crystal assemblies using inheritance, but rather by referencing the Crystal objects when needed. 

The reasoning for this includes the fact that some of Crystal contains COM components.  I have found that wrapping these objects into my own assemblies helps with certain problems associated with third party software.  Specifically there have been problems with nUnit and Crystal assemblies that have been solved by using separate assemblies to call Crystal.

For these reasons, our source code now contains a class CRParameterPanel.  This class is a refinement of an earlier article that did some of these same functions.  Instead of doing all the panel building activity within the page, this class inherits a panel from the class System.Web.UI.Webcontrols.  We’ll add the parameter input controls to the panel.  Also, in Part 4, the panel is where the report viewer will display.

Currently for purposes of this article, these classes are contained in the project Lancor.CrystalReportManager.  Best practice dictates that these classes should be in their own project, separated from the UI.  Perhaps this will happen for a future version of this. 


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User Comments

Title: Wrong Source code   
Name: Jesse
Date: 2006-02-07 10:41:45 AM
Comment:
The source code available here contains no more that a buggy DNN module with only a single form to store a list of files, but nothing about displaying the reports. Wrong version/ manipulation?

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