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Step Welcome greets the user.
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Step Welcome This step is the familiar greeting step, as shown in figure 10.4. From an implementation standpoint, this is by far the easiest step! No, Merlin is not animated. Step Reports This step lists all reports that the user is permitted to request based on the predefined Report Server role-based security policy, as shown in figure 10.5. The successful outcome of this step is the selection of a single report. The Report Wizard then evaluates the selected report to determine whether it is configured for a snapshot or for live execution. In the former case, Step Snapshot is shown. In the latter case, the Report Wizard checks to see whether the report requires custom parameters. If so, Step Parameters is shown; otherwise, the Report Wizard advances to Step Export. Step Snapshot If the report is configured for snapshot execution, this step allows the user to specify the snapshot execution options, as shown in figure 10.6. If the snapshot history is enabled, the user can request a specific history to be run from the Snapshot History grid. Alternatively, the user can select the Run the Report as a Snapshot option to request the latest snapshot cached copy of the report.
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INTRODUCING THE ADVENTURE WORKS REPORT WIZARD
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Step Reports prompts the user to select a report.
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Figure 10.6 If the report is configured for snapshot execution, Step Snapshot allows the user to select a specific history run.
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Step Parameters As we said in chapter 9, sometimes the HTML Viewer toolbar may fall short in handling more involved report parameter requirements. The trivial workaround is to delegate this responsibility to the application. In our case, the Report Wizard will handle the report parameters in these situations: When the report is configured explicitly to require custom parameters For example, one of the report parameters may be a multi-select parameter. In other cases, client-side parameter validation may be required. When the report is configured to be requested on the server side of the application, for example, from the business layer Because in this case the report will be requested via SOAP, the HTML Viewer won t be available. Therefore, the application has to take care of gathering and validating the report parameters. The Report Wizard handles the report parameters in Step Parameters (shown in figure 10.7). Step Parameters supports custom parameter data types, such as multi-select, as well as optional client-side validation. For example, as figure 10.7 shows, the report in this case takes an Employee multi-select parameter, which is a feature that is currently not supported by the HTML Viewer.
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Figure 10.7 Step Parameters handles the report parameters when the HTML Viewer is not enough.
INTRODUCING THE ADVENTURE WORKS REPORT WIZARD
Figure 10.8 settings.
Step Export prompts the user to specify the export format and device
Step Export During this step, the user specifies the report s export format and device settings, as shown in figure 10.8. We discussed the available export format and device settings in chapters 6 and 9, respectively. Step Confirmation Once the report request is ready, the only thing left to do is to ask the user to confirm it before it is handed out to the Report Server by showing Step Confirmation (figure 10.9). If the report is configured to be requested on the server side of the application, the Report Wizard gives the user an option to request the report to be generated asynchronously. Now that we ve seen how the Adventure Works Report Wizard works, let s look behind the scenes to see how it is implemented.
BEHIND THE SCENES OF THE ADVENTURE WORKS REPORT WIZARD
We thought that many of you might appreciate a behind-the-scenes tour, especially if your reporting requirements call for a similar implementation approach.
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REPORTING FOR WINDOWS FORMS APPLICATIONS
Confirming the report request
As an added bonus, we hope you will find some useful programming techniques that you can add to your programming arsenal, such as form inheritance, CodeDom code generation, dynamic control creation, caching, multithreading, and more. 10.3.1 Implementing the application framework As with any real-life application, it is always a good idea to spend some time up front and design a framework layer to take care of essential programming aspects, including storing and passing data among the application tiers and encapsulating common programming logic in a set of reusable classes. Let s see how the Report Wizard framework handles these programming tasks. Choosing the data entity The Report Wizard stores the report request details in an application-defined structure called ReportEntity that is located under the Entities folder in the AWReporterWin project. We use this entity for two purposes: to maintain state by capturing the user choices as the user navigates from one step to another and to encapsulate the report request details when submitting the request to the report fa ade in the case of reports generated on the server side of the application. As with any custom structure, we have several implementation options. You have probably used several of them in the past, including custom classes, arrays, XML, datasets, and so forth. We decided to use a typed dataset for the following reasons:
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