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CHAPTER 1 0
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REPORTING FOR WINDOWS FORMS APPLICATIONS
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To facilitate building the URL report request string, we created a helper function called BuildURL, which is defined as a static method in the RsHelpers class. This function takes the report request entity as a parameter and returns the report s URL. Once you have the report s URL ready, requesting the report is a matter of shelling out to the browser, as you saw back in chapter 9.
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Process.Start ("IExplore", reportURL);
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Client-to-Fa ade-to-Report Server report generation As we mentioned, by default the Report Wizard generates reports by URL. You can configure a report to be requested on the server side of the application by adding the RemoteCall custom property to the Property column in the Catalog table. For example, to request the Employee Sales Freeform report in this way, add the following XML element to the report properties:
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<RemoteCall>True</RemoteCall>
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Once this is done, the Report Wizard will send the report request to the Reporting Fa ade. To simulate a distributed application, we created a Web service fa ade (ReportFacade.asmx), which you can find under the 10 folder in the AWReporterWeb application.
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Some of you may be curious about why I decided to implement the fa ade as a Web service instead of choosing .NET Remoting as a cross-machine communication mechanism. Indeed, I was initially planning to use .NET Remoting until I realized that Microsoft has deprecated this technology in the long term. The next version of Windows, code-named Longhorn, promotes the use of SOAP for communicating with service-oriented applications. For this reason, developers are advised to use .NET Remoting sparingly. For more information about building service-oriented applications, please see section 10.6.
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The ReportFacade Web service exposes the RenderReport method:
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[WebMethod] public byte[] RenderReport(ReportRequest reportRequest, out string sessionId){ string optionalString = null; byte[] reportPayload = RsAdapter.RenderReport(reportRequest, out optionalString); sessionId = optionalString; return reportPayload; }
This method delegates the responsibility of requesting the report to the RsAdapter. If you wonder why we have chosen to name the class RsAdapter , wait until chapter 12 when we explain the adapter concept in detail. RenderReport method, which THE ADVENTURE WORKS REPORT WIZARD 369
generates the report via SOAP, as we saw in chapter 9. There are several points worth mentioning about the inner workings of this method. The first one has to do with security. By default, the call to the Report Server will go out under the process identity of the Web application. This means that if you don t take extra steps to change the ASP.NET process identity (or the application pool s identity in IIS 6), the call will fail. Please refer to chapter 8 to learn more about how to properly set up the Windows authentication in this scenario. If you want the Report Server to see the report request coming under the identity of the interactive user (the user who has started the AWReporterWin application), you can impersonate the user by using the identity element in the application s web.config configuration file, as follows:
<identity impersonate="true"/>
Alternatively, you can explicitly set the identity of the call by setting up the Report Server proxy credentials in the RsHelpers.Proxy accessor, as follows:
rsProxy.Credentials=new System.Net.NetworkCredential("username", "password");
Second, as we mentioned in chapter 9, when requesting reports by SOAP, you have to take an extra step to display the report s images by saving the image streams to a shared location (one to which the interactive user has read permissions). The Reporting Fa ade does this by configuring the StreamRootPath device setting to point to a temp folder before calling the Report Server Render method. Then, the Reporting Fa ade downloads the images explicitly to this folder. Needless to say, you have to take care of cleaning up this folder, for example, by scheduling a job that deletes the files in this folder on a regular basis. Finally, if you want to leverage report session caching to process report more efficiently, you should take care of saving the report session identifier and passing it back to the Report Server when requesting the same report. The Reporting Fa ade does this by returning the session identifier through the sessionId output argument of the RenderReport method. After the call is completed, the Report Wizard updates the SessionID property of the ReportEntity object and sends it back when the same report is requested. Now that we ve seen how a WinForm client can provide an application front end to facilitate the report-generation process, let s see how we can make it more efficient by discussing some performance-enhancement techniques, including caching and multithreading.
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