print barcode in vb.net Figure 12.23 To integrate OWC with .NET applications you have to install the OWC PIAs. in Visual C#

Encoder PDF417 in Visual C# Figure 12.23 To integrate OWC with .NET applications you have to install the OWC PIAs.

Figure 12.23 To integrate OWC with .NET applications you have to install the OWC PIAs.
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library that should point to the .NET Global Assembly Cache folder. If it doesn t, either PIAs are not installed or you will have to refresh the reference. You will also notice that VS.NET has helpfully created an interop assembly called AxOWC11. The purpose of this assembly is to host the OWC class wrappers. Unfortunately, this assembly won t allow you to sink many of the OWC events, as documented in Knowledge Base Article 328275. The article outlines the steps to regenerate the wrapper assembly for OWC version 10, which are also applicable for version 11. Because you need to reference PIAs, and getting them from the GAC is like performing brain surgery, we included the AxOWC11 source code and binary in the AWReporterWin\OWC11 folder. You ll need to remove the autogenerated reference to AxOWC11 inside VS.NET and replace it with a reference to our version so you can handle events successfully. You don t have to do this for the Data Miner demo because its project file already has the correct reference. Now that you have a good understanding of how the Office Web Components work, let s see how we can leverage them for the purposes of the Adventure Works Data Miner demo. Implementing the AW Data Miner presentation layer Let s start by taking a quick walk-through of the AW Data Miner user experience. Figure 12.24 shows the AW Data Miner UI. This sample can be launched from the 12 menu in the AWReporterWin project. As figure 12.24 shows, we selected the Sales by Territory and Product Category for 2004 report from the My Reports drop-down. The Pivot tab is selected and shows the pivot version of this report, which displays some data from the Sales cube we authored in section 12.2.2. We can drag measures and dimensions from the PivotTable Field List and drop them onto rows or columns to see the data from different angles. Once we re happy with the new version of the report, we can save it as our personal report. We can also switch to the Chart tab to see a chart report that uses the same data as the pivot report. As you would probably agree, this sample is packed with features. However, it took us only a few hours to implement it thanks to the Office Web Components. Let s now take a behind-the-scenes tour of the Adventure Works Data Miner, starting with the My Reports feature.
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CHAPTER 1 2
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REPORTING FOR OLAP APPLICATIONS
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Figure 12.24 The Adventure Works Data Miner solution uses Office Web Components to allow the user to create ad hoc reports.
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Implementing the My Reports feature Once we figured out the setup issues, implementing the Data Miner demo was straightforward. The Data Miner sample follows a design pattern similar to the one demonstrated by Dave Stearns in his book Programming Microsoft Office 2000 Web Components. This approach has proven very successful in some of my real-life applications. In its simplest implementation, you may find that one screen, the one shown in figure 12.24, may be able to satisfy most of your users dynamic reporting requirements. Most of the implementation effort of the Data Miner demo went into implementing the My Reports feature. It allows the users to retrieve preconfigured reports, personalize them any way they want, and save them for future retrieval. To accomplish this, we used the XMLData property, which represents in XML the current report definition (excluding the data) of the OWC PivotTable or ChartSpace component. In this respect, you can relate XMLData to the RDL report definition in RS.
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IMPLEMENTING AN OLAP SOLUTION: AW DATA MINER
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Here is a tip in case you need to convert a dynamic report generated with OWC to an RS-based report. Although XMLData is not based on the RDL schema, you can write an XSL transformation to generate the RS report definition from XMLData. Then, you can upload the report definition to the report catalog, as we showed in chapter 7.
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XMLData is a read/write property and can be used to save and restore the report layout. All three of the UI Office Web Components PivotTable, ChartSpace, and Spreadsheet expose this property. Although the Data Miner sample persists only the PivotTable report definition, with a minimum amount of programming effort you should be able to enhance it to support saving and restoring chart report layouts as well. To capture the report layouts, we created a table called Reports in the AdventureWorks warehouse database. This table has a Category field that classifies the report as standard or user-defined. In addition, the table saves the user s identity in the format DomainName/UserName. Users can see only the standard reports defined in this table plus the user-defined reports they have authored. To facilitate the access to the database, we built a web service fa ade, MyReports, which you can find under the 12 folder in the AWReporterWeb project. The fa ade exposes two web methods, GetReports and SaveReports, to retrieve or change the report definitions, respectively. When the Data Miner application starts, it calls down to the fa ade to retrieve the report list. It caches the reports in an ADO.NET dataset. The application s user interface logic prevents the user from making modifications to standard reports. All changes to the user-defined reports are cached locally in the dataset. When the user clicks the Update My Reports button, the modified user-defined reports are sent to the fa ade, which in turn propagates the changes to the database.
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Implementing dynamic chart reports To generate the chart report when the Chart tab is clicked, we bind the ChartSpace component to the PivotTable control, as shown in listing 12.1.
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