DESIGNING REPORTS in Visual Basic .NET

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Understanding report items With RS you can use the report items shown in table 4.1 to display data and graphical elements.
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Table 4.1 Report items you can use to display data and graphical elements Description The textbox is the report item that you will use most often to display text information. Textbox elements can contain static text or data from the underlying data source. You can use expressions for the textbox content. You use the image item to display binary images for visual effects (backgrounds, logos, etc.) or to display data stored as images from the report data source. The subreport item defines a placeholder that points to another report. The line item is a graphical element that you can use to enhance the presentation of your report, e.g., to separate a report group from its details. Rectangles can be used in two ways: as a graphical element and as a container for other report items. Users familiar with .NET development can make an analogy to the panel element. Similar to the panel, you can place report items within a rectangle and you can move them with the rectangle.
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Some of the report items shown in table 4.1 deserve more attention. Let s take a closer look. Working with images The Report Server supports the following image formats: JPEG, BMP, GIF, and PNG. To display the actual image in the image report item, you set the Source property. The image source can be defined as: Embedded In this case, the image data is serialized (MIME-encoded) and embedded in the report definition file. When the report is uploaded to the report catalog, the image is saved in the Report Server database. If you embed the same image in different reports, each report gets its own copy of the image. Similar to working with report-specific data sources, you use the embedded image option when you want to distribute all report-related items in one file. External The image refers to an image file that is located in the same project or to a fully qualified URL. If you specify an image that is in the same project, only the name of the image is stored in the report definition file. The actual image is shared across all reports that use it. This simplifies image maintenance because if the image is updated, the change will propagate through all reports that reference the image. You typically use external images for implementing report banners and logos. For example, all the reports inside the AWReporter project use an external image (AWC.jpg) to display the company logo. If you specify a fully qualified URL, the image is stored on a server and accessed ANATOMY OF A REPORT 107
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through a URL. When you drop an image item from the toolbox, the Image Wizard appears, as shown in figure 4.3. To enter a valid URL path to an image, choose Web. The wizard validates the URL for you so you will know if you typed the path correctly. To select an image that is located in your project, choose Project. Both of these options set the Source property to External.
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When a report is previewed in the Report Designer, external image items are displayed using the credentials of the user. When the report is run on the Report Server, the Report Server uses the unattended execution account. When an unattended execution account is not specified, the Report Server uses the Anonymous user account. If either of these accounts does not have proper rights, the image will not be displayed. For more information on setting up the unattended execution account, see the section Configuring an Account for Unattended Report Processing in the RS documentation.
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Database The image is bound to an image column from the report dataset. For example, the Product Catalog report included in the RS samples uses this option to show the product image for each product. The External option deserves additional attention. We usually shy away from storing images in the database for performance and maintenance reasons. A better approach is to store just the image URL that points to the image file located on a network share or another web server.
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Figure 4.3 The Image Wizard lets you specify how you want to store and retrieve the images used in your reports.
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