ASP.NET Web PDF Document Viewer/Editor Control Library

The feed aggregator module pulls RSS, RDF, and Atom feeds from other web sites and displays feed content on either a full-page or block view. You will probably use this module if you want to add a Recent news block to your site that pulls news from another site. Drupal creates both multiple full-page views and blocks for each feed; you can also categorize and display multiple feeds on a full-page or block. Drupal filters feeds for HTML tags you specify, so for example you could strip all <a> links from RSS feeds and theme as you want. The aggregator module is configured by navigating to Configuration Feed aggregator. This page displays all feeds, feed categories, and links to each. Start first at the SETTINGS tab to adjust settings that apply across all feeds, as shown in Figure 6-3 (you can also access this same page by clicking the Configure link next to the module name after the module has been enabled).

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This example uses a Xaml feature called a property element the <Grid.ColumnDefinitions> element does not represent a child object to be added to the grid, but instead indicates that we want to set the Grid object s ColumnDefinitions property. The <ColumnDefinition> elements it contains are added to the collection in that property, whereas the <Button> elements are added to the collection in the Children property of the Grid. Example 20-4. Grid with rows and columns

<Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition /> <ColumnDefinition /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="30" /> <RowDefinition Height="2*" /> <RowDefinition /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <Button Grid.Column="0" Grid.Row="0" Content="(0, 0)" /> <Button Grid.Column="1" Grid.Row="0" Content="(1, 0)" /> <Button Grid.Column="2" Grid.Row="0" Content="(2, 0)" /> <Button Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="3"

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If you look in the documentation you ll see that more than three types derive from Panel. However, the others are in the System.Windows.Controls.Primitives namespace, signifying that they are not meant for general use. These are specialized panels designed only to be used inside specific controls.

Content="Row 1, 3 columns wide" /> <Button Grid.Column="0" Grid.Row="2" Grid.ColumnSpan="3" Content="Row 2, 3 columns wide" /> <Button Grid.Column="1" Grid.Row="3" FontSize="50" Content="(3, 1)" /> </Grid>

In this final example, both a description of the download and a unique identifier are used. When the application comes to process this URL, the description can be ignored and the download looked up on the unique identifier. You might want to enforce agreement between the two segments for search engine optimization. Unfortunately, having multiple URLs pointing to the same logical resource yields poor results for search engines. Let s see how we can apply these ideas to create better URLs.

Figure 6-3. Configure the aggregator module by navigating to Configuration Feed aggregator SETTINGS. Number of items show in listing pages controls the number of feed items on the http://example.com/aggregator/sources and http://example.com/aggregator/categories pages. If cron is properly configured, you can use Discard items older than to automatically delete feed items older than a certain time. The Select categories using option determines how you sort feeds on a category page. If a category page displays feeds from multiple sources, users can select which feeds they want displayed. The checkboxes option allows users to select or deselect the displayed feeds and is good for a small number of feeds. The multiple selector option allows users to type in the names of feeds, which causes the text box to automatically prefill with available lists of feeds.

Figure 20-2 shows how this looks. The four rows are fairly clear each button belongs to just one row. The columns are less obvious you can see all three clearly in the first row, because there s one button in each, but the next two rows contain just one button each, spanning all three rows. And the final row contains a single button in the second column.

The Grid knows which columns and rows elements belong to, and how many they span, because each button in Example 20-4 has properties that control this. The Grid.Column and Grid.Row properties do what their names suggest, while the Grid.ColumnSpan and Grid.RowSpan properties determine how many grid cells the element occupies. The column and row default to 0, while the spans default to 1.

These properties use another special Xaml feature called attached properties. An attached property is one defined by a different type (e.g., Grid) than the object it is applied to (e.g., Button). The attached properties in Example 20-4 are attributes, but you can also set attached properties with the property element syntax shown earlier for example, if a <Grid> element could contain a <ToolTipService.Tool Tip> element, to set the attachable ToolTip property defined by the ToolTipService class. While Silverlight, WPF, and Xaml support the idea that properties don t necessarily have to be defined by the object on which they are set, C# has no syntax for this. So classes that define attachable properties also define get and set methods to enable those properties to be used from code. For example, the Grid class offers SetColumn, SetRow, and so on.

For years, the server platform has dictated portions of the URL, such as the .aspx extension at the end. This problem has been around since the beginning of the dynamic web and affects almost all current web technologies, so you shouldn t be surprised that many solutions to the problem have been developed. Although ASP.NET does offer options for URL rewriting, many ASP.NET developers ignore them. Many web technologies, such as PHP and Perl, hosted on the Apache web server, solve this problem by using mod_rewrite. Python and Ruby developers have taken to the MVC frameworks, and both Django and Rails have their own sophisticated routing mechanisms.