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method performs all necessary and boilerplate tasks and then calls your implementation of CreateChildControls. In other words, when you implement CreateChildControls in ASP.NET 2.0 composite controls, you only have to worry about building the control tree; the system does the rest.
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Examples of Composite Data-Bound Controls
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ASP.NET 2.0 defines a few key composite data-bound controls, such as GridView, FormView, and DetailsView. The GridView control can be considered the successor to the DataGrid, with the added ability to take advantage of data source controls. As you ll see in more detail in the section titled The GridView Control, the GridView control supports several new features, including the built-in ability to sort, edit, page, select, and update data. In short, the GridView is what most developers wanted the ASP.NET 1.x DataGrid to be. The DetailsView and FormView controls have no counterpart in ASP.NET 1.x. Both render a single record at a time from the associated data source, optionally providing paging buttons to navigate between records. The difference between the two is in the use of templates. The DetailsView control provides a flexible and customizable user interface but a fixed layout. The FormView control is fully templatized. As Figure 7-3 shows, a details view is similar to the Form view of an Access database.
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Figure 7-3 Comparing the Access Form view and the ASP.NET details view
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The DetailsView and FormView controls are typically employed to update existing records and insert new ones. They fully benefit from and apply the new two-way binding model that was briefly mentioned in 5. Both controls lend themselves well to building master/detail views of data when used along with a GridView or a DataGrid.
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7
Data-Bound Controls
Hierarchical Data-Bound Controls
The HierarchicalDataBoundControl class is the foundation of hierarchical databound controls such as TreeView and Menu. The class is marked as abstract and, unlike its fellow CompositeDataBoundControl class, doesn t provide significant built-in services. The class acts as a logical container for controls that consume hierarchical data. Two of these controls are the TreeView and the Menu.
Building a Tree-Based Data View
The TreeView control can bind to any data source object that supports the IHierarchicalDataSource interface. In 6, you saw examples of such objects, including XmlDataSource and SiteMapDataSource. The TreeView also exposes a DataSource property of type Object, which can be assigned an XmlDocument type. You can bind a DataSet with nested relations only if you first transform it into an XmlDataDocument or into plain XML. In the latter case, though, you must first set the XML string to the Data property of an XmlDataSource object and bind using the XML data source control. By default, the TreeView binds XML nodes to its own nodes in a way that reflects the name of the node rather than a particular attribute or the inner text. The result is shown in the left pane of Figure 7-4. As you can see, it doesn t look particularly useful.
Figure 7-4 A TreeView control bound to XML hierarchical data
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You can control the node-to-node association by using a bunch of binding parameters. In particular, you can bind the properties of a treeview node to a specific data source field by specifying tree node bindings. A TreeNodeBinding object defines the relationship between each data item and the node it is binding to.
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<asp:treeview id="MyTree runat="server DataSourceId="XmlView"> <DataBindings> <asp:TreeNodeBinding Depth="2 DataMember="customerid TextField="#innertext /> </DataBindings> </asp:treeview>
To fully understand this example, consider the XML schema shown earlier in Figure 7-4. The node binding applies at level 2 and involves all the nodes named customerid. (The case is important.) By default, the TreeView node displays the value returned by the ToString method of the data item, which turns out to be just the node name. The TextField property of the TreeNodeBinding object changes this default to the specified attribute name or the inner text. As a result, the customerid node of Figure 7-4 is replaced by the inner text of the node at level 2, or by any other specified attribute. In addition to customizing the node text, you can indicate the ToolTip field, the image URL field, and the URL to navigate to when the node is clicked. The TreeView control can also support graceful expand/collapse functionality, depending on client capabilities, and a customizable look and feel that includes tree node images, plus/minus indicators, selection check boxes, and styles. For performance reasons, individual treeview nodes are not rendered through controls but as plain text.
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