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You can also use XPath to prefilter out XmlDataSource objects. For example, imagine you want to create a grid that shows a list of stars rather than a list of movies. To accomplish this, you need to use the XPath support that s built into the XmlDataSource to prefilter the results. To use XPath, you need to supply the XPath expression that selects the data you re interested in by using the XmlDataSource.XPath property. This XPath expression extracts an XmlNodeList, which is then made available to the bound controls. <asp:XmlDataSource ID="sourceDVD" runat="server" DataFile="DvdList.xml" XPath="/DvdList/DVD/Starring/Star" /> If that expression returns a list of nodes, and all the information you need to display is found in attributes, you don t need to perform any extra steps. However, if the information is in element text, you need to create a template. In this example, the template simply displays the text for each <Star> node:

ver since XML (Extensible Markup Language) first arrived on the scene in the late 1990s, it has been the focus of intense activity and overenthusiastic speculation. Based on nothing but ordinary text, XML offers a means of sharing data between just about any two applications, whether they re new or old, written in different languages, built by distinct companies, or even hosted on different operating systems. Now that XML has come of age, it s being steadily integrated into different applications, problem domains, and industries. Microsoft s .NET Framework uses XML heavily and gives ASP .NET applications a rich set of features for using and manipulating XML data. In this chapter, you ll learn how to work with XML in streams and strings. Additionally, you ll look at the new XML data binding features in .NET 2.0. XML data binding works analogously to data binding with the SqlDataSource and ObjectDataSource controls. It lets you extract XML content from a file and show that data in a bound control, all without requiring you to write a single line of code.

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You can use the XmlDataSource programmatically. Call XmlDataSource.GetXmlDocument() to cause it to return the file s content as an XmlDocument object.

<asp:GridView ID="GridView1" runat="server" DataSourceID="sourceDVD" AutoGenerateColumns="False"> <Columns> <asp:TemplateField HeaderText="DVD"> <ItemTemplate> <%# XPath(".") %><br /> </ItemTemplate> </asp:TemplateField> </Columns> Figure 12-11 shows the result.

.NET 2.0 refines its XML classes but keeps the overall model almost the same. At one point, early in the beta cycle, there were more ambitious plans to make XPathNavigator the new standard for editing XML and to outfit it with a high-powered set of editing features. However, the cost of forcing developers to rework their code was considered too great. ASP.NET 2.0 does have one innovation when it comes to XML the new XmlDataSource control. With this control, you can bind to XML data sources just as easily as you bind to databases and data objects. However, this has a few limitations. For example, the XmlDataSource is best suited to XML content in a file, and it doesn t support two-way binding. For those reasons, you ll still need to use the XML classes in .NET in many scenarios. The XmlDataSource control is described in the XML Data Binding section later in this chapter.

However, this has a catch. As explained earlier, the XmlDocument.Nodes collection contains only the first level of nodes. Each of these nodes can contain nested nodes through its own XmlNode.Nodes collection. However, the IEnumerable implementation that the XmlDocument uses doesn t take this into account. It walks over only the upper level of XmlNode objects, and as a result you ll see only the top level of nodes, as shown in Figure 12-9.

You can create a simple record browser using the XmlDataSource.XPath property. Just let the user choose an ID from another control (such as a drop-down list), and then set the XPath property accordingly: sourceDVD.XPath = "/DVDList/DVD[@ID=" & dropDownList1.SelectedValue & "]" This works because data binding isn t performed until the end of the page life cycle.

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