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The .NET Framework allows you to manipulate XML data with a set of classes in the System.Xml namespace (and other namespaces that begin with System.Xml). These types fully support the XML DOM (Document Object Model) Level 2 Core, as defined by the W3C. It also adds classes and methods that make it easier to read and write XML documents; navigate through nodes, attributes, and elements; and query, transform, and manipulate XML data in various ways.

ReadXmlSchema() InferXmlSchema()

Figure 12-13. Automatically generated TreeView bindings The TreeView s default XML representation still needs a lot to be desired. It shows only the document structure (the element names), not the document content (the element text). It also ignores attributes. To improve this situation, you need to set the TreeView.AutoGenerateDataBindings property to false, and you then need to explicitly map different parts of the XML document to TreeView nodes. <asp:TreeView ID="TreeView1" runat="server" DataSourceID="sourceDVD" AutoGenerateDataBindings="False"> ... </asp:TreeView> To create a TreeView mapping, you need to add <TreeNodeDataBinding> elements to the <DataBinding> section. You must start with the root element and then add a binding for each level you want to show. You cannot skip any levels.

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The .NET Framework provides two approaches for writing XML data to a file: You can build the document in memory using the XmlDocument class and write it to a file when you re finished by calling the Save() method. The XmlDocument represents XML using a tree of node objects. You can write the document directly to a stream using the XmlTextWriter. This outputs data as you write it, node by node. The XmlDocument is a good choice if you need to perform other operations on XML content after you create it, such as searching it, transforming it, or validating it. It s also the only way to write an XML document in a nonlinear way, because it allows you to insert new nodes anywhere. However, the XmlTextWriter provides a much simpler and better performing model for writing directly to a file, because it doesn t store the whole document in memory at once.

.NET 2.0 adds support for XML directly to the DataTable class. This means you can use the ReadXml(), WriteXml(), ReadXmlSchema(), and WriteXmlSchema() methods of the DataTable to read or write XML for a single table in a DataSet.

The approach you use to customize bindings with a TreeView is not completely finalized and may change in the final release of ASP.NET 2.0.

You can use both the XmlDocument and the XmlTextWriter to create XML data that isn t stored in a file. Both of these classes allow you to write information to any stream, and the XmlDocument allows you to retrieve the raw XML as string data. Using techniques such as these, you could build an XML document and then insert it into another storage location such as a text-based field in a database table.

Using the XML methods of the DataSet is quite straightforward, as you ll see in the next example This example uses two GridView controls on a page The first DataSet is filled directly from the Employees table of the Northwind database (The code isn t shown here because it s similar to what you ve seen in the previous chapters) The second DataSet is filled using XML Here s how it works: once the DataSet has been created, you can generate an XML schema file describing the structure of the DataSet and an XML file containing the contents of every row The easiest approach is to use the WriteXmlSchema() and WriteXml() methods of the DataSet These methods provide several overloads, including a version that lets you write data directly to a physical file.

Each <TreeNodeDataBinding> must name the node it binds to (through the DataMember property), the text it should display (DataField), and the hidden value for the node (ValueField). Unfortunately, both DataField and ValueField are designed to bind to attributes. If you want to bind to element content, you can use an ugly hack and specify the #InnerText code. However, this shows all the inner text, including text inside other more deeply nested nodes.

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