Using the DataSet XML Methods in .NET framework

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Using the DataSet XML Methods
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As we ve seen, the .NET Framework exposes a set of classes that allow you to manipulate XML data directly. However, if you need to use relational operations such as sorting, filtering, or retrieving related rows, the DataSet provides an easier mechanism. Furthermore, the XML classes don t support data binding, so if you intend to display the data to users, you must use the DataSet XML methods. Fortunately, the choice between treating any given set of data as an XML hierarchy or relational DataSet isn t mutually exclusive. As we ll see later in this chapter, the XmlDataDocument allows you to manipulate a single set of data by using either or both sets of tools. The GetXml and GetXmlSchema Methods Perhaps the most straightforward of the XML methods supported by the DataSet are GetXml and GetXmlSchema, which simply return the XML data or XSD schema as a string value. Retrieve a DataSet Schema Using GetXmlSchema
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1. Open the XML project from the Start page or the File menu. 2. In the Solution Explorer, double-click GetXml.vb. Visual Studio displays the form in the form designer.
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3. Double-click Show Schema. Visual Studio opens the code editor and adds the Click event handler. 4. Add the following code to the handler: 5. Dim xmlStr As String 6. 7. xmlStr = Me.dsMaster1.GetXmlSchema() Me.tbResult.Text = xmlStr 8. Press F5 to run the application. Visual Studio displays the application window.
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9. Click GetXml. Visual Studio displays the GetXml form.
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10. Click Show Schema. The application displays the DataSet schema in the text box.
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11. Close the GetXml form and the application.
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1. Open the XML project from the Start page or the File menu. 2. In the Solution Explorer, double-click GetXml.cs. Visual Studio displays the form in the form designer.
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3. Double-click Show Schema. Visual Studio opens the code editor and adds the Click event handler. 4. Add the following code to the handler: 5. string xmlStr; 6. 7. xmlStr = this.dsMaster1.GetXmlSchema(); this.tbResult.Text = xmlStr; 8. Press F5 to run the application. Visual Studio displays the application window.
9. Click GetXml. Visual Studio displays the GetXml form.
10. Click Show Schema. The application displays the DataSet schema in the text box.
11. Close the GetXml form and the application. Retrieve a DataSet s Data Using GetXml
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1. In the code editor, select btnData in the Control Name combo box, and then select Click in the Method Name combo box. Visual Studio adds the Click event handler to the code. 2. Add the following code to the handler: 3. Dim xmlStr As String
4. 5. xmlStr = Me.dsMaster1.GetXml Me.tbResult.Text = xmlStr 6. Press F5 to run the application. Visual Studio displays the application window. 7. Click GetXml. Visual Studio displays the GetXml form. 8. Click Show Data. Visual Studio displays the XML data in the text box.
9. Close the GetXml form and the application. 10. Close the GetXml form designer and code editor window.
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1. In the form designer, double-click Show Data. Visual Studio displays the code editor window and adds the Click event handler to the code. 2. Add the following code to the handler: 3. string xmlStr; 4. 5. xmlStr = this.dsMaster1.GetXml(); this.tbResult.Text = xmlStr; 6. Press F5 to run the application. Visual Studio displays the application window. 7. Click GetXml. Visual Studio displays the GetXml form. 8. Click Show Data. Visual Studio displays the XML data in the text box.
9. Close the GetXml form and the application. 10. Close the GetXml form designer and code editor window. The ReadXmlSchema Method The DataSet s ReadXmlSchema method loads a DataSet schema definition either from the XSD schema definition or from XML. ReadXmlSchema supports four versions, as shown in Table 15-1. You can pass the method a stream, a string identifying a file name, a TextReader, or an XmlReader object. Table 15-1: ReadXmlSchema Methods Method ReadXmlSchema(stream) Description Reads an XML schema from the specified stream Reads an XML schema from the files specified in the string parameter Reads an XML schema from the specified TextReader Reads an XML schema from the
ReadXmlSchema(string)
ReadXmlSchema(TextReader)
ReadXmlSchema(XmlReader)
Table 15-1: ReadXmlSchema Methods Method Description specified XmlReader ReadXmlSchema does not load any data; it loads only tables, columns, and constraints (keys and relations). If the DataSet already contains schema information, new tables, columns, and constraints will be added to the existing schema, as necessary. If an object defined in the schema being read conflicts with the existing DataSet schema, the ReadXmlSchema method will throw an exception. Note If the ReadXmlSchema method is passed XML that does not contain inline schema information, the method will infer the schema according to the rules discussed in the following section. Create a DataSet Schema Using ReadXmlSchema
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