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CHAPTER 8 XML AND WEB DEVELOPMENT
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Building XPath Expressions Dynamically
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As a final feature for our site, we are going to let the user enter a range of years, and query the uploaded file for matching nodes. For this feature, instead of using XmlDocument class, you will use another class that implements a read-only in-memory representation of the document and that is highly optimized for XPath querying: XPathDocument. When we introduced XmlDocument, we said it is an implementation of the W3C DOM standard. As such, it s built around the concepts laid out in that specification. Microsoft developers realized that the DOM is not particularly efficient at executing XPath queries because of the way it stores its information as collections of nodes containing child nodes, and so on. They also discovered that many scenarios don t actually require a read/write representation, especially for query processing. We have such a scenario in our application already: reporting doesn t require any editing features. As a result, the XPathDocument class was created. It s a really simple class that contains nothing but a CreateNavigator() method (the implementation of IXPathNavigable.CreateNavigator()). Once you have a navigator, you deal with queries and results in the same way as you did with an underlying XmlDocument. That s the beauty of XPathNavigator and the modularization achieved in System.Xml! Try It Out: Query Based on User Input To allow execution based on user input, your code will build an XPath expression based on what s contained in the text boxes on the UploadListReport page when the Execute button is clicked. It will use the values to filter the matching nodes and show them in the second (currently invisible) table on the page. 1. Open the UploadListReport page in the designer, double-click the Execute button (btnExecute), and add the following code: Private Sub btnExecute_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles btnExecute.Click Dim ns As String = "http://www.apress.com/schemas/friendsreunion" Try ' Clear any previous state Dim row As TableRow = tbDates.Rows(0) tbDates.Rows.Clear() tbDates.Rows.Add(row) ' Set up the document Dim doc As New XPathDocument(GetReader()) ' Get the navigator over the document Dim nav As XPathNavigator = doc.CreateNavigator() ' Set up the manager Dim mgr As New XmlNamespaceManager(nav.NameTable) mgr.AddNamespace("af", ns) ' Build the expression to execute Dim path As String = String.Format("/af:Friends/af:User/" + _ "af:Attended[af:YearIn>={0} and af:YearOut<={1}]", _
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CHAPTER 8 XML AND WEB DEVELOPMENT
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txtYearFrom.Text, txtYearTo.Text) Dim expr As XPathExpression = nav.Compile(path) expr.SetContext(mgr) Dim it As XPathNodeIterator = nav.Select(expr) Do While it.MoveNext() ' Create the empty row and cells row = New TableRow row.Cells.Add(New TableCell) row.Cells.Add(New TableCell) row.Cells.Add(New TableCell) row.Cells.Add(New TableCell) ' Grab the current navigator Dim attended As XPathNavigator = it.Current row.Cells(0).Text = attended.GetAttribute("Name", String.Empty) ' Iterate children of current Attended element attended.MoveToFirstChild() Do If attended.LocalName = "YearIn" AndAlso _ attended.NamespaceURI = ns Then row.Cells(1).Text = attended.Value ElseIf attended.LocalName = "YearOut" AndAlso _ attended.NamespaceURI = ns Then row.Cells(2).Text = attended.Value End If Loop While attended.MoveToNext() ' We have moved to Attended children ' Reposition to Attended node attended.MoveToParent() ' Get the parent (User) ID attribute attended.MoveToParent() row.Cells(3).Text = attended.GetAttribute("ID", String.Empty) ' Finally, add the new row tbDates.Rows.Add(row) Loop tbDates.Visible = True Catch ex As Exception lblError.Text = ex.Message pnlError.Visible = True End Try End Sub 2. Press Ctrl+F5, leaving UploadList.aspx as the start page. Select the sample XML document and click View Report.
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CHAPTER 8 XML AND WEB DEVELOPMENT
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3. Insert a range of years in the boxes on the UploadListReport page, and click Execute to view the results. Figure 8-15 shows an example of the output when the years 1980 and 1990 are inserted into the text boxes.
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Figure 8-15. Executing a query based on user input
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How It Works When you click the Execute button, you load an XPathDocument constructed with the reader returned by the method you have used so far: ' Set up the document Dim doc As New XPathDocument(GetReader()) You create the navigator and set up the namespace manager as you did before: ' Get the navigator over the document Dim nav As XPathNavigator = doc.CreateNavigator()
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