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One of the nicest features of the XDocument is its support of searching, which allows you to find nodes when you know they are there somewhere but you aren t sure how many matches exist or where the elements are. To search an XDocument, all you need to do is use the Descendants() or DescendantNodes() method. Both methods allow you to search through the entire document tree in one step. For example, here s how you can use Descendants() on the entire SuperProProductList.xml document to get a list of prices: XDocument doc = XDocument.Load(file); // Find the matches. var results = doc.Descendants("Price"); // Display the results. lblXml.Text = "<b>Found " + results.Count<XElement>().ToString() + " Matches "; lblXml.Text += " for the Price tag: </b><br /><br />"; foreach (XElement result in results) { lblXml.Text += result.Value + "<br />"; } Figure 18-6 shows the result.

Private Function GetAllEntries() As List(Of BookEntry) ' Return a collection that contains BookEntry objects ' for each file in the GuestBook directory. ' This method relies on the GetEntryFromFile method. Dim entries As New List(Of BookEntry)() Try Dim guestBookDir As New DirectoryInfo(guestBookName) For Each fileItem As FileInfo In guestBookDir.GetFiles() Try entries.Add(GetEntryFromFile(fileItem)) Catch ' An error occurred when calling GetEntryFromFile(). ' Ignore this file because it can't be read. End Try Next Catch err As Exception ' An error occurred when calling GetFiles(). ' Ignore this error and leave the entries collection empty. End Try Return entries End Function Private Function GetEntryFromFile(ByVal entryFile As FileInfo) _ As BookEntry ' Turn the file information into a BookEntry object. Dim newEntry As New BookEntry() Dim r As StreamReader = entryFile.OpenText() newEntry.Author = r.ReadLine() newEntry.Submitted = DateTime.Parse(r.ReadLine()) newEntry.Message = r.ReadLine() r.Close() return newEntry End Function Private Sub SaveEntry(ByVal entry As BookEntry) ' Create a new file for this entry, with a file name that should ' be statistically unique. Dim random As New Random() Dim fileName As String = guestBookName & "\" fileName &= DateTime.Now.Ticks.ToString() & random.Next(100).ToString() Dim newFile As New FileInfo(fileName) Dim w As StreamWriter = newFile.CreateText()

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Figure 18-6. Searching an XML document The Descendants() method is great if you want to find an element based on its name. If you want to use more sophisticated searching, match only part of a name, or examine only part of a document, you have two choices. First, you can to write code that loops through all the nodes in the XDocument and checks each one. Second, you can use the LINQ to XML feature to perform a query that extracts matching XElement objects from your XDocument. This is a natural fit, because the XDocument class was originally introduced as part of the LINQ feature in .NET 3.5. You ll learn much more about LINQ, including how to use it to perform searches, in 24.

' Write the information to the file. w.WriteLine(entry.Author) w.WriteLine(entry.Submitted.ToString()) w.WriteLine(entry.Message) w.Flush() w.Close() End Sub End Class

XML has a rich set of supporting standards, many of which are far beyond the scope of this book. One of the most useful in this family of standards is XML Schema. XML Schema defines the rules to which a specific XML document should conform, such as the allowable elements and attributes, the order of elements, and the data type of each element. You define these requirements in an XML Schema document (XSD). When you re creating an XML file on your own, you don t need to create a corresponding XSD file instead, you might just rely on the ability of your code to behave properly. Although this is sufficient for tightly controlled environments, if you want to open your application to other programmers or allow it to interoperate with other applications, you should create an XSD. Think of it this way: XML allows you to create a custom language for storing data, and XSD allows you to define the syntax of the language you create.

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