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If you examine the signatures of the LINQ to XML axis methods (or the identically named members of XContainer), you ll notice that they typically require you to specify what looks to be an XName object. Consider the signature of the Desendants() method defined by XContainer: public IEnumerable<XElement> Descendants(XName name) XName is odd in that you will never really directly make use of it in your code. In fact, since this class has no public constructor, you cannot make an XName object: // Error! Can't make XName objects! doc.Descendants(new XName("PetName")).Remove(); If you were to view the formal definition of XName, you will see that this class defines a custom implicit conversion operator (see 12 for information of defining custom conversion operators), which will map a simple System.String to the correct XName object: // We really make an XName in the background! doc.Descendants("PetName").Remove();

GetAllProfiles()

The good news is that you can use textual values to represent the names of elements or attributes when you work with these axis methods, and allow the LINQ to XML API to map your string data to the necessary object types.

FindProfilesByUserName()

N ote A bidirectional association means that both entities involved maintain a reference to each other. In our

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Let s continue the investigation of LINQ to XML with a new Console Application named ConstructingXmlDocs. Once you have done so, import the System.Xml.Linq namespace in your initial code file. As you have already seen, XDocument represents the entirety of an XML document in the LINQ to XML programming model, as it can be used to define a root element, and all contained elements, processing instructions and XML declarations. Here is another example of building XML data using XDocument: static void CreateFullXDocument() { XDocument inventoryDoc = new XDocument( new XDeclaration("1.0", "utf-8", "yes"), new XComment("Current Inventory of cars!"), new XProcessingInstruction("xml-stylesheet", "href='MyStyles.css' title='Compact' type='text/css'"), new XElement("Inventory", new XElement("Car", new XAttribute("ID", "1"), new XElement("Color", "Green"), new XElement("Make", "BMW"), new XElement("PetName", "Stan") ), new XElement("Car", new XAttribute("ID", "2"), new XElement("Color", "Pink"), new XElement("Make", "Yugo"), new XElement("PetName", "Melvin") ) ) ); // Save to disk. inventoryDoc.Save("SimpleInventory.xml"); }

FindInactiveProfilesByUserName()

Again, notice that the constructor of the XDocument object is in fact a tree of additional LINQ to XML objects. The constructor called here takes as the first parameter an XDeclaration, followed by a parameter array of objects (recall, C# parameter arrays allow you to pass in a comma delimited list of arguments, which are packaged as an array on your behalf): public XDocument(System.Xml.Linq.XDeclaration declaration, params object[] content) If you were to invoke this method from Main(), you d see the following data in the SimpleInventory.xml file: < xml version="1.0" encoding="utf-8" standalone="yes" > <!--Current Inventory of cars!--> < xml-stylesheet href='MyStyles.css' title='Compact' type='text/css' > <Inventory> <Car ID="1"> <Color>Green</Color> <Make>BMW</Make> <PetName>Stan</PetName> </Car> <Car ID="2"> <Color>Pink</Color> <Make>Yugo</Make> <PetName>Melvin</PetName> </Car> </Inventory> As it turns out, the default XML declaration for any XDocument is to use utf-8 encoding, XML version 1.0, as a standalone document. Therefore, you could completely delete the creation of the XDeclaration object and end up with the same data; given that just about every document requires this same declaration, use of XDeclaration is typically not that common. If you do not need to define processing instructions or a custom XML declaration, you can avoid the use of XDocument all together, and simply use XElement. Remember, XElement can be used to represent the root element of the XML document and all sub-objects. Thus, you could generate a commented list of inventory items as so: static void CreateRootAndChildren() { XElement inventoryDoc = new XElement("Inventory", new XComment("Current Inventory of cars!"), new XElement("Car", new XAttribute("ID", "1"), new XElement("Color", "Green"), new XElement("Make", "BMW"), new XElement("PetName", "Stan") ), new XElement("Car", new XAttribute("ID", "2"), new XElement("Color", "Pink"), new XElement("Make", "Yugo"), new XElement("PetName", "Melvin")

For example, if you want to remove the profile for the current user, you need only a single line of code: ProfileManager.DeleteProfile(User.Identity.Name) And if you want to display the full list of users in a web page (not including anonymous users), just add a GridView with AutoGenerateColumns set to True and use this code: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) GridView1.DataSource = ProfileManager.GetAllProfiles(ProfileAuthenticationOption.Authenticated) GridView1.DataBind() End Sub Figure 24-5 shows the result.

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