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The first capability we want to illustrate is constructing an XElement object from literal values It is not a common need, but the code to do it most clearly illustrates the creation of inner elements and attributes as part of the total construction Listing 715 shows the code for creating an Employees element that contains three child Employee elements, each of which contains one attribute and three child elements
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Listing 715: Creating an Employees Element
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XElement xmlEmployees = new XElement("Employees", new XElement("Employee", new XAttribute("EmployeeId", "10"), new XElement("FirstName", "John"), new XElement("MiddleInitial", "B"), new XElement("LastName", "Durant")), new XElement("Employee", new XAttribute("EmployeeId", "11"), new XElement("FirstName", "Susan"), new XElement("LastName", "Shank")), new XElement("Employee", new XAttribute("EmployeeId", "12"), new XElement("FirstName", "John"), new XElement("LastName", "Basilone")) );
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If we subsequently wished to expand our xmlEmployees XElement object into an XDocument object, perhaps because we were about to send it to a remote recipient and wanted to add a declaration, we would simply do this:
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XDocument docEmployees = new XDocument( new XDeclaration("10", "utf-8", "yes"), xmlEmployees);
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If we want to create a new XElement object whose child elements consist of only those employees who have a middle initial, we execute a LINQ to XML query against docEmployees and construct a new document from the result The LINQ to XML query to do this, and place the result into an XDocument named xmlEwMI, is as follows:
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XElement xmlEwMI = new XElement("EmployeesWithMIs", xmlEmployees Descendants("Employee") Where(EwMI => EwMIElement("MiddleInitial") != null));
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The corresponding XPath syntax, "//Employee[MiddleInitial]", is certainly more concise but not necessarily easier to understand or maintain In general, LINQ to XML is easier to read, and XPath is more concise Now let s change our requirement a little bit Instead of creating new XML from already-existing XML, as we have just done, we ll create an XElement from the output of a LINQ to Objects query Think back to our application data, where we have an Employee object whose Orders property contains the collection of that employee s orders We want to query that collection to obtain all the orders that shipped late, and store the result in an X object In doing so, we want to specify which Order properties are to be captured and also specify what their XML types, attribute or element, and names will be In addition, we want the orders to be sequenced by descending value Once we have captured the information as XML, we wish to write it to a file in device storage Listing 716 shows the code for doing this
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Listing 716: Selecting and Persisting Late Orders as XML
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Employee employee = AppDataCurrentEmployees[EmployeeID]; string XmlFileName = @"My Documents\LateOrdersxml"; XElement xmlLateOrders; xmlLateOrders = new XElement( "LateOrders", employeeOrders Where(order => orderShippedDate > orderRequiredDate) OrderByDescending(order => orderNetValue) Select(order => new XElement( "Order", new XAttribute("OrderID", orderOrderID), new XAttribute("CustomerID", orderCustomerID), new XAttribute("Value", orderNetValue), new XElement("Ordered", orderOrderDate), new XElement("Required", orderRequiredDate), new XElement("Shipped", orderShippedDate)) ) ); XDocument docLateOrders = new XDocument( new XDeclaration("10", "utf-8", "yes"), xmlLateOrders); docLateOrdersSave(XmlFileName);
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When we run the application, we set a break point at the last line of code shown in Listing 716 When the application enters break mode, we use the XML visualizer to look into docLateOrders and see the results, as shown in Figure 712 Of all the features provided by LINQ to XML, the one that is illustrated in Listing 716 is the most beneficial and the greatest leap forward No matter what application data must be exported, and no matter what XML format it must be in, you can provide it And that is a nice capability indeed So, given the list of features mentioned in Table 71 plus the new features that we just covered, which ones should you focus on Which ones are you must likely to use in your application Our recommendation is this: If the XML that your application will be sending and receiving is of a known and unchanging syntax, use XML serialization and, if helpful, the supporting tools, such as XSDEXE If the schema of the data is unknown or unpredictable at design time, or if the subset of data that will be used cannot be determined until runtime, use LINQ to XML and LINQ to Objects One way or the other, your application will be able to send, receive, and persist the XML data that other applications provide or require
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