excel to pdf using itextsharp in c#

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Just as you could save from either an XDocument or an XElement, we can load from either as well. Loading into an element is virtually identical to loading into a document. Here are the methods available: static static static static static static XElement XElement XElement XElement XElement XElement XElement.Load(string uri); XElement.LoadTextReader textReader); XElement.Load(XmlReader reader); XElement.Load(string uri, LoadOptions options); XElement.Load(TextReader textReader, LoadOptions options); XElement.Load(XmlReader reader, LoadOptions options);

These methods are static just like the XDocument.Save methods, so they must be called from the XElement class directly. Listing 7-39 contains an example loading the same XML file we saved with the XElement.Save method in Listing 7-37.

XElement.Value on XElement Objects, XText.Value on XText Objects, and XComment.Value on XComment Objects

XElement xElement = XElement.Load("bookparticipants.xml"); Console.WriteLine(xElement); Just as you already expect, the output looks like the following: <BookParticipants> <BookParticipant type="Author" experience="first-time" language="English"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> Just as the XDocument.Load method does, the XElement.Load method has overloads that accept a LoadOptions parameter. Please see the description of these in the Loading with XDocument.Load() section previously in the chapter.

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In some cases, you don t want to go through the entire request-processing lifecycle, for example when the user decides to cancel the current transaction. The immediate attribute gives the application developer a way to override the PhaseId defined by the FacesEvent instance. This attribute can be set on UICommand components and takes true or false as valid values, and by setting the immediate attribute to true, an application developer can short-circuit the processing lifecycle, cancel a process, and navigate to another view. The immediate attribute is also available on the UIInput components. If set to true, validation will occur during decode and cause the conversion and validation processing (including the potential to fire ValueChangeEvent events) to occur during the Apply Request Values phase instead of in the Process Validations phase.

Each of these subclasses of XNode has a Value property that can be set to update the node s value. Listing 7-70 demonstrates all of them. Listing 7-70. Updating a Node s Value // I will use this to store a reference to one of the elements in the XML tree. XElement firstParticipant; XDocument xDocument = new XDocument( new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XComment("This is a new author."), new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); Console.WriteLine("Before updating nodes:"); Console.WriteLine(xDocument); // Now, lets update an element, a comment, and a text node. firstParticipant.Element("FirstName").Value = "Joey"; firstParticipant.Nodes().OfType<XComment>().Single().Value = "Author of Pro LINQ: Language Integrated Query in C# 2008."; ((XElement)firstParticipant.Element("FirstName").NextNode) .Nodes().OfType<XText>().Single().Value = "Rattz, Jr."; Console.WriteLine("After updating nodes:"); Console.WriteLine(xDocument); In this example, I update the FirstName element first, using its Value property, followed by the comment using its Value property, finally followed by updating the LastName element by accessing its value through its child XText object s Value property. Notice the flexibility LINQ to XML provides for getting references to the different objects I want to update. Just remember that it isn t necessary for me to access the LastName element s value by getting the XText object from its child nodes. I did that merely for demonstration purposes. Other than that, I would have directly accessed its Value property. Here are the results: Before updating nodes: <BookParticipants> <BookParticipant type="Author"> <!--This is a new author.--> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> After updating nodes:

Parsing with XDocument.Parse() or XElement.Parse()

How many times have you passed XML around in your programs as a string, only to suddenly need to do some serious XML work Getting the data from a string variable to an XML document type variable

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