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DataTable dt1 = GetDataTable(students); IEnumerable<DataRow> seq1 = dt1.AsEnumerable(); string name = seq1.Where(student => student.Field<int>("Id") == 7) .Select(student => (string)student["Name"]) .Single(); Console.WriteLine("Student's name is '{0}'", name); That is a fairly simple example. Notice that I set the Name member of the Student record of the student whose Id is 7 to null. Also notice that instead of using the Field<T> operator, I just index into the DataRow and cast the value to a string. Let s take a look at the results: Unhandled Exception: System.InvalidCastException: Unable to cast object of type 'System.DBNull' to type 'System.String'. So what happened What happened is that the DataColumn object s value is DBNull, and you can t cast that to a string. There are some rather verbose solutions I could take to alleviate this complication, but this is what the Field<T> operator is designed to simplify for you. Let s take a look at the same example, except this time I use the Field<T> operator to obtain the DataColumn object s value. Listing 10-15 is the code. Listing 10-15. An Example with the Field Operator When There Is a null Present Student[] students new Student { Id new Student { Id new Student { Id new Student { Id }; = = = = = { 1, Name = "Joe Rattz" }, 7, Name = null }, 13, Name = "Stacy Sinclair" }, 72, Name = "Dignan Stephens" }

Console.WriteLine(vea.Message); valid = false; }, true); Console.WriteLine("Document validated {0}.{1}", valid "successfully" : "unsuccessfully", System.Environment.NewLine); XElement bookParticipant = xDocument.Descendants("BookParticipant"). Where(e => ((string)e.Element("FirstName")).Equals("Joe")).First(); bookParticipant.Element("FirstName"). AddAfterSelf(new XElement("MiddleName", "Carson")); valid = true; bookParticipant.Validate(bookParticipant.GetSchemaInfo().SchemaElement, schemaSet, (o, vea) => { Console.WriteLine("An exception occurred processing object type {0}.", o.GetType().Name); Console.WriteLine(vea.Message); valid = false; }, true); Console.WriteLine("Element validated {0}.{1}", valid "successfully" : "unsuccessfully", System.Environment.NewLine); This code is identical to the previous example except instead of adding a MiddleInitial element, we added a MiddleName element that is invalid. Here are the results: Here is the source XML document: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants>

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/** * The ShowAdapter calls a MethodBinding with the same signature * as the <code>processShow</code> method. */ public class ShowAdapter implements ShowListener, StateHolder { /** * The MethodBinding signature for ShowListener methods. */ public static Class[] SIGNATURE = new Class[] { ShowEvent.class }; /** * Creates a new ShowAdapter. * * @param showMethod the MethodBinding to adapt */ public ShowAdapter( MethodBinding showMethod) { _showMethod = showMethod; } /** * Processes a ShowEvent. * * @param event the show event */ public void processShow( ShowEvent event) { FacesContext context = FacesContext.getCurrentInstance(); _showMethod.invoke(context, new Object[]{event}); }

Listing 7-74. Using SetElementValue to Update, Add, and Delete Child Elements // 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 XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); Console.WriteLine(System.Environment.NewLine + "Before updating elements:"); Console.WriteLine(xDocument); // First, I will use XElement.SetElementValue to update the value of an element. // Since an element named FirstName is there, its value will be updated to Joseph. firstParticipant.SetElementValue("FirstName", "Joseph"); // Second, I will use XElement.SetElementValue to add an element. // Since no element named MiddleInitial exists, one will be added. firstParticipant.SetElementValue("MiddleInitial", "C"); // Third, I will use XElement.SetElementValue to remove an element. // Setting an element's value to null will remove it. firstParticipant.SetElementValue("LastName", null); Console.WriteLine(System.Environment.NewLine + "After updating elements:"); Console.WriteLine(xDocument); As you can see, first I call the SetElementValue method on the firstParticipant element s child element named FirstName. Since an element already exists by that name, its value will be updated. Next, I call the SetElementValue method on the firstParticipant element s child element named MiddleInitial. Since no element exists by that name, the element will be added. Lastly, I call the SetElementValue method on the firstParticipant element s child element named LastName and pass a null. Since a null is passed, the LastName element will be removed. Look at the flexibility that the SetElementValue method provides. I know you can t wait to see the results: Before updating elements: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> After updating elements: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joseph</FirstName> <MiddleInitial>C</MiddleInitial> </BookParticipant> </BookParticipants>

Document validated successfully. An exception occurred processing object type XElement. The element 'BookParticipant' has invalid child element 'MiddleName'. List of possible elements expected: 'MiddleInitial, LastName'. Element validated unsuccessfully. As you can see, the element is no longer valid. Now, this example may seem a little hokey because we said to imagine a user is editing the document. No developer in their right mind would create a user interface that would intentionally allow a user to create edits that would be invalid. But imagine if that user is in reality some other process on the XML document. Perhaps you passed the XML document to someone else s program to make some update and you know they personally have it in for you and are seeking your personal destruction. Now it may make sense to revalidate. You know you can t trust them.

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