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How would the CopyToDataTable operator possibly know which record already in the destination DataTable corresponds to a record in the source DataTable In other words, when it tries to copy a record from the source DataTable to the destination DataTable and has to honor the LoadOption parameter, how does it know whether it should just add the record from the source DataTable or update an already existing record in the destination DataTable The answer is that it doesn t, unless it is aware of primary key fields in the DataTable Therefore, for this prototype of the CopyToDataTable operator to work properly, the destination DataTable object must have the appropriate fields specified as the primary key fields Without specifying primary keys, this prototype will result in appending all the records from the source DataTable to the destination DataTable.

// we 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(firstParticipant.Attribute("type").Value); Here we use the Attribute method to return a reference to the type attribute. We then display the attribute s value using its Value property. If all goes as expected, the output should be the following: Author Remember, though, instead of obtaining the attribute s value via its Value property, we could have just cast the attribute to a string.

XElement.Attributes()

There is one additional complication to be cognizant of when working with this prototype of the operator Since by using this prototype you are possibly interested in original versus current version.

FacesContext UIViewRoot renderResponse() HtmlForm ProShowOneDeck ProShowItem ProShowItem ProShowItem

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We can gain access to all of an element s attributes with its Attributes method. This method returns a sequence of XAttribute objects. Listing 7-80 is an example.

values of fields, do not forget that with this prototype of the CopyToDataTable operator, a field doesn t have an original version unless the AcceptChanges method has been called. Attempting to access the original version when one does not exist causes an exception to be thrown. However, you can call the HasVersion method on each DataRow object before attempting to access the original version to determine if there is an original version to prevent this type of exception.

// we 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",

XAttribute("type", "Author"), XAttribute("experience", "first-time"), XElement("FirstName", "Joe"), XElement("LastName", "Rattz"))));

As an example of the first CopyToDataTable operator prototype, I will simply modify a field in a DataTable, create a new DataTable from the modified DataTable by calling the CopyToDataTable operator, and then display the contents of the new DataTable. Listing 10-17 is the code. Listing 10-17. Calling the First Prototype of the CopyToDataTable Operator Student[] students new Student { Id new Student { Id new Student { Id new Student { Id }; = = = = = { 1, Name = "Joe Rattz" }, 7, Name = "Anthony Adams" }, 13, Name = "Stacy Sinclair" }, 72, Name = "Dignan Stephens" }

After you have completed queuing any events delivered with this request, and all request values have been applied to their UIComponents, it is time to broadcast and process events that have phaseId set to the default value (PhaseId.ANY_PHASE) or have phaseId set explicitly for this phase (PhaseId.APPLY_REQUEST_VALUES) the Apply Request Values phase. If there are events to deliver in this phase, the processDecodes() method on the UIViewRoot is called first. This method takes all queued events and broadcasts to each component in the component hierarchy. In the application, the only event fired during this request is the ShowEvent delivered by the UIShowOne component Renderer. The UIShowOne component has the phase identifier set to PhaseId.INVOKE_APPLICATION, which indicates to the request-processing lifecycle that this event must be delivered in the Invoke Application phase. In this phase, the processApplication() method on the UIViewRoot is called first. This method broadcasts any events that have been queued for the Invoke Application

foreach(XAttribute attr in firstParticipant.Attributes()) { Console.WriteLine(attr); } The output is this: type="Author" experience="first-time"

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