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You may be wondering, under what circumstances would you not know the database until runtime It is true that for the typical application, the database is known while the application is being developed, and therefore LINQ to DataSet is not as necessary But what about a database utility type application For example, consider an application such as SQL Server Enterprise Manager It doesn t know what databases are going to be installed on the server until runtime The Enterprise Manager application allows you to examine whatever databases are installed on the server, with whatever tables are in a specified database There is no way the Enterprise Manager application developer could generate the LINQ to SQL classes at compile time for your database This is when LINQ to DataSet becomes a necessity.

type="Author"

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of the ShowListener interface but without directly implementing it. Code Sample 3-9 shows the source for the ShowListener method doShow(). Code Sample 3-9. A ShowListener Method doShow() package com.apress.projsf.ch3.application; import com.apress.projsf.ch3.event.ShowEvent; /** * ShowOneDeckBean is a backing bean for the showOneDeck.jspx document. */ public class ShowOneDeckBean { /** * The ShowListener method binding. * * @param event the show event */ public void doShow( ShowEvent event) { String oldShowItemId = event.getOldShowItemId(); String newShowItemId = event.getNewShowItemId(); System.out.println("BackingBean [oldShowItemId=" + oldShowItemId + "," + "newShowItemId=" + newShowItemId + "]"); } } This way of implementing a listener is provided as a convenience for application developers. However, it is also limiting in that the showListener attribute on the <pro:showOneDeck /> takes only one method binding; by contrast, associating a listener using a specific listener tag such as <pro:showListener ...> allows application developers to associate as many listeners as needed (for example, to log information about the event) and to associate one to actually process the event. From an application developer s point of view, an implementation of the ShowListener could look something like Code Sample 3-10. Code Sample 3-10. Implementation of the ShowListener Interface package com.apress.projsf.ch3.application; import com.apress.projsf.ch3.event.ShowEvent; import com.apress.projsf.ch3.event.ShowListener; public class MyShowListener implements ShowListener { public void processShow( ShowEvent event)

Although this part of the book is named LINQ to DataSet, you will find that the added operators really pertain to DataTable, DataRow, and DataColumn objects Don t be surprised that you don t see DataSet objects referenced often in this chapter We understand that in real-life circumstances, your DataTable objects will almost always come from DataSet objects However, for the purpose of database independence, brevity, and clarity, we have intentionally created simple DataTable objects programmatically, rather than retrieved them from a database, for most of the examples The LINQ to DataSet operators consist of several special operators from multiple assemblies and namespaces that allow the developer to do the following: Perform set operations on sequences of DataRow objects Retrieve and set DataColumn values Obtain a LINQ standard IEnumerable<T> sequence from a DataTable so Standard Query Operators may be called Copy modified sequences of DataRow objects to a DataTable.

In addition to these LINQ to DataSet operators, once you have called the AsEnumerable operator, you can call the LINQ to Objects Standard Query Operators on the returned sequence of DataRow objects, resulting in even more power and flexibility.

To traverse forward through an element s attributes, reference the NextAttribute property on an attribute. Listing 7-76 is an example. Listing 7-76. Accessing the Next Attribute with the NextAttribute Property // 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 XAttribute("experience", "first-time"), new XAttribute("language", "English"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); Console.WriteLine(firstParticipant.FirstAttribute.NextAttribute); Notice I use the FirstAttribute property to obtain a reference to the first attribute and then reference the NextAttribute property on it. Here are the results:

For the examples in this chapter, you will need to add references to your project for the System.Data.dll and System.Data.DataSetExtensions.dll assembly DLLs, if they have not already been added.

{ String oldShowItemId = event.getOldShowItemId(); String newShowItemId = event.getNewShowItemId(); System.out.println("MyShowListener " + "[oldShowItemId=" + oldShowItemId + "," + "newShowItemId=" + newShowItemId + "]"); } } This listener MyShowListener implements the ShowListener interface and takes an instance of ShowEvent as an argument, and it gets the IDs of the new and old items used in the deck component from the event instance and prints them to the system log window.

experience="first-time" If an attribute s NextAttribute property is null, the attribute is the last attribute of the element.

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