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The doStartTag() method, as shown in Code Sample 3-36, is part of the contract with the TagSupport class and is invoked by the JSP page implementation when all properties have been set. Code Sample 3-36. The doStartTag() Method public int doStartTag() throws JspException { UIComponentTag tag = UIComponentTag.getParentUIComponentTag(pageContext); if (tag == null) throw new JspException("Not inside UIComponentTag"); if (tag.getCreated()) { UIComponent component = tag.getComponentInstance(); if (component == null) throw new JspException("Component instance is null"); String className = _type; if (UIComponentTag.isValueReference(_type)) { FacesContext context = FacesContext.getCurrentInstance(); Application application = context.getApplication(); ValueBinding vb = application.createValueBinding(_type); className = (String)vb.getValue(context); } ShowListener listener = createShowListener(className);

XAttribute.Remove()

To use the LINQ to SQL API, you will need to add the System.Data.Linq.dll assembly to your project if it is not already there. Also, if they do not already exist, you will need to add using directives to your source module for the System.Linq and System.Data.Linq namespaces like this: using System.Data.Linq; using System.Linq; Additionally, for the examples, you will need to add a using directive for the namespace the entity classes were generated into, nwind: using nwind;

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Just like the XNode class has a remove method, so too does the XAttribute class. Listing 7-81 is an example. Listing 7-81. Removing an Attribute // 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 removing attribute:"); Console.WriteLine(xDocument); firstParticipant.Attribute("type").Remove(); Console.WriteLine(System.Environment.NewLine + "After removing attribute:"); Console.WriteLine(xDocument); As you can see, I use the Attribute method to obtain a reference to the attribute I want to remove, and then I call the Remove method on it. Just so you don t think I am just making this all up, here are the results:

You will see that in many of the LINQ to SQL examples in this chapter and the subsequent LINQ to SQL chapters, we work with sequences of type IQueryable<T>, where T is the type of an entity class. These are the type of sequences that are typically returned by LINQ to SQL queries. They will often appear to work just like an IEnumerable<T> sequence, and that is no coincidence. The IQueryable<T> interface extends the IEnumerable<T> interface. Here is the definition of IQueryable<T>: interface IQueryable<T> : IEnumerable<T>, IQueryable Because of this inheritance, you can treat an IQueryable<T> sequence like an IEnumerable<T> sequence.

if (!(component instanceof ShowSource)) throw new JspException("Component is not a ShowSource"); showSource.addShowListener(listener); } return (SKIP_BODY); } In this case, the type property is required, so it is expected to be non-null. You start by retrieving the parent UIComponentTag to the ShowListener custom action using the getParentUIComponentTag() method. This method will return the nearest enclosing UIComponentTag, if any; if no UIComponentTag is available, it will return null.

You will see that the examples in this chapter and the others that deal with LINQ to SQL quickly become complex. Demonstrating a concurrency conflict requires making changes to the database external to LINQ to SQL. To highlight the LINQ to SQL code and to eliminate as many of the trivial details as possible (while at the same time providing useful examples), we have created some common methods. Be sure to add these common methods to your source modules as appropriate when testing the examples in the LINQ to SQL chapters.

Before removing attribute: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> After removing attribute: <BookParticipants> <BookParticipant> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> Notice that the type attribute is now gone.

GetStringFromDb()

IEnumerable<T>.Remove()

A common method that will come in handy is a method to obtain a simple string from the database using standard ADO.NET. This will allow us to examine what is actually in the database, as opposed to what LINQ to SQL is showing us.

s Note The UIComponentTag is an implementation of javax.servlet.jsp.tagext.Tag and must be the base class for any JSP custom action that corresponds to a JSF UIComponent. For more information about the UIComponentTag, please refer to the JSF 1.1 specification.

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