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As mentioned in the earlier section Converters, Validators, Events, and Listeners, you have two methods that will be processed when an ActionEvent occurs. The first thing that happens is a call to the processApplication() method on the UIViewRoot that takes each queued event and broadcasts to the target component for the event (for example, commandButton.broadcast(FacesEvent)). The UICommand component knows about the action and actionListener attributes, as well as the default ActionListener attached to the Application object. First all previously registered ActionListeners are called, then the actionListener method binding is executed (for example, #{credentials.onLogin}), and finally the component calls the processAction() method on the default ActionListener to process the action method binding and handle navigation. It is important that the action method binding is called at the end of this process, since it defines possible navigation, and you don t want to navigate before you have processed all events. Postback with Navigation When the default ActionListener is processing an ActionEvent, it invokes the action method binding and gets the outcome, which is a String object. If the outcome returns null, then the default ActionListener will continue with the next queued event. After all events have been broadcast, the Invoke Application phase is complete and lifecycle processing continues to the last phase Render Response. If the outcome is not null, then the default ActionListener passes FacesContext, fromAction (which is the method-binding expression text for example, credentials.doLogin), and outcome to the NavigationHandler. Figure 1-22 shows navigation on postback.

Listing 5-37. First Any Prototype Where No Elements Are in the Source Input Sequence bool any = Enumerable.Empty<string>().Any(); Console.WriteLine(any); Here are the results of this code:

Hanari Carnes Que Del cia Ricardo Adocicados For that example to work, you must add the System.Data.Linq.dll assembly to your project, add a using directive for the nwind namespace, and add the generated entity classes that we will cover in the LINQ to SQL chapters to your project. Additionally, you may need to tweak the connection string. Let s assume that we need to reverse the order of the records coming from the database for some reason. We are not concerned because we know there is a Reverse operator that we covered earlier in this chapter. Listing 4-40 shows the previous example modified to call the Reverse operator.

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Next I will try the same prototype but, this time, with elements in the input sequence, as shown in Listing 5-38. Listing 5-38. First Any Prototype Where Elements Are in the Source Input Sequence string[] presidents = { "Adams", "Arthur", "Buchanan", "Bush", "Carter", "Cleveland", "Clinton", "Coolidge", "Eisenhower", "Fillmore", "Ford", "Garfield", "Grant", "Harding", "Harrison", "Hayes", "Hoover", "Jackson", "Jefferson", "Johnson", "Kennedy", "Lincoln", "Madison", "McKinley", "Monroe", "Nixon", "Pierce", "Polk", "Reagan", "Roosevelt", "Taft", "Taylor", "Truman", "Tyler", "Van Buren", "Washington", "Wilson"}; bool any = presidents.Any(); Console.WriteLine(any); Here are the results of this code:

Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); var custs = (from c in db.Customers where c.City == "Rio de Janeiro" select c) .Reverse(); foreach (var cust in custs) Console.WriteLine("{0}", cust.CompanyName); It seems simple enough. As you can see, our only change is to add the call to the Reverse method. The code compiles just fine. Here are the results of the example: Unhandled Exception: System.NotSupportedException: The query operator 'Reverse' is not supported. Boy, that seemed like it should have been so simple; what happened What happened is that there is no Reverse method for the IQueryable<T> interface, so the exception was thrown. We need to use the AsEnumerable method to convert the sequence of type IQueryable<T> to a sequence of type IEnumerable<T> so that when we call the Reverse method, the IEnumerable<T> Reverse method gets called. The code modified to do this is in Listing 4-41.

Navigation rules are defined in faces-config.xml, which is read at start-up, and all information is stored in the Application object (see the section Navigation Model ). The first thing the NavigationHandler does is to check for a navigation rule that matches the combination of fromViewId (which it will get from the FacesContext), fromAction, and outcome. You can handle navigation in two ways. Redirecting means a new request (and as a bonus you can bookmark the new page) and starts the JSF request lifecycle all over again; you can also have the handleNavigation() method create a new UIViewRoot, set the new UIViewRoot on the FacesContext, and let the default ActionListener call renderResponse() to initiate the Render Response phase. This solution is replicating the behavior of the initial request in the Render Response phase but with a new view identifier. Figure 1-23 shows the JSP execution during postback.

Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); var custs = (from c in db.Customers where c.City == "Rio de Janeiro"

True For the next example, I use the second prototype, first with no elements matching the predicate, as shown in Listing 5-39. Listing 5-39. Second Any Prototype Where No Elements Cause the Predicate to Return True string[] presidents = { "Adams", "Arthur", "Buchanan", "Bush", "Carter", "Cleveland", "Clinton", "Coolidge", "Eisenhower", "Fillmore", "Ford", "Garfield", "Grant", "Harding", "Harrison", "Hayes", "Hoover", "Jackson", "Jefferson", "Johnson", "Kennedy", "Lincoln", "Madison", "McKinley", "Monroe", "Nixon", "Pierce", "Polk", "Reagan", "Roosevelt", "Taft", "Taylor", "Truman", "Tyler", "Van Buren", "Washington", "Wilson"}; bool any = presidents.Any(s => s.StartsWith("Z")); Console.WriteLine(any); I specify that I want the presidents that start with the string "Z". Since there are none, an empty sequence will be returned causing the Any operator to return false. The results are as one would expect:

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