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Func<T, K> keySelector, Func<T, E> elementSelector); This prototype of the GroupBy operator is just like the first except instead of the entire source element being the element in the output IGrouping sequence for its key, you may specify which part of the input element is output with the elementSelector.

There are two prototypes I cover. The First FirstOrDefault Prototype public static T FirstOrDefault<T>( this IEnumerable<T> source); This version of the FirstOrDefault prototype returns the first element found in the input sequence. If the sequence is empty, default(T) is returned. For reference and nullable types, the default value is null. The second prototype of the FirstOrDefault operator allows you to pass a predicate to determine which element should be returned. The Second FirstOrDefault Prototype public static T FirstOrDefault<T>( this IEnumerable<T> source, Func<T, bool> predicate);

public static IEnumerable<IGrouping<K, E>> GroupBy<T, K, E>( this IEnumerable<T> source, Func<T, K> keySelector, Func<T, E> elementSelector, IEqualityComparer<K> comparer); This prototype of the GroupBy operator is a combination of the second and third so that you may specify a comparer with the comparer argument, and you may output elements of a different type than the input element type using the elementSelector argument.

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In Code Sample 10-4, you are testing the User-Agent request header directly against known user agent identifiers to decide which RenderKit is appropriate to use in the response. Notice that some of the syntax for user agents can overlap, such as Mozilla appearing in the user agent header for Firefox, Internet Explorer, and Safari. Given the complexity of accurately parsing the wide range of possible User-Agent headers, it is best to reuse a common implementation rather than repeating the agent detection code each time it is needed. Oracle ADF Faces provides a User-Agent abstraction to handle this case, and in Code Sample 10-5 we have simplified the ApplicationBean by leveraging some of the Oracle ADF Faces public APIs to obtain the user agent. Code Sample 10-5. The getRenderKitId() Method package com.apress.projsf.ch10.application; import javax.faces.render.RenderKitFactory; import oracle.adf.view.faces.context.AdfFacesContext; import oracle.adf.view.faces.context.Agent; /** * The ApplicationBean returns a dynamic RenderKit identifier, based on * the ADF Faces Agent name. */ public class ApplicationBean { public String getRenderKitId() { AdfFacesContext afc = AdfFacesContext.getCurrentInstance(); Agent agent = afc.getAgent(); if (Agent.AGENT_GECKO.equals(agent.getAgentName())) { return "com.apress.projsf.xul.ajax"; } else if (Agent.AGENT_IE.equals(agent.getAgentName()) && Agent.TYPE_DESKTOP.equals(agent.getType())) { return "com.apress.projsf.htc.ajax"; } else if (Agent.AGENT_WEBKIT.equals(agent.getAgentName())) { return "com.apress.projsf.html.ajax"; } else { // default to standard HTML Basic for PDAs, etc.

Listing 5-18 is an example of the first FirstOrDefault prototype where no element is found. I have to get an empty sequence to do this. I ll call Take(0) for this purpose. Listing 5-18. Calling the First FirstOrDefault Prototype Where an Element Is Not Found 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"}; string name = presidents.Take(0).FirstOrDefault(); Console.WriteLine(name == null "NULL" : name); Here are the results:

For our example of the first GroupBy prototype, we will use the common EmployeeOptionEntry class. In this example, in Listing 4-30, we are going to group our EmployeeOptionEntry records by id and display them.

EmployeeOptionEntry[] empOptions = EmployeeOptionEntry.GetEmployeeOptionEntries(); IEnumerable<IGrouping<int, EmployeeOptionEntry>> outerSequence = empOptions.GroupBy(o => o.id); // First enumerate through the outer sequence of IGroupings. foreach (IGrouping<int, EmployeeOptionEntry> keyGroupSequence in outerSequence) { Console.WriteLine("Option records for employee: " + keyGroupSequence.Key); // Now enumerate through the grouping's sequence of EmployeeOptionEntry elements. foreach (EmployeeOptionEntry element in keyGroupSequence) Console.WriteLine("id={0} : optionsCount={1} : dateAwarded={2:d}", element.id, element.optionsCount, element.dateAwarded); }

Listing 5-19 is the same example without the Take(0) call, so an element is found. Listing 5-19. Calling the First FirstOrDefault Prototype Where an Element Is Found 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"}; string name = presidents.FirstOrDefault(); Console.WriteLine(name == null "NULL" : name); And finally, here are the results for the code when I find an element:

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