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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);

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:

<property name="uwrBusinessService" ref="uwrBusinessServiceProxy" /> <property name="formView" value="createPolicy" /> <property name="commandName" value="policydetails" /> <property name="successView" value="policydetails" /> <property name="commandClass" value="com.apress.insuranceapp.web.formbean.PolicyFormBean" /> </bean> </beans>

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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:

All errors and events are handled by the <catch> element. The <catch> element allows you to perform actions after a certain event. It has three attributes: event, count, and cond. All of the attributes are optional. If you do not specify any attributes, all errors and events will be handled by the one <catch> element. The following example will play the prompt An error or event has occurred for every event or error. <form id="login" scope="dialog"> <field name="accountNumber" type="digits"> <prompt>Please enter your account number</prompt> </field> <field name="accountPin" type="digits"> <prompt>Please enter your PIN code</prompt> </field> <catch> <prompt>An error or event has occurred.</prompt> </catch> </form> This code works but it isn t very practical. Generally, you should catch only events that you can handle. For example, you might want to catch if the user s input did not match a grammar or if the user remained silent past the duration of the specified timeout. You can specify which event or events you wish to catch via the event attribute. You could use the following code to catch the nomatch and noinput events. <form id="login"> <field name="accountNumber" type="digits"> <prompt>Please enter your account number</prompt> </field> <field name="accountPin" type="digits"> <prompt>Please enter your PIN code</prompt> </field> <catch event="noinput nomatch"> <prompt>You did not provide the correct expected input</prompt> </catch> </form> VoiceXML also includes several built-in events and errors, as listed in Table 5-2.

For the second FirstOrDefault prototype, I specify that I want the first element that starts with the string "B", as shown in Listing 5-20. Listing 5-20. Calling the Second 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(p => p.StartsWith("B")); Console.WriteLine(name == null "NULL" : name); Here are the results:

Buchanan Now I will try that with a predicate that will not find a match, as shown in Listing 5-21. Listing 5-21. Calling the Second 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"};

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