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With the introduction of generics in C# 2.0, C# developers now have a way to explicitly state that a collection can only contain elements of a specified type. While either the OfType or Cast operator may work for a legacy collection, Cast requires that every object in the collection be of the correct type, which is the fundamental original flaw in the legacy collections for which generics were created. When using the Cast operator, if any object is unable to be cast to the specified data type, an exception is thrown. Instead, use the OfType operator. With it, only objects of the specified type will be stored in the output IEnumerable<T> sequence, and no exception will be thrown. The best-case scenario is that every object will be of the correct type and be in the output sequence. The worst case is that some elements will get skipped, but they would have thrown an exception had the Cast operator been used instead.

For an example demonstrating the ToArray operator, we need a sequence of type IEnumerable<T>. We will create a sequence of that type by calling the OfType operator, which we covered in the previous chapter, on an array. Once we have that sequence, we can call the ToArray operator to create an array, as shown in Listing 5-1.

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", "Obama", "Pierce", "Polk", "Reagan", "Roosevelt", "Taft", "Taylor", "Truman", "Tyler", "Van Buren", "Washington", "Wilson"};

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In 3, I discuss that LINQ queries are often deferred and not actually executed when it appears you are calling them For example, consider this code fragment from Listing 1-1: var items = from s in greetings where sEndsWith("LINQ") select s; foreach (var item in items) ConsoleWriteLine(item); While it appears the query is occurring when the items variable is being initialized, that is not the case Because the Where and Select operators are deferred, the query is not actually being performed at that point The query is merely being called, declared, or defined, but not performed The query will actually take place the first time a result from it is needed This is typically when the query results variable is enumerated In this example, a result from the query is not needed until the foreach statement is executed.

string[] names = presidents.OfType<string>().ToArray(); foreach (string name in names) Console.WriteLine(name); First we convert the presidents array to a sequence of type IEnumerable<string> using the OfType operator. Then we convert that sequence to an array using the ToArray operator. Since the ToArray is a nondeferred operator, the query is performed immediately, even prior to enumerating it. Here is the output when running the previous code: 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 Obama Pierce Polk Reagan Roosevelt Taft Taylor Truman Tyler

The encodeEnd() method of the renderer for UIForm must call ViewHandlerwriteState() before writing out the markup for the closing tag of the form This allows the state for multiple forms to be saved UIGraphic (extends UIComponentBase) is a component that displays a graphical image to the user The user cannot manipulate this component; it is for display purposes only UIInput (extends UIOutput, implements EditableValueHolder) is a component that both displays the current value of the component to the user (as UIOutput components do) and processes request parameters on the subsequent request that needs to be decoded UIMessage (extends UIComponentBase) encapsulates the rendering of error message(s) related to a specified input component UIMessage (extends UIComponentBase) encapsulates the rendering of error message(s) not related to a specified input component or all queued messages.

That is the point in time that the query will be performed In this way, we say that the query is deferred It is often easy to forget that many of the query operators are deferred and will not execute until a sequence is enumerated This means you could have an improperly written query that will throw an exception when the resulting sequence is eventually enumerated That enumeration could take place far enough downstream that it is easily forgotten that a query may be the culprit Let s examine the code in Listing 1-11 Listing 1-11 Query with Intentional Exception Deferred Until Enumeration string[] strings = { "one", "two", null, "three" }; ConsoleWriteLine("Before Where() is called"); IEnumerable<string> ieStrings = stringsWhere(s => sLength == 3); ConsoleWriteLine("After Where() is called"); foreach(string s in ieStrings) { Console.

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