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What determines whether an operator s lambda expression gets compiled into IL code or an expression tree The operator s prototype will define which of these actions the compiler will take If the operator is declared to accept a method delegate, IL code will be emitted If the operator is declared to accept an expression of a method delegate, an expression tree is emitted As an example, let s look at two different implementations of the Where operator The first is the Standard Query Operator that exists in the LINQ to Objects API, which is defined in the SystemLinqEnumerable class:.

First we will try the case of an empty sequence, as shown in Listing 5-37. We will use the Empty operator we covered in the previous chapter.

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public static IEnumerable<T> Where<T>( this IEnumerable<T> source, Func<T, bool> predicate); The second Where operator implementation exists in the LINQ to SQL API and is in the System.Linq.Queryable class: public static IQueryable<T> Where<T>( this IQueryable<T> source, System.Linq.Expressions.Expression<Func<int, bool>> predicate); As you can see, the first Where operator is declared to accept a method delegate, as specified by the Func delegate, and the compiler will generate IL code for this operator s lambda expression. I will cover the Func delegate in 3. For now just be aware that it is defining the signature of the delegate passed as the predicate argument. The second Where operator is declared to accept an expression tree (Expression), so the compiler will generate an expression tree data representation of the lambda expression. The operators that accept an IEnumerable<T> sequence as their first argument are declared to accept a method delegate for their lambda expressions. The operators that accept an IQueryable<T> sequence as their first argument are declared to accept an expression tree.

bool any = Enumerable.Empty<string>().Any(); Console.WriteLine(any); Here are the results of this code: False Next we will try the same prototype but, this time, with elements in the input sequence, as shown in Listing 5-38.

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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"}; bool any = presidents.Any(); Console.WriteLine(any); Here are the results of this code: True For the next example, we use the second prototype, first with no elements matching the predicate, as shown in Listing 5-39.

Unfortunately, exactly how the values get converted is not specified, but it appears that the conversion methods in the System.Xml.XmlConvert class are used for this purpose. Listing 7-12 demonstrates that this is the case when casting as a bool. Listing 7-12. Casting to a Bool Calls the System.Xml.XmlConvert.ToBoolean Method try { XElement smoker = new XElement("Smoker", "Tue"); Console.WriteLine(smoker); Console.WriteLine((bool)smoker); } catch (Exception ex) { Console.WriteLine(ex); } Notice that I intentionally misspell "True" above to force an exception in the conversion hoping for a clue to be revealed in the exception that is thrown. Will I be so lucky Let s press Ctrl+F5 to find out. <Smoker>Tue</Smoker> System.FormatException: The string 'tue' is not a valid Boolean value. at System.Xml.XmlConvert.ToBoolean(String s) ... As you can see, the exception occurred in the call to the System.Xml.XmlConvert.ToBoolean method.

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",

With the new LINQ to XML API comes a new object model containing many new classes that exist in the System.Xml.Linq namespace. One is the static class where the LINQ to XML extension methods live, Extensions; two are comparer classes, XNodeDocumentOrderComparer and XNodeEqualityComparer, and the remaining are used to build your XML trees. Those remaining classes are displayed in the diagram shown in Figure 7-1.

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