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// Execute the query and display the results foreach(var t in byHow) { ConsoleWriteLine("{0} transportation includes:", tHow);
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PART I
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foreach(var m in tTlist) ConsoleWriteLine(" " + mName); ConsoleWriteLine(); } } }
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The output is shown here:
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Air transportation includes: Balloon Jet Biplane Sea transportation includes: Boat Canoe Cargo Ship Land transportation includes: Bicycle Car Train
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The key part of the program is, of course, the query, which is shown here:
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var byHow = from how in travelTypes join trans in transports on how equals transHow into lst select new { How = how, Tlist = lst };
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Here is how it works The from statement uses how to range over the travelTypes array Recall that travelTypes contains an array of the general travel classifications: air, land, and sea The join clause joins each travel type with those transports that use that type For example, the type Land is joined with Bicycle, Car, and Train However, because of the into clause, for each travel type, the join produces a list of the transports that use that travel type This list is represented by lst Finally, select returns an anonymous type that encapsulates each value of how (the travel type) with a list of transports This is why the two foreach loops shown here are needed to display the results of the query:
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foreach(var t in byHow) { ConsoleWriteLine("{0} transportation includes:", tHow); foreach(var m in tTlist) ConsoleWriteLine(" " + mName); ConsoleWriteLine(); }
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Part I:
The C# Language
The outer loop obtains an object that contains the name of the travel type and the list of the transports for that type The inner loop displays the individual transports
The Query Methods
The query syntax described by the preceding sections is the way you will probably write most queries in C# It is convenient, powerful, and compact It is, however, not the only way to write a query The other way is to use the query methods These methods can be called on any enumerable object, such as an array
The Basic Query Methods
The query methods are defined by SystemLinqEnumerable and are implemented as extension methods that extend the functionality of IEnumerable<T> (Query methods are also defined by SystemLinqQueryable, which extends the functionality of IQueryable<T>, but this interface is not used in this chapter) An extension method adds functionality to another class, but without the use of inheritance Support for extension methods is relatively new, being added by C# 30, and we will look more closely at them later in this chapter For now, it is sufficient to understand that query methods can be called only on an object that implements IEnumerable<T> The Enumerable class provides many query methods, but at the core are those that correspond to the query keywords described earlier These methods are shown here, along with the keywords to which they relate Understand that these methods have overloaded forms and only their simplest form is shown However, this is also the form that you will often use
Query Keyword select where orderby join group Equivalent Query Method Select(selector) Where(predicate) OrderBy(keySelector) or OrderByDescending(keySelector) Join(inner, outerKeySelector, innerKeySelector, resultSelector) GroupBy(keySelector)
Except for Join( ), these query methods take one argument, which is an object of some form of the generic type Func<T, TResult> This is a built-in delegate type that is declared like this: delegate TResult Func<in T, out TResult>(T arg) Here, TResult specifies the result type of the delegate and T specifies the element type In these query methods, the selector, predicate, or keySelector argument determines what action the query method takes For example, in the case of Where( ), it determines how the query filters the data Each of these query methods returns an enumerable object Thus, the result of one can be used to execute a call on another, allowing the methods to be chained together The Join( ) method takes four arguments The first is a reference to the second sequence to be joined The first sequence is the one on which Join( ) is called The key selector for the
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