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public static IEnumerable<V> GroupJoin<T, U, K, V>( this IEnumerable<T> outer, IEnumerable<U> inner, Func<T, K> outerKeySelector, Func<U, K> innerKeySelector, Func<T, IEnumerable<U>, V> resultSelector); Notice that the first argument of the method is named outer. Since this is an extension method, the sequence the GroupJoin operator is called on will be referred to as the outer sequence. The GroupJoin operator will return an object that, when enumerated, will first enumerate the inner sequence of type U elements, calling the innerKeySelector method once for each element and storing the element, referenced by its key, in a hash table. Next, the returned object will enumerate the outer sequence of type T elements. As the returned object enumerates each outer sequence element, it will call the outerKeySelector method to obtain its key and retrieve the matching inner sequence elements from the hash table using that key. For each outer sequence element, the returned object will call the resultSelector method, passing both the outer element and a sequence of the matching inner elements so that resultSelector can return an instantiated object of type V, which the returned object will place in the output sequence of type V. The order of the outer sequence elements will be preserved, as will the order of the inner elements within each outer element.

The First operator returns the first element of a sequence, or the first element of a sequence matching a predicate, depending on the prototype used.

Let s look at the actual ApplicationBean class. Figure 10-2 shows the ApplicationBean in a class diagram, and in Code Sample 10-4, you can observe the User-Agent request header for choosing an appropriate RenderKit.

For the GroupJoin example, we will use the same Employee and EmployeeOptionEntry classes that we used in the Join example. Our sample code, which appears in Listing 4-29, will join the employees to the options and calculate a sum of the options for each employee using the GroupJoin operator.

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There are two prototypes I cover. The First First Prototype public static T First<T>( this IEnumerable<T> source); Using this prototype of the First operator enumerates the input sequence named source and returns the first element of the sequence. The second prototype of the First operator allows a predicate to be passed. The Second First Prototype public static T First<T>( this IEnumerable<T> source, Func<T, bool> predicate); This version of the First operator returns the first element it finds for which the predicate returns true. If no elements cause the predicate to return true, the First operator throws an InvalidOperationException.

Employee[] employees = Employee.GetEmployeesArray(); EmployeeOptionEntry[] empOptions = EmployeeOptionEntry.GetEmployeeOptionEntries(); var employeeOptions = employees .GroupJoin( empOptions, e => e.id,

o => o.id, (e, os) => new { id = e.id, name = string.Format("{0} {1}", e.firstName, e.lastName), options = os.Sum(o => o.optionsCount) }); foreach (var item in employeeOptions) Console.WriteLine(item); The preceding code is almost identical to the example for the Join operator. However, if you examine the second input argument of the lambda expression passed as the resultSelector method, you will notice that we called the input argument o in the Join example, but we are calling it os in this example. This is because, in the Join example, a single employee option object, o, is passed in this argument, but in the GroupJoin example, a sequence of employee option objects, os, is being passed. Then, the last member of our instantiated anonymous object is being set to the sum of the sequence of employee option objects optionsCount members using the Sum operator that we will be covering in the next chapter (since it is not a deferred query operator). For now, you just need to understand that the Sum operator has the ability to calculate the sum of each element or a member of each element in an input sequence. This code will provide the following results: { { { { { id id id id id = = = = = 1, name = 2, name = 3, name = 4, name = 101, name Joe Rattz, options = 2 } William Gates, options = 30000 } Anders Hejlsberg, options = 20000 } David Lightman, options = 1500 } = Kevin Flynn, options = 2 }

ArgumentNullException is thrown if any arguments are null. InvalidOperationException is thrown if the source sequence is empty, or if the predicate never returns true.

Code Sample 10-4. The getRenderKitId() Method with User-Agent Request Header package com.apress.projsf.ch10.application; import java.util.Map;

Notice that, in these results, there is one record for each employee containing the sum of all of that employee s option records. Contrast this with the Join operator s example where there was a separate record for each of the employee s option records.

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