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I will begin with an example of the first prototype, shown in Listing 5-49. I could just reiterate the same two examples I use for the Count operator, changing the relevant parts to type long, but that wouldn t be very demonstrative of the operator. Since it isn t feasible for me to have a sequence long enough to require the LongCount operator, I use a standard query operator to generate one. Unfortunately, the generation operators I cover in the previous chapter only allow you to specify the number of elements to generate using an int. I have to concatenate a couple of those generated sequences together to get enough elements to require the LongCount operator. Listing 5-49. The First LongCount Prototype long count = Enumerable.Range(0, int.MaxValue). Concat(Enumerable.Range(0, int.MaxValue)).LongCount(); Console.WriteLine(count); As you can see, I generated two sequences using the Range operator I cover in the previous chapter and concatenated them together using the Concat operator also covered in the previous chapter.

public class EmployeeOptionEntry { public int id; public long optionsCount; public DateTime dateAwarded; public static EmployeeOptionEntry[] GetEmployeeOptionEntries() { EmployeeOptionEntry[] empOptions = new EmployeeOptionEntry[] { new EmployeeOptionEntry { id = 1, optionsCount = 2, dateAwarded = DateTime.Parse("1999/12/31") }, new EmployeeOptionEntry { id = 2, optionsCount = 10000,

dateAwarded = DateTime.Parse("1992/06/30") new EmployeeOptionEntry { id = 2, optionsCount = 10000, dateAwarded = DateTime.Parse("1994/01/01") new EmployeeOptionEntry { id = 3, optionsCount = 5000, dateAwarded = DateTime.Parse("1997/09/30") new EmployeeOptionEntry { id = 2, optionsCount = 10000, dateAwarded = DateTime.Parse("2003/04/01") new EmployeeOptionEntry { id = 3, optionsCount = 7500, dateAwarded = DateTime.Parse("1998/09/30") new EmployeeOptionEntry { id = 3, optionsCount = 7500, dateAwarded = DateTime.Parse("1998/09/30") new EmployeeOptionEntry { id = 4, optionsCount = 1500, dateAwarded = DateTime.Parse("1997/12/31") new EmployeeOptionEntry { id = 101, optionsCount = 2, dateAwarded = DateTime.Parse("1998/12/31") }; return (empOptions); } }

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This example takes a long time to run. On my machine, a P4 with 1GB of memory, it took approximately two and a half minutes.

You can build your own reusable component in many ways, but for JSF the most common approach is to locate a component that already has the behavior you need and expand upon it. So, what type of behavior is required of the component you will build in this chapter For example, is it for inputting values, selecting one value, selecting many values, or navigating Well, you ll build a component that can take a value, process that value, and then push it back to the underlying model as a strongly typed Date object. The component should allow an application developer to attach a converter in order to set the desired date format (such as mm/dd/yyyy) for which the end user has to comply. Basically, you ll build a simple input component that can convert and validate the date entered by users.

Several of the operators will accept classes that implement the IEqualityComparer<T> interface for the purpose of comparing elements to determine whether they are equal. This is useful for those times when two values may not exactly be equal but you want them to be deemed equal. For example, you may want to be able to ignore case when comparing two strings. However, for this situation, an equality comparison class already exists in the .NET Framework. Since we covered the IEqualityComparer<T> interface in detail in the previous chapter, we will not explain it here. For our examples, we want an equality comparison class that will know how to check for the equality of numbers in string format. So for example, the strings "17" and "00017" would be considered equal. Here is our MyStringifiedNumberComparer class that does just that:

Before you run that example, let me warn you that it takes a long time to run. Don t be surprised if it takes several minutes. After all, it has to generate two sequences, each with 2,147,483,647 elements. Here are the results:

public class MyStringifiedNumberComparer : IEqualityComparer<string> { public bool Equals(string x, string y) { return(Int32.Parse(x) == Int32.Parse(y)); } public int GetHashCode(string obj) { return Int32.Parse(obj).ToString().GetHashCode(); } } Notice that this implementation of the IEqualityComparer interface will work only for variables of type string, but that will suffice for this example. Basically, for all comparisons, we just convert all the values from string to Int32. This way, "002" gets converted to an integer with a value of 2, so leading zeros do not affect the key value. For some of the examples in this chapter, we need a class that could have records with nonunique keys. For this purpose, we have created the Actor class here. We will use the birthYear member as the key specifically for this purpose.

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