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Two-tier, or client-server, solutions took center stage in the 1980s and pushed one-tier solutions into the history archives. A two-tier architecture, which enables sharing data, changed the way applications were developed and deployed. Two-tier applications directly interact with the end user; business and presentation logic are stored on the client, and data resides on a remote server. This architecture allows multiple users to access centralized data with applications such as desktop email clients (such as Microsoft Outlook or Mozilla Thunderbird). Although the two-tier solution solves the issue of having multiple users accessing the same data source, it also has its limitations, such as the lack of flexibility of the design to later modification or porting, which in turn increases maintenance costs.

ArgumentNullException is thrown if the source, keySelector, or elementSelector argument is null or if a key returned by keySelector is null. ArgumentException is thrown if a keySelector returns the same key for two elements.

ArgumentNullException is thrown if any argument is null. InvalidOperationException is thrown if the source sequence is empty for the Numeric versions of the prototypes if the type T is non-nullable, such as int, long, double, or decimal. If the types are nullable, such as int , long , double , decimal , a null is returned from the operator instead.

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In this example, instead of using the typical presidents array we have been using, we use our common Employee class. We are going to create a dictionary of type Dictionary<int, Employee> where the key of type int is the id member of the Employee class and the Employee object itself is the element stored. Listing 5-3 is an example calling the ToDictionary operator using the Employee class.

As an example of the first Max prototype, shown in Listing 5-57, I declare an array of integers and return the maximum from it.

The next phase in application development arrived with the Internet and the Web browser and introduced the three-tier, or multitier, architecture. In the one-tier solution, presentation, business logic, and data are all integrated in one monolithic application. The multitier architecture breaks this type of application into three layers, allowing developers to focus on specific domain areas model (data access), view (presentation), and controller (logic). This programming paradigm, representing the split between these layers, is known as the ModelView-Controller (MVC) architecture and was first introduced in SmallTalk and spread to the developer community in the 1980s. Splitting the one-tier application into layers in combination with a standard client (for example, the Web browser) and a standard communication protocol (for example, Hypertext Transfer Protocol [HTTP]) suddenly gave users ubiquitous access to centralized and familiar applications such as email via a browser (for example, Google s browser-based Gmail). Applications are no longer something that only come on a CD or are downloaded. A multitier solution gives the application owner centralized maintenance and administration, which allows the application owner to provide instantaneous upgrades for everyone using the application.

Dictionary<int, Employee> eDictionary = Employee.GetEmployeesArray().ToDictionary(k => k.id); Employee e = eDictionary[2]; Console.WriteLine("Employee whose id == 2 is {0} {1}", e.firstName, e.lastName); We declare our Dictionary to have a key type of integer because we will be using the Employee.id field as the key. Since this ToDictionary operator prototype only allows us to store the entire input element, which is an Employee object, as the element in the Dictionary, the Dictionary element type is Employee as well. The Dictionary<int, Employee> then allows me to look up employees by their employee id providing the performance efficiencies and retrieval convenience of a Dictionary. Here are the results of the previous code:

Listing 5-57. An Example of the First Max Prototype int[] myInts = new int[] { 974, 2, 7, 1374, 27, 54 }; int maxInt = myInts.Max(); Console.WriteLine(maxInt); The results are the following:

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