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At first glance, a component may appear to be a simple class that derives from Sys.Component. Why do you call $create rather than use the new operator to create an instance The answer is that creating an instance isn t enough because a component needs to be initialized and added as a child component of the Application object. The following code shows how to create a new instance of the trivial component:

// Create a customer list with sample data private static List<Customer> CreateCustomerList() { List<Customer> customers = new List<Customer> { new Customer { FirstName = "Orlando", LastName = "Gee", EmailAddress = "orlando0@hotmail.com"}, new Customer { FirstName = "Keith", LastName = "Harris", EmailAddress = "keith0@hotmail.com" }, new Customer { FirstName = "Donna", LastName = "Carreras", EmailAddress = "donna0@hotmail.com" }, new Customer { FirstName = "Janet", LastName = "Gates", EmailAddress = "janet1@hotmail.com" }, new Customer { FirstName = "Lucy", LastName = "Harrington", EmailAddress = "lucy0@hotmail.com" } }; return customers; }

Output: <Customers> <Customer FirstName="Orlando" LastName="Gee"> <EmailAddress>orlando0@hotmail.com</EmailAddress> </Customer>

<Customer FirstName="Keith" LastName="Harris"> <EmailAddress>keith0@hotmail.com</EmailAddress> </Customer> <Customer FirstName="Donna" LastName="Carreras"> <EmailAddress>donna0@hotmail.com</EmailAddress> </Customer> <Customer FirstName="Janet" LastName="Gates"> <EmailAddress>janet1@hotmail.com</EmailAddress> </Customer> <Customer FirstName="Lucy" LastName="Harrington"> <EmailAddress>lucy0@hotmail.com</EmailAddress> </Customer> </Customers>

A console window is a simple command prompt window that allows a program to display text and receive input from the keyboard. The BCL supplies a class called Console (in the System namespace), which contains methods for inputting and outputting data to a console window.

While it s often convenient to be able to create and add elements and attributes one step at a time, these classes offer constructors that allow us to do more work in a single step. If we know exactly what we want to put in an element, this can lead to neater looking code. For example, we can replace the foreach loop with the code in Example 12-4.

foreach (Customer customer in customers) { // Create new element representing the customer object. var customerElem = new XElement("Customer", new XAttribute("FirstName", customer.FirstName), new XAttribute("LastName", customer.LastName), new XElement("EmailAddress", customer.EmailAddress) ); // Finally add the customer element to the XML document rootElem.Add(customerElem);

}

The only difference is that we re passing all the XAttribute and XElement objects to the containing XElement constructor, rather than passing them to Add one at a time. As well as being more compact, it s pretty easy to see how this code relates to the structure of the XML element being produced. We can also use this technique in conjunction with LINQ.

Write is a member of the Console class. It sends a text string to the program s console window. In its simplest form, Write sends a literal string of text to the window. The string must be enclosed in quotation marks. The following line of code shows an example of using the Write member: Console.Write("This is trivial text."); Output string This code produces the following output in the console window:

We ve seen several examples that construct an XElement, passing the name as the first argument, and the content as the second. We ve passed strings, child elements, and attributes, but we can also provide an implementation of IEnumerable<T>. So if we add a using System.Linq; directive to the top of our file, we could use a LINQ query as the second constructor argument as Example 12-5 shows.

var customerXml = new XDocument(new XElement("Customers", from customer in customers select new XElement("Customer", new XAttribute("FirstName", customer.FirstName), new XAttribute("LastName", customer.LastName), new XElement("EmailAddress", customer.EmailAddress) )));

var trivialComponent = new Samples.TrivialComponent(); trivialComponent.set_id('trivialComponent'); trivialComponent.initialize(); Sys.Application.addComponent(trivialComponent);

This generates the whole of the XML document in a single statement. So the work that took 25 lines of code in Example 12-1 comes down to just seven. Example 12-6 shows the whole example, with its much simplified Main method.

using using using using System; System.Collections.Generic; System.Linq; System.Xml.Linq;

As another example, the following code sends three literal strings to the program s console window: System.Console.Write ("This is text1."); System.Console.Write ("This is text2."); System.Console.Write ("This is text3."); This code produces the output that follows. Notice that Write does not append a newline character after the string, so the output of the three statements runs together on a single line. This is text1.This is text2.This is text3. First Second Third statement statement statement

namespace Programming_CSharp { // Simple customer class public class Customer { // Same as in Example 12-1 } // Main program public class Tester { static void Main() { List<Customer> customers = CreateCustomerList(); var customerXml = new XDocument(new XElement("Customers", from customer in customers select new XElement("Customer", new XAttribute("FirstName", customer.FirstName), new XAttribute("LastName", customer.LastName), new XElement("EmailAddress", customer.EmailAddress) ))); Console.WriteLine(customerXml.ToString()); Console.Read();

}

// Create a customer list with sample data private static List<Customer> CreateCustomerList() { List<Customer> customers = new List<Customer> { new Customer { FirstName = "Orlando", LastName = "Gee",

}

WriteLine is another member of Console; it performs the same functions as Write, but appends a newline character to the end of each output string. For example, if you use the preceding code, but use WriteLine instead of Write, the output is on separate lines: System.Console.WriteLine("This is text 1."); System.Console.WriteLine("This is text 2."); System.Console.WriteLine("This is text 3."); This code produces the following output in the console window: This is text 1. This is text 2. This is text 3.

}

}

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