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You cannot create class objects directly from a generic class. First, you need to tell the compiler what actual types should be substituted for the placeholders (the type parameters). The compiler takes those actual types and creates a template from which it creates actual class objects. To construct a class type from a generic class, list the class name and supply real types between the angle brackets, in place of the type parameters. The real types being substituted for the type parameters are called type arguments. Type arguments SomeClass< short, int >

namespace HelloWorld { class Program { static void Main(string[] args) { Console.WriteLine("Hello, world"); } } }

This example is now ready to run. From the Debug menu select the Start Without Debugging item, or just press Ctrl-F5. The program will run, and because you ve written a console application, a console window will open. The first line of this window will contain the text Hello, world and this will be followed by a prompt saying Press any key to continue... Once you ve finished admiring the fruits of your creation, press a key to dismiss the window.

function parent(arg) { var testVariable = "I am a test variable.";

Don t use Debug Start Debugging or F5 this will run the application in Visual Studio s debugging mode, which doesn t keep the window open once the application has finished. That s not helpful for this example, which will most likely run to completion and then close the window before you ve had a chance to see the output.

Now that we have a complete program, let s look at the code to see what each part is for all of the pieces are things you ll deal with every time you write in C#. Starting from the top, Program.cs has several lines beginning with using:

using using using using System; System.Collections.Generic; System.Linq; System.Text;

Variables must be assigned to, before being used as actual parameters (except in the case of output parameters, which I will cover shortly). For reference types, the variable can be assigned either a reference or null. 3 covered value types, which, as you will remember, are types that contain their own data. Don t be confused that I am now talking about value parameters. They are entirely different. Remember that value parameters are parameters where the value of the actual parameter is copied to the formal parameter.

These using directives help the C# compiler work out what external code this particular source file will be using. No code is an island to get any useful work done, your programs will rely on other code. All C# programs depend on the .NET Framework class library, for example: the one line of code we added to our program uses the class library to display a message. Using directives can declare an intent to use classes from any library yours, Microsoft s, or anyone s. All the directives in our example start with System, which indicates that we want to use something from the .NET Framework. This text that follows the using keyword denotes a namespace.

We re going to dive into the guts of the thing here, so feel free to skip this if you re not deeply interested in how this works under the covers. If you do look under the hood at the IL code emitted by the compiler, using a tool such as ildasm, you can see that properties consist of two pieces: the property metadata, and (either or both of) two functions called get_PropName and set_PropName, which actually implement the getter/setter. If you ve chosen to use the simple property syntax, there s also a field created with a name that is something like <PropName>k__BackingField. At the IL level, there s no difference between a property override and a new property declaration. It is the metadata on the getter and setter functions that determines whether they are virtual (and indeed what their accessibility might be). So the fact that we can t override a property that has a getter in the base class with one that has a getter and a setter in the derived class is a feature of the C# language, not the underlying platform.

Well, we could work around that with another member to set the name; but as you can see in Example 4-18, it is all getting a bit ugly.

abstract class FirefighterBase : NamedPerson { public abstract void ExtinguishFire(); public override string Name { get { return RealName;

For example, the following code shows a method called MyMethod, which takes two parameters a variable of type MyClass and an int. The method adds 5 to both the field of the class and the int. You might also notice that MyMethod uses the modifier static, which you haven t seen before. You can ignore it for now. I will talk about static methods in 6. class MyClass { public int Val = 20; }

}

}

function child() { alert(arg + testVariable); }

public string RealName { get; set; } } // ...

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