generate barcode c# Part III Writing Proper Games in Visual Studio .NET

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Part III Writing Proper Games
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The statement is intended to create a DateTime variable, but the name has not been typed correctly. When the program is compiled, this statement produces the following compilation error:
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Error 1 The type or namespace name 'dateTime' could not be found (are you missing a using directive or an assembly reference )
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The compiler is saying that it can t find anything called dateTime. It even suggests that you might need to add a using directive to identify the namespace that holds this item. (Of course, in this case it is wrong, in that you have misspelled something, rather than forgotten to tell the compiler where to look for it but at least the compiler is trying to help). As far as programmers are concerned, a namespace is a way they can make sure that when they invent an identifier for an object, it s unique in their namespace and won t be confused with an identically named resource in any other namespace. In fact, the next line of Program.cs sets up a namespace for your solution:
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namespace BreadAndCheese { // Program class in here }
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XNA Game Studio automatically creates a namespace to hold all your classes. The namespace is given the same name as the solution. If other C# programmers want to refer to the Game1 class that is in your namespace, they could insert using BreadAndCheese at the top of their program source files. If you use two namespaces that contain a class with identical names, the compiler asks you to use the fully qualified form of the name, as in this example:
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BreadAndCheese.Game1 myGame = new BreadAndCheese.Game1();
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A fully qualified name includes the namespace in which the object is declared, followed by the name of the class required. A namespace can contain other namespaces, so programmers can build a tree of namespaces that can be used to hold different categories of resources. The designers of XNA have created several namespaces that describe resources you ve used in your programs. The using directives at the top of Game1.cs include the following:
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using using using using using using using using using using using System; System.Collections.Generic; System.Linq; Microsoft.Xna.Framework; Microsoft.Xna.Framework.Audio; Microsoft.Xna.Framework.Content; Microsoft.Xna.Framework.GamerServices; Microsoft.Xna.Framework.Graphics; Microsoft.Xna.Framework.Input; Microsoft.Xna.Framework.Input.Touch; Microsoft.Xna.Framework.Media;
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11 A Game as a C# Program
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The features of XNA that you ve used are described in appropriate namespaces; for example, the Texture2D class is described in the Microsoft.XNA.Graphics namespace. Note It s mportant to remember that the namespace nformat on s used by the comp er to dent fy
the resources that are to be used The resources themse ves are oaded and used when the program runs and your so ut on must have a reference to them A so ut on conta ns a st of references that t s us ng; you can see the References fo der n F gure 11-2, just above the Content fo der
You d create namespaces of your own if you wanted to use some classes in more than one solution. For example, you might create some classes that deal with high scores in a game. For this, you might create a HighScores namespace that stores and displays a high-score table.
Static Classes and Methods
The next line in Program.cs describes a class called Program:
static class Program { // content of the class goes here }
The class has been made static. You haven t seen the word static before, but it means always there. In the programs you ve written up until now, you ve had to create instances of classes using new. When a class is made static, it means that there s always one and only one instance of that class present when the program is running. When a C# program starts up, before the code that you ve written is given control, any static classes are created automatically. This means that there s no need to ever create an instance of the Program class by using new because it s always there when your program starts. The next line of the program declares a method called Main in the Program class:
static void Main(string[] args) { // content of the Main method goes here }
The Main method has also been made static. This is because it must exist before your program begins to run. When you run a C# program, the operating system loads the program file into memory, creates all the static classes, and then finds and calls the Main method. One and only one of the classes in a program must contain a Main method so that the operating system knows where to start. Imagine you misspell the name of the method, for example you write the following:
static void main(string[] args) { // content of the Main method goes here }
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