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Figure 10-10. Nested namespace structure
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CHAPTER 10 NAMESPACES AND ASSEMBLIES
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The using Directives
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Fully qualified names can be quite long, and using them throughout your code can become quite tedious. There are two compiler directives, however, that allow you to avoid having to use fully qualified names the using namespace directive and the using alias directive. Two important points about the using directives are the following: They must be placed at the top of the source file, before any type declarations. They apply for all the namespaces in the current source file.
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The using Namespace Directive
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You saw in the MyWidgets example several sections back that you can specify a class by using the fully qualified name. You can avoid having to use the long name by placing using namespace directives at the top of the source file. The using namespace directive instructs the compiler that you will be using types from certain specific namespaces. You can then go ahead and use the simple class names without having to fully qualify them. When the compiler encounters a name that is not in the current namespace, it checks the list of namespaces given in the using namespace directives and appends the unknown name to the first namespace in the list. If the resulting fully qualified name matches a class in this assembly or a referenced assembly, the compiler uses that class. If it does not match, it tries the next namespace in the list. The using namespace directive consists of the keyword using, followed by a namespace identifier. Keyword using System ; Name of namespace One method I have been using throughout the text is the WriteLine method, which is a member of class Console, in the System namespace. Rather than use its fully qualified name throughout the code, I simplified our work just a bit, by the use of the using namespace directive at the top of the code. For example, the following code uses the using namespace directive in the first line to state that the code uses classes or other types from the System namespace. using System; ... System.Console.WriteLine("This is text 1"); Console.WriteLine("This is text 2"); // using namespace directive // Use fully qualified name // Use directive
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CHAPTER 10 NAMESPACES AND ASSEMBLIES
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The using Alias Directive
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The using alias directive allows you to assign an alias for either of the following: A namespace A type in a namespace For example, the following code shows the use of two using alias directives. The first directive instructs the compiler that identifier Syst is an alias for namespace System. The second directive says that identifier SC is an alias for class System.Console. Keyword Alias Namespace using Syst = System; using SC = System.Console; Keyword Alias Class The following code uses these aliases. All three lines of code in Main call the System.Console.WriteLine method. The first statement in Main uses the alias for a namespace System. The second statement uses the fully qualified name of the method. The third statement uses the alias for a class Console. using Syst = System; using SC = System.Console; // using alias directive // using alias directive
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namespace MyNamespace { class SomeClass { static void Main() { Alias for namespace Syst.Console.WriteLine ("Using the namespace alias."); System.Console.WriteLine("Using fully qualified name."); SC.WriteLine ("Using the type alias"); } Alias for class } }
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CHAPTER 10 NAMESPACES AND ASSEMBLIES
The Structure of an Assembly
As you saw in 1, an assembly does not contain native machine code, but Common Intermediate Language (CIL) code. It also contains everything needed by the Just-in-Time (JIT) compiler to convert the CIL into native code at run time, including references to other assemblies it references. The file extension for an assembly is generally .exe or .dll. Most assemblies are composed of a single file. Figure 10-11 illustrates the four main sections of an assembly. The assembly manifest contains the following: The identity of the assembly name A list of the files that make up the assembly A map of where things are in the assembly Information about other assemblies that are referenced The type metadata section contains the information about all the types defined in the assembly. This information contains everything there is to know about each type. The CIL section contains all the intermediate code for the assembly. The resources section is optional, but can contain graphics or language resources.
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