Chapter 2 discusses
the reasons for
introducing namespaces into the C# language (e.g., avoiding name
collisions when using libraries from multiple vendors). In addition
to using the namespaces provided by the .NET Framework or other
vendors, you are free to create your own. You do this by using the
namespace
keyword, followed by the name you wish
to create. Enclose the objects for that namespace within braces, as
illustrated in Example 3-19.
Example 3-19. Creating namespaces
namespace Programming_C_Sharp { using System; public class Tester { public static int Main( ) { for (int i=0;i<10;i++) { Console.WriteLine("i: {0}",i); } return 0; } } }
Example 3-19 creates a namespace called
Programming_C_Sharp
, and also specifies a
Tester
class which lives within that namespace.
You can alternatively choose to nest your namespaces, as needed, by
declaring one within another. You might do so to segment your code,
creating objects within a nested namespace whose names are protected
from the outer namespace, as illustrated in Example 3-20.
Example 3-20. Nesting namespaces
namespace Programming_C_Sharp { namespace Programming_C_Sharp_Test { using System; public class Tester { public static int Main( ) { for (int i=0;i<10;i++) { Console.WriteLine("i: {0}",i); } return 0; } } } }
The Tester
object now declared within the
Programming_C_Sharp_Test
namespace is:
Programming_C_Sharp.Programming_C_Sharp_Test.Tester
This name would not conflict with another Tester
object in any other namespace, including the outer namespace
Programming_C_Sharp
.
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