vb.net generate barcode image Part II Designing Types in C#.NET

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Part II Designing Types
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using Microsoft; // Try prepending "Microsoft." using Wintellect; // Try prepending "Wintellect." // Define WintellectWidget symbol as an alias to Wintellect.Widget using WintellectWidget = Wintellect.Widget; public sealed class Program { public static void Main() { WintellectWidget w = new WintellectWidget(); // No error now } }
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These methods of disambiguating a type are useful, but in some scenarios, you need to go further . Imagine that the Australian Boomerang Company (ABC) and the Alaskan Boat Corporation (ABC) are each creating a type, called BuyProduct, which they intend to ship in their respective assemblies . It s likely that both companies would create a namespace called ABC that contains a type called BuyProduct . Anyone who tries to develop an application that needs to buy both boomerangs and boats would be in for some trouble unless the programming language provides a way to programmatically distinguish between the assemblies, not just between the namespaces . Fortunately, the C# compiler offers a feature called extern aliases that gives you a way to work around this rarely occurring problem . Extern aliases also give you a way to access a single type from two (or more) different versions of the same assembly . For more information about extern aliases, see the C# Language Specification . In your library, when you re designing types that you expect third parties to use, you should define these types in a namespace so that compilers can easily disambiguate them . In fact, to reduce the likelihood of conflict, you should use your full company name (not an acronym or abbreviation) to be your top-level namespace name . Referring to the Microsoft .NET Framework SDK documentation, you can see that Microsoft uses a namespace of Microsoft for Microsoft-specific types . (See the Microsoft.CSharp, Microsoft.VisualBasic, and Microsoft.Win32 namespaces as examples .) Creating a namespace is simply a matter of writing a namespace declaration into your code as follows (in C#):
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namespace CompanyName { public sealed class A { } namespace X { public sealed class B { ... } } } // TypeDef: CompanyName.A
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// TypeDef: CompanyName.X.B
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The comment on the right of the class definitions above indicates the real name of the type the compiler will emit into the type definition metadata table; this is the real name of the type from the CLR s perspective . Some compilers don t support namespaces at all, and other compilers are free to define what namespace means to a particular language . In C#, the namespace directive simply tells the
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4 Type Fundamentals
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compiler to prefix each type name that appears in source code with the namespace name so that programmers can do less typing .
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How Namespaces and Assemblies Relate
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Be aware that a namespace and an assembly (the file that implements a type) aren t necessarily related . In particular, the various types belonging to a single namespace might be implemented in multiple assemblies . For example, the System.IO.FileStream type is implemented in the MSCorLib .dll assembly, and the System.IO.FileSystemWatcher type is implemented in the System .dll assembly . In fact, the .NET Framework doesn t even ship a System .IO .dll assembly . A single assembly can contain types in different namespaces . For example, the System.Int32 and System.Text.StringBuilder types are both in the MSCorLib .dll assembly . When you look up a type in the .NET Framework SDK documentation, the documentation will clearly indicate the namespace that the type belongs to and also the assembly that the type is implemented in . In Figure 4-1, you can clearly see (right above the Syntax section) that the ResXFileRef type is part of the System.Resources namespace and that the type is implemented in the System .Windows .Forms .dll assembly . To compile code that references the ResXFileRef type, you d add a using System.Resources; directive to your source code, and you d use the /r:System.Windows.Forms.dll compiler switch .
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