NAMESPACES AND CLASSES in VB.NET

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CHAPTER 7 NAMESPACES AND CLASSES
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A record in the ClassLayout metadata table has three entries: PackingSize (2-byte unsigned integer). The alignment factor in bytes. This entry must be set to 0 or to a power of 2, from 1 to 128. If this entry is not zero, its value will be used as the alignment factor for fields instead of a natural alignment characteristic of the field types ( natural alignment usually coincides with the size of the type or nearest greater power of 2). For example, if PackingSize is set to 2, and you have two fields a byte and a pointer then your layout will include a byte (first field), another byte (filler), and a pointer; the pointer in this case will be 2-byte aligned, which is a bad thing on almost all processor architectures. If, however, the PackingSize value is greater than the natural alignment of a field, the natural alignment is used; if, for example, PackingSize is set to 2, and you have two 1-byte fields, then your layout will include just 2 bytes (first field, second field) without any filler between them. ClassSize (4-byte unsigned integer). The total requested layout size of the type. If the type has instance fields and the summary size of these fields, aligned by PackingSize, is different from ClassSize, the loader allocates the larger of the two sizes for the type. Parent (RID in the TypeDef table). An index of the type definition record to which this layout belongs. The ClassLayout table should not contain any duplicate records with the same Parent entry value.
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Namespace and Full Class Name
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It is time to talk seriously about names in the common language runtime and ILAsm. So far, in 6, you ve encountered only names that were in fact filenames and hence had to conform to well-known filename conventions. From now on, however, you ll need to deal with names in general, so it is important to know the rules.
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ILAsm Naming Conventions
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Names in ILAsm are either simple or composite. Composite names are composed of simple names and special connection symbols such as a dot. For example, System and Object are simple names, and System.Object is a composite name. The length of either kind of name in ILAsm is not limited syntactically, but metadata rules impose certain limitations on the name length. The simplest form of a simple name is an identifier, which in ILAsm must begin with an alphabetic character or one of the following characters: #, $, @, _ and continue with alphanumeric characters or one of the following: , $, @, _, ` (The last symbol is not an apostrophe; it is a backtick.)
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CHAPTER 7 NAMESPACES AND CLASSES
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These are examples of valid ILAsm identifiers: Object _Never_Say_Never_Again_ men@work GType`1
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Caution One obvious limitation on ILAsm identifiers is that an ILAsm identifier must not match any of the
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(rather numerous) ILAsm keywords.
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The common language runtime accepts a wide variety of names with very few limitations. Certain names for example, .ctor (an instance constructor), .cctor (a class constructor, a.k.a. type initializer), and _Deleted* (a metadata item marked for deletion during an editand-continue session) are reserved for internal use by the runtime. Generally, however, the runtime is liberal about names. As long as a name serves its purpose identifying a metadata item unambiguously and cannot be misinterpreted, it is perfectly fine. This liberalism, of course, includes names beginning with wrong (from the ILAsm point of view) symbols and names continuing with wrong symbols, not to mention the names that happen to match ILAsm keywords. To cover this variety, ILAsm offers an alternative way to present a simple name: as a single-quoted literal. For example, these are valid ILAsm simple names: '123' 'Space Between' '&%!' One of the most frequently encountered kinds of composite names is the dotted name, a name composed of simple names separated by a dot: <dotted_name> ::= <simple_name>[.<simple_name>*] Examples of dotted names include the following: System.Object '123'.'456'.'789' Foo.Bar.'&%!'
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