CUSTOM ATTRIBUTES in VB.NET

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CHAPTER 16 CUSTOM ATTRIBUTES
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If the argument is a vector, its encoding begins with a 4-byte element count, followed by the element values. For example, a vector of the three unsigned int16 values 0x1122, 0x3344, and 0x5566 is encoded as follows: 0x03 0x00 0x00 0x00 0x22 0x11 0x44 0x33 0x66 0x55 If the argument is a string, its encoding begins with the compressed string length, followed by the string itself in UTF-8 encoding, without the terminating 0 byte. The length compression formula was discussed in Table 5-1. For example, the string Common Language Runtime is encoded as the following byte sequence, with the leading byte (0x17) representing the string length (23 bytes): 0x17 0x43 0x6F 0x6D 0x6D 0x6F 0x6E 0x20 0x4C 0x61 0x6E 0x67 0x75 0x61 0x67 0x65 0x20 0x52 0x75 0x6E 0x74 0x69 0x6D 0x65 If the argument is an object reference to a boxed primitive value type bool, char, one of the integer types, or one of the floating-point types the encoding consists of SERIALIZATION_TYPE_TAGGED_OBJECT (0x51), followed by 1-byte primitive type encoding, by the value of the primitive value type. The encoding does not support object references to boxed nonprimitive value types. Finally, if the argument is of type System.Type, its encoding is similar to that of a string, with the type s fully qualified name playing the role of the string constant. The rules of the fully qualified type name formatting applied in the custom attribute blob encoding are those of Reflection, which differ from ILAsm conventions. The full class name is formed in Reflection and ILAsm almost identically, except for the separator symbols that denote the class nesting. ILAsm notation uses a forward slash: MyNamespace.MyEnclosingClass/MyNestedClass whereas the Reflection standard uses a plus sign: MyNamespace.MyEnclosingClass+MyNestedClass We find greater difference, however, in the way resolution scope is designated. In ILAsm, the resolution scope is expressed as the external assembly s alias (see 6) in square brackets preceding the full class name. In Reflection notation, the resolution scope is specified after the full class name, separated by a comma. In addition, the concept of the external assembly alias is specific to ILAsm, and Reflection does not recognize it. Thus, if the version, public key token, or culture must be specified, it is done explicitly as part of the resolution scope specification. The following is an ILAsm example: .assembly extern OtherAssembly as OtherAsm2 { .ver 1:2:3:4 .publickeytoken = (01 02 03 04 05 06 07 08) .locale "fr-CA" } ... [OtherAsm2]MyNamespace.MyEnclosingClass/MyNestedClass
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CHAPTER 16 CUSTOM ATTRIBUTES
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In contrast, here is a Reflection example: MyNamespace.MyEnclosingClass+MyNestedClass, OtherAssembly, Version=1.2.3.4, PublicKeyToken=0102030405060708, Culture=fr-CA According to Reflection conventions, the resolution scope specification can be omitted if the referenced class is defined in the current assembly or in Mscorlib.dll. In ILAsm, as you know, the resolution scope is omitted only if the class is defined in the current module. The byte sequence representing the prolog and the constructor arguments is followed by the 2-byte count of the name/value pairs. A name/value pair specifies which particular field or property must be initialized to a certain value. The name/value pair encoding begins with the serialization code of the target: FIELD or PROPERTY. The next byte is the serialization code of the target type, which is limited to the primitive types, enums, STRING, and TYPE. After the target type comes the name of the target, encoded the same way a string argument would be: the compressed length, followed by the string itself in UTF-8 encoding, without the 0 terminator. Immediately after the target name is the target initialization value, encoded similarly to the arguments. For example, the name/ value pair initializing a field (0x53) of type bool (0x02) named Inherited (length 0x09) to true (0x01) is encoded as this byte sequence: 0x53 0x02 0x09 0x49 0x6E 0x68 0x65 0x72 0x69 0x74 0x65 0x64 0x01 There is a specific way to encode the enumerations in name/value pairs. If the type of a field or property is an enum, the target type encoding starts with SERIALIZATION_TYPE_ENUM (0x55) rather than with ELEMENT_TYPE_VALUETYPE, as you would expect. The SERIALIZATION_TYPE_ENUM byte is followed by the compressed length of the full enum s name in Reflection notation and the name itself without the zero terminator.
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