GENERIC TYPES in VB.NET

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CHAPTER 11 GENERIC TYPES
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An interesting thing happens if you declare a generic nested type with the same type parameter name as the encloser s: public class A<T> { public class B<T> { ... // Here T means B's type parameter } ... // Here T means A's type parameter } which produces the following ILAsm code: .class public A`1<T> { .class nested public B`1<T,T> { ... // Here !0 means A's type parameter ... // And !1 or !T means B's type parameter } ... // Here !0 or !T means A's type parameter } Of course, after such a declaration, the encloser s type parameter T cannot be accessed inside the nested type in C#, because in C# the type parameters are referenced only by their names, and T inside the nested type means the nested type s T. The C# compiler doesn t diagnose this declaration as an error, but, of course, it issues a warning. ILAsm can reference the type parameters by ordinal as well as by name, so duplicate names of type parameters don t prevent these parameters from being addressed.
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Summary of the Metadata Validity Rules
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The metadata tables specific to the generic types (other type-related tables were discussed in 7) include TypeSpec, GenericParam, and GenericParamConstraint. The records of these tables contain the following entries: The TypeSpec record contains the single entry Signature, which must hold a valid offset in the #Blob stream. The GenericParam record contains four entries: Number (2-byte zero-based ordinal of the type parameter), Flags (2-byte bit field containing the constraint flags of the type parameter), Owner (coded token of type TypeOrMethodDef, which must be a valid reference to the TypeDef or Method table), and Name (must be a valid offset in the #Strings stream, can be zero); there must be no duplicate records in the table with identical Number and Owner values. The GenericParamConstraint record contains two entries: Owner (must be a valid RID in the GenericParam table) and Constraint (coded token of type TypeDefOrRef, which must be a valid reference to the TypeDef, TypeRef, or TypeSpec table).
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CHAPTER
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Generic Methods
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eneric methods are methods that carry type parameters in addition to their normal method parameters. These type parameters are subject to all the rules governing the type parameters of generic types, discussed in 11. This simplifies the discussion of generic methods significantly; therefore, this chapter will be brief. The generic parameters of generic methods, as in the case of generic types, are limited to representing only types and can be constrained in the same way. The scope of the generic method s type parameters is the scope of the method itself, which includes the method s signature and body. Methods don t have members or inheritance attributes, which simplifies the discussion even further. Like in the case of generic types, the introduction of genericity does not affect the classification of the methods proposed in 10. We still deal with static and instance methods (independent and dependent of the parent type s instance, respectively) and with virtual and nonvirtual instance methods, only now any method can be generic or not. The genericity of methods is in no way related to the genericity of their owner types. You can have a nongeneric method of a generic type or a generic method of a nongeneric type. The fact that a method s signature and body reference the type parameters of the parent type doesn t make the method generic. What makes a method generic is the presence of its own type parameter list.
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Recall, to define a nongeneric method, you need to supply its name, its parent, its signature, and its flags and, of course, the method s body, unless the method is abstract, internal to the CLR, CLR generated, or P/Invoked from an unmanaged module. To define a generic method, as in the case of generic types, you need also to supply the list of type parameters and define the constraints of each type parameter. Again as in the case of generic types, the generic methods can be referenced only in the form of their instantiations.
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