C# Language Specification - Willy .Net

C# LANGUAGE SPECIFICATIONattribute-target-specifier:attribute-target :attribute-target:fieldeventmethodparampropertyreturntypeattribute-list:attributeattribute-list , attributeattribute:attribute-name attribute-arguments optattribute-name:type-nameattribute-arguments:( positional-argument-list opt )( positional-argument-list , named-argument-list )( named-argument-list )positional-argument-list:positional-argumentpositional-argument-list , positional-argumentpositional-argument:attribute-argument-expressionnamed-argument-list:named-argumentnamed-argument-list , named-argumentnamed-argument:identifier = attribute-argument-expressionattribute-argument-expression:expressionAn attribute consists of an attribute-name and an optional list of positional and named arguments. Thepositional arguments (if any) precede the named arguments. A positional argument consists of an attributeargument-expression;a named argument consists of a name, followed by an equal sign, followed by anattribute-argument-expression, which, together, are constrained by the same rules as simple assignment. Theorder of named arguments is not significant.The attribute-name identifies an attribute class. If the form of attribute-name is type-name then this namemust refer to an attribute class. Otherwise, a compile-time error occurs. [Example: The exampleclass Class1 {}[Class1] class Class2 {} // Errorresults in a compile-time error because it attempts to use Class1 as an attribute class when Class1 is notan attribute class. end example]Certain contexts permit the specification of an attribute on more than one target. A program can explicitlyspecify the target by including an attribute-target-specifier. When an attribute is placed at the global level, aglobal-attribute-target-specifier is required. In all other locations, a reasonable default is applied, but anattribute-target-specifier can be used to affirm or override the default in certain ambiguous cases (or to just308