ECMA-334 C# Language Specification

11.2: Reference types

A reference type is a class type, an interface type, an array type, or a delegate type.

reference-type
class-type
interface-type
array-type
delegate-type
class-type
type-name
object
string
interface-type
type-name
array-type
non-array-type rank-specifiers
non-array-type
type
rank-specifier
rank-specifier
rank-specifiers rank-specifier
rank-specifier
[ dim-separatorsopt ]
dim-separators
,
dim-separators ,
delegate-type
type-name

A reference type value is a reference to an instance of the type, the latter known as an object. The special value null is compatible with all reference types and indicates the absence of an instance.

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