4.2 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-specifiers:

rank-specifier
rank-specifiers   rank-specifier

rank-specifier:

[   dim-separators_opt   ]

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.