Class Member Modifiers

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Class Member Modifiers consist of directives that control virtuality plus others that are independent of each other:

Virtuality Modifiers

Some rules about how these directives can be used in combination:

use abstract or empty, not both
override and reintroduce are mutually exclusive and are only valid if the method's ancestor is virtual
external cannot be mixed with other directives

abstract empty (cannot specify both)

async external locked unsafe (once only in any order)

implements (must be declared last)

There are also different restrictions for fields, methods, properties and events and the following directives are supported:

fields: readonly, implements
methods: virtual, override, abstract, reintroduce, final, empty, locked, async, external, unsafe, implements, partial
properties: virtual, override, abstract, reintroduce, final, locked, implements, default, readonly
events: virtual, override, abstract, reintroduce, final, locked, implements