What are the Default Visibility Rules for Classes, Structs, Interfaces, and Nested Types in C#?

Default visibility in C#

In C#, the visibility of a class and its components plays a crucial role in defining its accessibility.

Default visibility of classes and structures

When a class or struct exists independently in a namespace, its default visibility is set to internal. This means it can be referenced by other classes in the same assembly, but is hidden from external assemblies.

Default visibility of class and structure members

Unlike a containing class or struct, the default visibility of its members is private. Methods, fields, and properties declared in a class or structure can only be accessed within the scope of that specific class or structure.

Default visibility of interfaces

The

interface defines the contract that a class implements, and its default visibility is internal. This means that they can be implemented by classes in the same assembly, but their existence is not exposed to external assemblies.

Default visibility of nested types

When a class or struct is inside another containing class or struct, its default visibility depends on the type of the nested type:

• Nested class: private
• Nested interface: public
• Nested structure: private
• Nested enums: private, unless the containing class or struct is also an enumeration, in which case it is public.

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