Detailed explanation of C# default visibility
Understanding the default visibility of classes, members, and other entities in C# is critical to controlling access and managing visibility boundaries. This guide will provide a comprehensive introduction to these default values:
Class visibility:
When a class is declared at the namespace level (not nested within other types), its default visibility is internal. This means that code from outside its own assembly cannot access the class unless explicit access modifiers are used (such as public).
Member visibility (class members):
Regarding the visibility of members in the class, the default value is private. Fields, methods, and other members without declared access modifiers can only be accessed within the class itself.
Member visibility (structure members):
Similar to classes, structure members default to private visibility. Unless explicitly modified, fields, methods, and other structure members can only be accessed within the structure.
Interface visibility:
The default visibility of the interface is internal. This means that the type that implements the interface must be in the same assembly, or inherit from a type that is in the same assembly.
Delegate visibility:
Delegates behave like classes in terms of visibility. When declared at the namespace level (not nested), they have internal default visibility. Nested delegates, like class and structure members, have private visibility by default.
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