Members of a class can have different kinds of accessibility. An accessibility keyword indicates what source code can access the member.  The different types of accessibility are:

  • public - All code can access the member
  • private - Only other code in the class can access the member
  • protected - Code in this class or any class that inherits from this class can access
  • internal - Code in files in the same assembly (.dll or .exe) can access
  • protected internal - Code in the same assembly or in classes that inherit from this class can access

Accessibility keywords can apply to the following kinds of members of a class: fields, properties, methods, constants, indexers, events, constructors and nested types.  They can apply to both instance and static members.

原文地址：#303 - Accessibility of Class Members

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