How deeply does .NET in Action, Second Edition cover abstract class?

Defines incomplete implementations and instantiation constraints, but stops short of a worked abstract-class implementation.

Abstract class

As explained in .NET in Action, Second Edition

An abstract class is a C# class that may contain incomplete implementations and cannot be instantiated directly.

An abstract class is an incomplete C# implementation that provides a base for derived classes. It cannot be instantiated directly, and derived classes must implement members marked with the abstract keyword. section 2.8

Use abstract classes when a shared base implementation should require specialization:

Derive classes from one abstract class and fill in its missing implementations. section 2.8
Mark unimplemented methods or properties with abstract. section 2.8
Choose interfaces when classes need multiple contracts, because a class can inherit from only one base class but implement multiple interfaces. section 2.8

How .NET in Action, Second Edition covers it

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Also explained in

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Practices of the Python ProAn abstract base class is a class intended to define a common interface or behavior for subclasses and that may prevent direct instantiation until required methods are implemented.
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The Well-Grounded Python Developer: How the pros use Python and FlaskAn abstract class is a class intended to define shared structure or behavior without being instantiated directly.
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100 C++ Mistakes and How to Avoid ThemAn abstract base class is a C++ base class intended to define behavior for derived classes and not to be instantiated directly.
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Software Design for Python ProgrammersAn abstract superclass is a superclass intended to define shared structure or required behavior without being instantiated directly.
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Essential TypeScript 5, Third EditionAn abstract class is a class that can define shared members while preventing direct instantiation and requiring derived classes to implement designated abstract members.

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Related concepts

contractincludes · An API contract is a specification of the operations, data, and behavioral expectations that govern interactions between software components.
classkind of · A class is a programming-language construct that defines a type’s structure or behavior and provides a basis for creating or representing objects.
interfacecontrasts with · A software interface is a contract or boundary that specifies the operations, properties, or capabilities through which types or components interact, without requiring a particular implementation.
abstractmethodconfigured by · abstractmethod is a decorator from Python's abc module that marks a method as abstract and requires concrete subclasses to implement it.

This explainer was generated by Manning's knowledge graph from the text of .NET in Action, Second Edition. The section links point to the parts of the book it draws on.