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Abstract methods in non-abstract classes, on the contrary

What is the purpose of defining non-abstract methods in abstract classes and abstract methods in non-abstract classes?

What, where are useful scripts for using them?

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  • You cannot declare a method abstractin a non-abstract class. From the C # spec:

    10.6.6 Abstract Methods

    (...) Abstract method declarations are allowed only in abstract classes (§10.1.1.1).

  • A non-abstract method in a class abstractis a method that should not (or sometimes even cannot) be overridden in derived classes.

    , ( virtual) , ( virtual).

    , ( - ).

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An abstract class declaring nothing but abstract methods is slightly different than an interface declaration; typically, an abstract class includes some minimal / non-executable default functionality, leaving abstract stubs for things that depend on the implementation.

... and abstract methods in non-abstract classes?

You cannot declare abstract methods in a non-abstract class.

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in this case, define your method as Virtual, not Abstract.

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