why abstract class is compare with interface.

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In c#, an abstract class is supposed to compare with concrete class? Why most of the authors are comparing abstract class with interface?

Posted 19-May-14 4:22am

Bhim B Thapa

Updated 19-May-14 4:33am

Nirav Prabtani

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Sergey Alexandrovich Kryukov 19-May-14 12:10pm

Ask those authors. I personally don't know where somebody "compares" them. Making a choice between abstract class and interface is the usual consideration.
—SA

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Tanuj Rastogi · Answer 1 · 2014-05-19T04:32:00

Solution 1

Because both contains only signatures of methods and usually everyone doesn't know when to use abstract class and where to use interface.

Posted 19-May-14 4:32am

Tanuj Rastogi

*dan!sh* · Answer 2 · 2014-05-19T04:35:00

Solution 2

If you have a notion that abstract class can only be compared to concrete class, then it is incorrect. In a decent article or book, you would find comparison to both. It is predominantly to understand why it exists and when to use it.

Posted 19-May-14 4:35am

dan!sh

Sergey Alexandrovich Kryukov · Answer 3 · 2014-05-19T06:12:00

Solution 3

Please see my comment to the question and my past answers. The choice is not trivial. I've collected the links to all my past answers on one:
Doubts on Interfaces[^].

—SA

Posted 19-May-14 6:12am

Sergey Alexandrovich Kryukov

cristinakity · Answer 4 · 2014-05-19T13:19:00

Solution 4

Using an interface you have to implements every metod tha you declare, and with the abstract not, i believe thats the diference, if iam wrong please tell me.

Posted 19-May-14 13:19pm

cristinakity

Pravuprasad · Answer 5 · 2014-05-23T01:18:00

Solution 5

Generally people compare these two because when a abstract class contains only abstract methods then it can be called as interface.

Posted 23-May-14 1:18am

Pravuprasad