C# interfaces doesn't contain data members

[DGtech]

why C# interfaces doesn't contain data members?

[Pete OHanlon]

Because it doesn't actually implement anything. It only provides a contract that states what methods/properties will be present.

Deja View - the feeling that you've seen this post before.

[Colin Angus Mackay]

Because that is not the purpose of an interface. An interface defines the public interface* of a class (or part of a class) that implements the interface. If you want data members then you should look at implementing an abstract class. * Note there is a difference between interface and interface

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