Default interface methods are included in a new feature proposal for C# 8, which will allow developers to use the traits programming technique. Based on an existing language feature found in Java ...

A controversial new proposal for .NET suggests the introduction of a limited form of multiple inheritance via abstract interfaces. This feature was inspired by Java’s default methods.

Use inheritance in OOP and C#. ... Additionally, if your types don’t have an “is a” relationship but you need polymorphism, use composition with interfaces. As a rule, ...