Default interface methods are included in a new feature proposal for C# 8, which will allow developers to use the traits programming technique on the .NET platform.

Take advantage of default interface methods in C# 8.0 to add new methods to an interface without breaking existing implementations.

Take advantage of read-only generic interfaces such as IReadOnlyList, IReadOnlyDictionary, and IReadOnlyCollection to prevent modifications to collections in your .NET Core applications.

Dynamically adjust data with implicit incrementalization – a C# example How do you change data in a running program? Incremental change propagation and the .NET library NMF Expressions help with ...