In this post I provide an introduction to default interface methods, how they work at a high level, their typical uses, and some of their sharp edges

Andrew Lock's blog focuses on ASP.NET Core development, web APIs, and software architecture. Readers can find tutorials, code samples, and explanations covering topics such as RESTful API design, authentication, and authorization in ASP.NET Core. Additionally, they can learn about dependency injection, middleware, and performance optimization techniques.

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This post explains the concept of C# 8 default interface methods, how they work, and their benefits. It also highlights some issues and considerations when using default interface methods.

Understanding C# 8 default interface methods

Evolving the interface is a breaking change

Sharp edges to watch out for with default interface methods

<p>Logic in an interface seems like a sin to me, but it does open up some additional maintenance options for an author. How are these best tested then? Using a concrete implementation to test each default?</p>


<p>I was using C# a lot around like 8 years ago and was very happy about it, but now I can see it got bloated by a ton of useless or even harmful features, and this one is one of them</p>
