Mastering Extension Methods in C#: Simplify Your Code and Boost Your Productivity

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What is an Extension Method?
Most of you are already familiar with the open-closed principle — and here you should still keep it in mind.

Existing program code should be open to new behavior but closed to changes. Code once written (and tested) should never have to be changed again. However, this also means that it can still be expanded.

Extension methods make it possible to extend existing types with new methods without having to change the definition of the original type. An extension method is a static method of a static class where the “this” modifier is passed to the first parameter.

Architectural Integration
Basically, the principles of clean architecture should be observed.
Extension methods should be provided in a separate folder within the domain layer as they can be used by all other layers.

Conclusion
Extension Methods offer a clear advantage if you want to use methods more often and don’t want to receive the respective data via parameters. Please keep in mind that you should always adhere to the principles of Clean Architecture. Defining extension methods within the domain level allows you to avoid code repetition and build a clean code and architecture.