Replace Switch Statements with the Strategy Pattern in C#

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In this video, I walk through how to refactor a complex piece of C# code using the Strategy Pattern.

The starting point is an OrderProcessor with a large switch statement that handles shipping cost calculations for multiple providers. That approach works at first, but it quickly becomes harder to maintain, harder to extend, and harder to test as the logic grows.

I show how to extract that behavior into individual strategy classes behind a shared abstraction, register them with dependency injection, and resolve them through IEnumerable[IShippingStrategy] into a dictionary for fast lookup.

We also cover why this refactor is useful in practice:
Smaller, more focused classes
Fewer unnecessary dependencies in your core workflow
Simpler testing of individual behaviors
Easier extension without modifying existing code
Better alignment with the Open/Closed Principle

I also show how easy it becomes to add a new shipping provider once the pattern is in place. Instead of changing the OrderProcessor, you add a new strategy implementation and register it with DI.

If you’ve ever had a class full of if statements or a big switch that keeps growing over time, this refactor will feel very familiar.

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