How do you deal with multiple implementations of the interface prior to Keyed Services?

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Keyed services are a valuable Cooking games improvement for .NET dependency injection. They reduce boilerplate, simplify service resolution, and make applications easier to maintain, test, and extend over time.

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• Injecting IEnumerable<T> and selecting the implementation manually.

• Using a factory pattern to resolve the correct implementation.

• Creating marker interfaces (e.g., IEmailService, ISmsService).

• Using a third-party DI container with named/keyed registrations.

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Before keyed services were introduced in .NET, developers typically handled multiple implementations of the same interface by injecting IEnumerable<T> and selecting the correct implementation at runtime, often using custom logic Geometry Dash Lite or a CanHandle method. Another common approach was to create a factory that encapsulated the selection logic, usually backed by the injected collection of implementations. Some teams used a dictionary-based lookup to map string keys to specific implementations for faster and more predictable access, while others relied on variations of the strategy pattern where the correct implementation was chosen at design time rather than runtime. In some cases, a service locator was used, though it is generally discouraged because it hides dependencies and makes testing harder. Overall, these approaches worked but often introduced extra boilerplate and manual management, which keyed services later simplified by providing a built-in, standardized way to register and resolve multiple implementations by key.