This is just a short reminder to all C# developers defining and implementing interfaces with a single method:
What you are looking for is
delegate
A delegate
is a way to define the signature of a method. It can then be implemented by a Func
, an Action
or class method, whichever fits the best.
They even work nicely with dependency injection: a delegate
is just a definition, not an implementation. If you want to preserve testability, that's taken care of: in tests you can just pass in a dummy implementation by way of a Func
or Action
; no mocking framework needed.
Here's an example
// Definition
public delegate void SendEmail(string recipient, string sender, string subject, string message);
// Registering with a DI system
services.AddTransient(_ => (recipient, sender, subject, message) => { /* Implementation */ });
// or
services.AddTransient(_ => StaticClassWithImplementation.StaticMethodImplementingDelegate);
// In testing
var systemUnderTest = new ClassThatNeedsToSendEmails((_, __, ___, ____) => { log.Info("Sent email"); });
Don't overcomplicate with interfaces and classes, what could simply be a delegate.
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