Explain "Explicit Interface Implementation" (C#) and when it's needed.
Explicit Interface Implementation in C#
Explicit interface implementation in C# allows a class to implement an interface member so that the member is accessible through the interface reference rather than directly through the class instance. It is particularly useful when two interfaces define members with the same signature but require different behavior, or when an interface member should not form part of the class's normal public API. This provides precise control over interface-specific behavior and avoids naming conflicts.
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Used when multiple interfaces contain conflicting member signatures.
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Allows different implementations for the same interface member name.
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The explicitly implemented member is normally accessed through the interface reference.
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Keeps interface-specific behavior out of the class's ordinary public surface.
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Useful for API compatibility when implementing multiple contracts.
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Should be used intentionally because it can make members less discoverable to callers holding the concrete type.
Follow-up Questions
- What is implicit interface implementation in C#?
- Why would explicit implementation hide a member from the concrete class API?
- Can explicit interface implementations be public?
- How do you resolve two interfaces with the same method name?