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c# - Comment the interface, implementation or both?

I imagine that we all (when we can be bothered!) comment our interfaces. e.g.

/// <summary>
/// Foo Interface
/// </summary>
public interface Foo
{
    /// <summary>
    /// Will 'bar'
    /// </summary>
    /// <param name="wibble">Wibble factor</param>
    void Bar(string wibble);
}

Do you also comment the implementation (which may also be provided to clients, e.g. as part of a a library)? If so how do you manage keeping the two in sync? Or do you just add a 'See interface for documentation' comment?

Thanks

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As a general rule, I use the same DRY (Don't Repeat Yourself) principle as with code:

  • on interface, document the interface
  • on implementation, document the implementation specifics

Java specific: when documenting the implementation, use {@inheritDoc} tag to "include" javadocs from the interface.

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