Compare two System.Enum of type T

Question

I am pretty close to understand Generics now (I think).
However, just figured that System.Enum is not easy to implement as a generic type. I have this class:

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Answer 1

You are trying to perform a reference comparison on a value type (struct), use Equals for equality instead:

public Button GetButton(TEnum Identifier) {
    var button = _buttons
        .Where(b => EqualityComparer.Default.Equals(b.Identifier, Identifier))
        .FirstOrDefault();

    if (button == null)
        Debug.Log("'" + GetType().Name + "' cannot return an unregistered '" + typeof(Button).Name + "' that listens to '" + typeof(TEnum).Name + "." + Identifier.ToString() + "'.");
    return button;
}

The button.Identifier == Identifier statement cannot be performed, because the == operator does not exist for structs. On a class it would have performed a reference comparison.

And as @JeppeStigNielsen noted in his answer, to prevent a boxing equality comparison, it is better to use the EqualityComparer.Default.Equals method.