Variance applied to a type parameter on the declaration site (declaration-site variance), or to a type in a projection (use-site variance).
The affected type parameter or type is invariant, which means it has no variance applied to it.
The affected type parameter or type is contravariant. Denoted by the in modifier in the source code.
The affected type parameter or type is covariant. Denoted by the out modifier in the source code.
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
Returns an array containing the constants of this enum type, in the order they're declared.