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Nullability of reference types in type of parameter 'x' of 'bool ApiComparer.Equals(IWebApi x, IWebApi y)' doesn't match implicitly implemented member 'bool IEqualityComparer<IWebApi>.Equals(IWebApi? x, IWebApi? y)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'y' of 'bool ApiComparer.Equals(IWebApi x, IWebApi y)' doesn't match implicitly implemented member 'bool IEqualityComparer<IWebApi>.Equals(IWebApi? x, IWebApi? y)' (possibly because of nullability attributes).

The member 'ApiList.Count()' does not hide an accessible member. The new keyword is not required.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

The default value specified for parameter 'parentApiResult' will have no effect because it applies to a member that is used in contexts that do not allow optional arguments

Cannot convert null literal to non-nullable reference type.