BoxKite.Twitter.FriendsFollowersExtensions.CreateFriendship C# (CSharp) Метод

        public async static Task<User> CreateFriendship(this IUserSession session, string screenName = "",
            int user_id = 0, bool follow=true)
        {
            var parameters = new TwitterParametersCollection();
            parameters.Create(screen_name:screenName,user_id:user_id,follow:follow);

            if (parameters.EnsureEitherOr("screen_name", "user_id").IsFalse())
            {
                return session.MapParameterError<User>(
                        "Either screen_name or user_id required");
            }

            return await session.PostAsync(TwitterApi.Resolve("/1.1/friendships/create.json"), parameters)
                          .ContinueWith(c => c.MapToSingle<User>());
        }