LineIO.cs

// LINEからの入力JSONの形式
        public class LineReply
        {
            public Event[] events { get; set; }
        }
        public class Event
        {
            public string timestamp { get; set; }
            public string replyToken { get; set; }
            public Message message { get; set; }
            public string type { get; set; }
            public Source source { get; set; }
        }

        public class Message
        {
            public string type { get; set; }
            public string id { get; set; }
            public string text { get; set; }
        }

        public class Source
        {
            public string userId { get; set; }
            public string type { get; set; }
        }


        // LINEに投げる形
        public class Response
        {
            public string replyToken { get; set; }
            public List<Messages> messages { get; set; }
        }
        public class Messages
        {
            public string type { get; set; }
            public string text { get; set; }
        }