VS 2017版本 Set限制问题

   class Child

    {

        private string sex;

        private int age;

        private double height;

        public string Sex

        {

            get { return sex; }

            set { sex = value; }

        }

        public int Age { get => age; set => age = value; }

        public double Height { get => height; set => height = value; }

    }在这个封装公式里面怎么添加Set判断逻辑？