C#之特性

 public class MyAttribute : Attribute
    {
        public int Min { get; set; }
        public int Max { get; set; }
        public MyAttribute() { }
        public MyAttribute(int min, int max)
        {
            this.Min = min;
            this.Max = max;
        }
    }

public class MyAttribute : Attribute
    {
        public int Min { get; set; }
        public int Max { get; set; }
        public MyAttribute() { }
        public MyAttribute(int min, int max)
        {
            this.Min = min;
            this.Max = max;
        }
        public bool Validate(Person person)
        {
            if (person.Age >= this.Min && person.Age <= this.Max) {
                Console.WriteLine("年龄不合法");
                return true;
            }
            else
            {
                return false;
            }
        }
    }
    public class Person
    {
        //规定年龄范围  18-50
        [MyAttribute(18,50)]
        public int Age { get; set; }
        public void Print()
        {
            Console.WriteLine(this.Age.ToString());
        }
    }

    public static class Validate
    {
        public static bool ValidatePerson(this Person p)
        {
            Type type = p.GetType();
            foreach (var prop in type.GetProperties())
            {
                if (prop.IsDefined(typeof(MyAttribute)))
                {
                    MyAttribute myAttribute=(MyAttribute)prop.GetCustomAttribute(typeof(MyAttribute));
                    if (myAttribute.Validate(p))
                    {
                        Console.WriteLine("验证正确");
                    }
                    else
                    {
                        Console.WriteLine("验证错误");
                        return false;
                    }
                }
            }

            return true;
        }
        
    }

 Person person = new Person() { Age=10};
                  
                    person.ValidatePerson();