C# 构造函数base()实例演示

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //第一种
           // Student st = new Student();
            //DateTime birthdate = new DateTime(2003,5,28); 
            //第二种
            //Student st2 = new Student("lily",birthdate);
            //第三种
            //goodStudent goodst = new goodStudent();
            //第四种
            // goodStudent goodst2 = new goodStudent("harfla");
            //第五种
           // goodStudent goodst3 = new goodStudent("david",new DateTime(1990,6,18),"Tqing");

            Console.ReadKey();
        }
   
    }
}
 public class Student 
    {
        protected int Age;
        public string Name;
        public DateTime   birthDate;
        public int GetAge()
        {
            int ts = DateTime.Now.Year - birthDate.Year;
            return ts;
        }
        public Student()
        {
            Console.WriteLine("默认的构造函数");
        }
        public Student(string name,DateTime  birthDt) 
        {
            this.Name = name;
            this.birthDate = birthDt;
            Console.WriteLine("带参数构造函数");
            Console.WriteLine("name:{0}--birthdate:{1}",Name,birthDate.ToString("yyyy-MM-dd"));
        }
    }
 public class goodStudent : Student 
    {
       static DateTime birthdate = new DateTime(2003,5,20);  
        public int Score;
        public string University;
        public goodStudent()
            : base()
        { }
        public goodStudent(string name,DateTime birthDat,string school)
            : base(name,birthDat)
        {
            this.Age = DateTime.Now.Year - birthDate.Year;
            this.University = school;
            Console.WriteLine("name:{0}--birth:{1}--age:{2}",birthDate.ToString("yyyy-MM-dd"),Age);
            Console.WriteLine("university--{0}",University);
        }
        public goodStudent(string uv)
            : base()
        {

            this.University = uv;
            Console.WriteLine("unviersity:{0}",uv);
        }
    }
第一种结果


第二种结果

?第三种结果

?第四种结果

第五种结果

?

?

?Base 是子类构造函数中引用父类构造函数