隐式调用父类的构造函数-创新互联

代码如下：

Person.cs文件。

using System;
using System.Collections.Generic;
using System.Text;

namespace InheritDemo
{
   public class Person
   {
       private string id;
       public string Id
       {
           get
           {
               return id;
           }
           set
           {
               id = value;
           }
       }
       private string name;
       public string Name
       {
           get
           {
               return name;
           }
           set
           {
               name = value;
           }
       }
       private int age;
       public int Age
       {
           get
           {
               return age;
           }
           set
           {
               age = value;
           }
       }
       private string gender;
       public string Gender
       {
           get
           {
               return gender;
           }
           set
           {
               gender = value;
           }
       }
         public Person(string name1, int age1, string gender1)
       {
           name = name1;
           age = age1;
           gender = gender1;
       }
       public void Display()
       {
           Console.WriteLine("{0}是{1}性，年龄为{2}",this.name,this.gender,this.age);
       }

   }

   public class Student : Person
   {
       private string class1;
       public string Class
       {
           get
           {
               return class1;
           }
           set
           {
               class1 = value;
           }
       }
       private string department;
       public string Department
       {
           get
           {
               return department;
           }
           set
           {
               department = value;
           }
       }
       private string no;
       public string No
       {
           get
           {
               return no;
           }
           set
           {
               no = value;
           }
       }
        public void Study()
       {
           Console.WriteLine("学生在学校学习。");
           Console.Read();
       }
   }
}

Program.cs文件。

using System;
using System.Collections.Generic;
using System.Text;

namespace InheritDemo
{
   class Program
   {
       static void Main(string[] args)
       {
           Person objPerson = new Person("XXX",XX,"X");
           objPerson.Display();
           Student objStudent = new Student();
           objStudent.Name = "XXX";
           objStudent.Age = XX;
           objStudent.Gender = "X";
           objStudent.Class = "XXXXXXXXX";
           objStudent.Display();
           Console.Read();
       }
   }
}

错误：“Person”方法没有采用“0”个参数的重载。

原因：子类的构造函数没有使用base指明调用父类哪个构造函数。

解决办法：

using System;
using System.Collections.Generic;
using System.Text;

namespace InheritDemo
{
   public class Person
   {
       private string id;
       public string Id
       {
           get
           {
               return id;
           }
           set
           {
               id = value;
           }
       }
       private string name;
       public string Name
       {
           get
           {
               return name;
           }
           set
           {
               name = value;
           }
       }
       private int age;
       public int Age
       {
           get
           {
               return age;
           }
           set
           {
               age = value;
           }
       }
       private string gender;
       public string Gender
       {
           get
           {
               return gender;
           }
           set
           {
               gender = value;
           }
       }
       public Person() { }  //隐式的调用，base()，父类要提供无参的构造函数。
       public Person(string name1, int age1, string gender1)
       {
           name = name1;
           age = age1;
           gender = gender1;
       }
       public void Display()
       {
           Console.WriteLine("{0}是{1}性，年龄为{2}",this.name,this.gender,this.age);
       }

   }

   public class Student : Person
   {
       private string class1;
       public string Class
       {
           get
           {
               return class1;
           }
           set
           {
               class1 = value;
           }
       }
       private string department;
       public string Department
       {
           get
           {
               return department;
           }
           set
           {
               department = value;
           }
       }
       private string no;
       public string No
       {
           get
           {
               return no;
           }
           set
           {
               no = value;
           }
       }
       public Student() { }  //隐式的调用，base()，父类要提供无参的构造函数。
       public void Study()
       {
           Console.WriteLine("学生在学校学习。");
           Console.Read();
       }
   }
}

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