创建子类对像时候 默认调用父类的无参数的构造函数,不会调用带参数构造函数
创建子类对象的时候可以调用父类的带参数的构造函数,在子类的构造函数后面:base()调用父类的构造
动物类 父类
            
            
              cs
              
              
            
          
          class Animal 
{
    public string Name { get; set; }
    public char Sex;
    public Animal()
    {
        Console.WriteLine("我是Animal的五参数的构造函数");
    }
    public Animal(string n1, char s1)
    {
        Name = n1;
        Sex = s1;
        Console.WriteLine("我是Animal的有参数的构造函数");
    }
}
        小狗类 子类
            
            
              cs
              
              
            
          
          class Dog :Animal
{
    public Dog()
    {
        Console.WriteLine("我是Dog的无参数的构造函数");
    }
    // :base()基础类,父类, :base()调用父类的构造函数,父类又是带参数的构造函数,所以base传递两个参数
    // base(n1,'男')两个参数分别是(藏獒,'男')
    public Dog(string n1):base(n1,'男')
    {
        Console.WriteLine("我是Dog类的带参数的构造函数");
    }
}
        Main
            
            
              cs
              
              
            
          
          Dog jinmao = new Dog();
Console.WriteLine(jinmao.Name +"," +jinmao.Sex);
Dog zangao = new Dog("藏獒");
Console.WriteLine(zangao.Name +","+zangao.Sex);