c# - 由于其保护级别而无法访问

Question

我想不通。问题是距离、球杆、cleanclub、洞、分数和标准杆都说由于保护级别而无法访问，我不知道为什么，因为我认为我做的一切都是正确的。

namespace homeworkchap8
{
    public class Clubs
    {
        protected string club;
        protected string distance;
        protected string cleanclub;
        protected string scores;
        protected string par;
        protected string hole;            

        public string myclub
        {
            get { return club; }
            set {club = value; }
        }        
        public string mydistance
        {
            get { return distance; }
            set { distance = value; }
        }        
        public string mycleanclub
        {
            get { return cleanclub; }
            set { cleanclub = value; }
        }       
        public string myscore
        {
            get { return scores; }
            set { scores = value; }
        }       
        public string parhole
        {
            get { return par; }
            set { par = value; }
        }       
        public string myhole
        {
            get { return hole; }
            set { hole = value;}
        }
    }   
}

这是派生类:

namespace homeworkchap8
{
    public class SteelClubs : Clubs, ISwingClub
    {
        public void SwingClub()
        {
            Console.WriteLine("You hit a " + myclub + " " + mydistance);
        }

        public void clean()
        {
            if (mycleanclub != "yes")
            {
                Console.WriteLine("your club is dirty");
            }
            else
            {
                Console.WriteLine("your club is clean");
            }
        }

        public void score()
        {   
            Console.WriteLine("you are on hole " + myhole + " and you scored a " + 
                myscore + " on a par " + parhole);
        }            
    }
}

这是界面:

namespace homeworkchap8
{
    public interface ISwingClub
    {
        void SwingClub();
        void clean();
        void score();
    }  
}

主要代码如下:

namespace homeworkchap8
{
    class main
    {    
        static void Main(string[] args)
        {    
            SteelClubs myClub = new SteelClubs();
            Console.WriteLine("How far to the hole?");
            myClub.distance = Console.ReadLine();
            Console.WriteLine("what club are you going to hit?");
            myClub.club = Console.ReadLine();
            myClub.SwingClub();

            SteelClubs mycleanclub = new SteelClubs();
            Console.WriteLine("\nDid you clean your club after?");
            mycleanclub.cleanclub = Console.ReadLine();
            mycleanclub.clean();

            SteelClubs myScoreonHole = new SteelClubs();
            Console.WriteLine("\nWhat hole are you on?");
            myScoreonHole.hole = Console.ReadLine();
            Console.WriteLine("What did you score on the hole?");
            myScoreonHole.scores = Console.ReadLine();
            Console.WriteLine("What is the par of the hole?");
            myScoreonHole.par = Console.ReadLine();

            myScoreonHole.score();

            Console.ReadKey();    
        }
    }
}

Answer 1

在您的基类 Clubs 中，以下内容被声明为 protected

• 俱乐部；
• 距离；
• 清洁俱乐部；
• 分数；
• 标准；
• 洞；

这意味着这些只能由类本身或派生自 Clubs 的任何类访问。

在您的 main 代码中，您尝试在类本身之外访问这些。例如:

Console.WriteLine("How far to the hole?");
myClub.distance = Console.ReadLine();

您已经(有些正确地)为这些变量提供了公共(public)访问器。例如:

public string mydistance
{
    get
    {
        return distance;
    }
    set
    {
        distance = value;
    }
}        

这意味着您的主要代码可以更改为

Console.WriteLine("How far to the hole?");
myClub.mydistance = Console.ReadLine();