C# 如何获得about方法来读取变量？

我试图让我的新同学阅读about方法，但是about方法中的变量表示它们没有赋值。我认为它们是因为我在每个类中都将它们设置为默认值

namespace studentHeirarchy
{
    class Program
    {
        static void Main(string[] args)
        {
            runStudent();   
        }
        static void runStudent()
        {
            Student one = new Student();
            Console.WriteLine(one.About());
            Console.ReadLine();
        }
    }
}

namespace studentHeirarchy
{
    public class ColumbiaStudent : Student
    {
        public bool isInOOP;

        public ColumbiaStudent()
        {
            isInOOP = true;
        }

        public String About()
        {
            string About = "my favorite course is OOP";
            return About;
        }

        public void GetOOPString()
        {
            throw new System.NotImplementedException();
        }
    }
}

namespace studentHeirarchy
{
    public class Student : Person
    {
        public int NumCourses;
        public string SchoolName;

        public Student()
        {
            NumCourses = 1;
            SchoolName = "Columbia";
        }

        public string About()
        {
            string About = string.Format("my name is{0}, I am {1} years old, I attend {2} and am taking {3} courses."),  Name, Age, SchoolName, NumCourses;
            return About;
        }

        public void AddCourse()
        {
            throw new System.NotImplementedException();
        }

        public void DropCourse()
        {
            throw new System.NotImplementedException();
        }
    }
}

namespace studentHeirarchy
{
    public class Person
    {
        public int Age;
        public string Name;

        public Person()
        {
            Age = 17;
            Name = "Jeff";
        }

        public string About()
        {
            throw new System.NotImplementedException();
        }
    }
}

---

您需要将您的方法声明为虚拟的，在.net中，默认情况下它不是虚拟的。基本上，您正在隐藏该方法。

您没有调用父类的基构造函数。

About

方法也存在问题，必须是虚拟的，否则可能会调用错误的

About

以下是更正后的代码：

namespace studentHeirarchy
{
    class Program
    {
        static void Main(string[] args)
        {
            runStudent();   
        }
        static void runStudent()
        {
            Student one = new Student();
            Console.WriteLine(one.About());
            Console.ReadLine();
        }
    }
}

namespace studentHeirarchy
{
    public class ColumbiaStudent : Student
    {
        public bool isInOOP;

        public ColumbiaStudent() : base()
        {
            isInOOP = true;
        }

        public override String About()
        {
            string About = "my favorite course is OOP";
            return About;
        }

        public void GetOOPString()
        {
            throw new System.NotImplementedException();
        }
    }
}

namespace studentHeirarchy
{
    public class Student : Person
    {
        public int NumCourses;
        public string SchoolName;

        public Student() : base()
        {
            NumCourses = 1;
            SchoolName = "Columbia";
        }

        public override string About()
        {
            string About = string.Format("my name is{0}, I am {1} years old, I attend {2} and am taking {3} courses."),  Name, Age, SchoolName, NumCourses;
            return About;
        }

        public void AddCourse()
        {
            throw new System.NotImplementedException();
        }

        public void DropCourse()
        {
            throw new System.NotImplementedException();
        }
    }
}

namespace studentHeirarchy
{
    public class Person
    {
        public int Age;
        public string Name;

        public Person()
        {
            Age = 17;
            Name = "Jeff";
        }

        public virtual string About()
        {
            throw new System.NotImplementedException();
        }
    }
}

---

您的问题在于

字符串。格式
。关闭括号后，它会认为您在声明其他变量：

string About = string.Format("my name is{0}, I am {1} years old, I attend {2} and am taking {3} courses."),  Name, Age, SchoolName, NumCourses;

应该是：

string About = string.Format("my name is{0}, I am {1} years old, I attend {2} and am taking {3} courses.",  Name, Age, SchoolName, NumCourses);

修复此问题将产生以下输出：

我叫杰夫，今年17岁，就读于哥伦比亚大学，修1门课程

此外，我希望大家看看C。这是另一个问题的核心，其他人的答案都被这一问题所偏离。具体来说，您需要了解
virtual
、
override
和
new
（
new
，因为它与方法签名相关，而不是实例化）。
这样做之后，名称、年龄、NumCourses和SchoolName变量在我的about method中仍然没有使用。非常感谢，你知道有关于多态性的视频吗？当我在doneHa看到它时，我觉得我更明白了，那是一个讨厌的打字错误：）