c# - 我如何获得about方法来读取变量？

我试图让我学习的新学生阅读about方法，但是about方法中的变量表示未分配。我以为是因为我在我制作的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();
        }
    }
}

最佳答案

您的问题出在您的string.Format上。您在关闭括号，然后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：

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);

解决此问题将产生输出：


  我的名字叫杰夫，我今年17岁，我就读哥伦比亚大学，正在学习1门课程。


此外，我敦促您查看C＃Polymorphism。这是另一个问题的核心，其他所有人的答案都被忽略了。具体来说，您需要了解virtual，override和new（new，因为它与方法签名有关，与实例无关）。

关于c# - 我如何获得about方法来读取变量？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/22160514/