C# 从类获取数据后使用枚举

我是C#的初学者，当我遇到这个问题时，我正在试验类和数据结构。我想使用grade char-giving char-input从它的枚举描述中获取int输出。欢迎任何帮助。谢谢

using System;
namespace dataStorageOfFiveStudents
{
     public class StudentData
     {
          public string name;
          public int rollNo;
          public char grade;
          public float gpa;
     }
    public class Program
    {
        enum grading { A=4, B=3, C=2, D=2, F=0};
        static void Main(string[] args)
        {
            //Data Entry
            StudentData student1 = new StudentData();
            Console.WriteLine("name?");
            student1.name = Console.ReadLine();
            Console.WriteLine("Roll Number?");
            student1.rollNo = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Grade");
            student1.grade = Convert.ToChar(Console.ReadLine());
            student1.gpa = (int)grading.student1.grade;
            //Output
            Console.WriteLine("Name =\t" + student1.name);
            Console.WriteLine("Roll No =\t" + student1.rollNo);
            Console.WriteLine("Grade =\t" + student1.grade);
            Console.WriteLine("GPA =\t" + student1.gpa);
            Console.ReadKey();
        }
    }
}

你应该使用或

---

使用

Enum.Parse

假设：

 public class StudenData {
     public string name { get;set; }
     public int rollNo {get;set; }
     public string grade { 
         get { return gpaEnum.ToString(); }
         set { gpaEnum = (grading)Enum.Parse(typeof(grading),value); }
     public gpaEnum { get;set; }
     public int gpa {
         get { return (int)gpaEnum; }
         set { gpaEnum=(grading)value; }
     }
 }

然后

编辑---因为数据结构看起来是固定的

public class StudenData {
     public string name { get;set; }
     public int rollNo {get;set; }
     public char grade { get;set; }
     public float gpa { get;set; }
 }

然后

---

此代码没有错误检查。如果要添加验证检查，而不是失败解析的异常，可以使用Enum.TryParse执行此代码

student1.gpa = (int)(Enum.Parse(typeof(grading), student1.grade.ToString().ToUpper()));

---

@莱皮：谢谢你接电话。起初我没有仔细查看

StudentData

，但现在应该修复编译错误。如果我手头有VisualStudio进行测试就好了…@leppie，你对学生数据有限制吗？如果将我的原始答案与更改后的studentdata一起使用，则意味着所有逻辑都在课堂中，用于翻译，而不是外部。

public class StudenData {
     public string name { get;set; }
     public int rollNo {get;set; }
     public char grade { get;set; }
     public float gpa { get;set; }
 }

   //Data Entry   
    StudentData student1 = new StudentData();   
    Console.WriteLine("name?");   
    student1.name = Console.ReadLine();   
    Console.WriteLine("Roll Number?");   
    student1.rollNo = Convert.ToInt32(Console.ReadLine());   
    Console.WriteLine("Grade");   
    grading grade = (grading)Enum.Parse(typeof(grading),Console.ReadLine());
    student1.grade = grade.ToString()[0]; // Grab first char of grade.
    student1.gpa = (float)(int)grade;
    //Output   
    Console.WriteLine("Name =\t" + student1.name);   
    Console.WriteLine("Roll No =\t" + student1.rollNo);   
    Console.WriteLine("Grade =\t" + student1.grade);   
    Console.WriteLine("GPA =\t" + student1.gpa); 
    Console.ReadKey();   

student1.gpa = (int)(Enum.Parse(typeof(grading), student1.grade.ToString().ToUpper()));