如何在不同的方法中使用變量？

Question

我正在用C＃編寫一個程序，控制檯應用程序，我遇到了一個問題。

到目前爲止，我已經有五類的：主類，這是Program和其他四個Teacher，Student，Course，Class。

我的問題是，我收到來自用戶的信息和信息都在另一種方法。

我希望能夠使用我從用戶處獲得的輸入，並以不同的方法使用它來編輯輸入。

只是說程序應該能夠編輯輸入的，我不能使它的工作？！？ ，這是我寫的代碼：

struct Students 
{ 
    public string name; 
    public string family; 
    public int ID; 
    public string Major; 
    public int studentCode; 
} 

class Student 
{ 
    public static void ShowStudent() 
    { 
     Console.Clear(); 
     Console.WriteLine("This is Student's Section:\n"); 
     Console.WriteLine("===================================="); 
     Console.WriteLine("Enter the Number Of the Section you want to Work with:\n"); 
     Console.WriteLine("1 Submit"); 
     Console.WriteLine("2 Edit"); 
     Console.WriteLine("3 Back"); 
     string choice = Console.ReadLine(); 

     switch (choice) 
     { 
      case "1": 
       ReciveStudent(); 
       break; 
      case "2": 
       break; 
      case "3": 
       Program.mainShow(); 
       break; 
      default: 
       Console.Clear(); 
       Console.WriteLine("Please Enter INrange Number.\nPress any Key to Continue...."); 
       Console.ReadKey(); 
       ShowStudent(); 
       break; 
     } 
    } 

    public static void ReceiveStudent() 
    { 
     Console.Clear(); 
     int n; 

     Console.WriteLine("How Many Student's you Want to Enter?"); 
     n = Convert.ToInt32(Console.ReadLine()); 
     Students[] st = new Students[n]; 

     for (int i = 0; i < n; i++) 
     { 
      Console.WriteLine("Enter Student ID:"); 
      st[i].ID = Convert.ToInt32(Console.ReadLine()); 
      Console.WriteLine("Enter Student CODE:"); 
      st[i].studentCode = Convert.ToInt32(Console.ReadLine()); 
      Console.WriteLine("Enter Student Name:"); 
      st[i].name = Console.ReadLine(); 
      Console.WriteLine("Enter Student Family:"); 
      st[i].family = Console.ReadLine(); 
      Console.WriteLine("Enter Student Major:"); 
      st[i].Major = Console.ReadLine();       
     } 

     ShowStudent(); 
    } 
} 

的ShowStudent()方法被稱爲主，它是program.cs（void main）。

我想用不同的方法使用數組值。

感謝您的評論...

謝謝你們。

Answer 1

返回方法RecieveStudent從用戶收集的數據，並將該數據用作另一個方法的輸入。

更改RecieveStudent到：public static Students[] RecieveStudent()

public static Students[] RecieveStudent() { 
    // your code here as is 
    return st; 
} 

，並使用返回數組作爲輸入到其他方法：

Students[] students = ReceiveStudent(); 
otherMethod(students) // Do other work on data 

順便說一句，您的命名可以使用一些工作。例如。你的結構學生實際上並沒有模擬一羣學生，但只有一個。

編輯：

struct Students 
{ 
    public string name; 
    public string family; 
    public int ID; 
    public string Major; 
    public int studentCode; 
} 

class Student 
{ 
    public static void ShowStudent() 
    { 
     Console.Clear(); 
     Console.WriteLine("This is Student's Section:\n"); 
     Console.WriteLine("===================================="); 
     Console.WriteLine("Enter the Number Of the Section you want to Work with:\n"); 
     Console.WriteLine("1 Submit"); 
     Console.WriteLine("2 Edit"); 
     Console.WriteLine("3 Back"); 
     string choice = Console.ReadLine(); 
     Students[] students = null; 

     switch (choice) 
     { 
      case "1": 
       students = ReciveStudent(); 
       break; 
      case "2": 
       break; 
      case "3": 
       Program.mainShow(); 
       break; 
      default: 
       Console.Clear(); 
       Console.WriteLine("Please Enter INrange Number.\nPress any Key to Continue...."); 
       Console.ReadKey(); 
       ShowStudent(); 
       break; 
     } 

     // Use variable 'students' here 
     // Remember to check for null as it might not have been mutated in the switch-case. 
     if (students != null) 
     { 
      // Do something with students here... just printing it for now. 
      Console.WriteLine(students.ToString()); 
     } 
    } 

    public static Students[] ReceiveStudent() 
    { 
     Console.Clear(); 
     int n; 

     Console.WriteLine("How Many Student's you Want to Enter?"); 
     n = Convert.ToInt32(Console.ReadLine()); 
     Students[] st = new Students[n]; 

     for (int i = 0; i < n; i++) 
     { 
      Console.WriteLine("Enter Student ID:"); 
      st[i].ID = Convert.ToInt32(Console.ReadLine()); 
      Console.WriteLine("Enter Student CODE:"); 
      st[i].studentCode = Convert.ToInt32(Console.ReadLine()); 
      Console.WriteLine("Enter Student Name:"); 
      st[i].name = Console.ReadLine(); 
      Console.WriteLine("Enter Student Family:"); 
      st[i].family = Console.ReadLine(); 
      Console.WriteLine("Enter Student Major:"); 
      st[i].Major = Console.ReadLine();       
     } 

     ShowStudent(); 

     return st; 
    } 
}