把我的函數放在哪裏，以便可以從我的switch語句中調用它？

Question

我很新的C＃編程，我有一個問題。我不知道在哪裏放置我的函數，以及如何聲明它們，以便我可以從我的switch語句中調用它們。是否我能夠用我的numberarr和wordarr陣列在我的功能或者我還需要創建一個單獨的功能呢？這裏是我的代碼：

class Program 
{ 
    enum Menu 
    { 
     Numbers = 1, 
     Words = 2, 
     Exit = 3, 
    } 

    static void Main(string[] args) 
    { 
     bool isValid; 
     do 
     { 
      isValid = true; 
      Menu menu = 0; 
      int number; 
      string word; 

      Console.WriteLine("Choose an option from the menu: "); 
      Console.WriteLine("1. Numbers "); 
      Console.WriteLine("2. Words "); 
      Console.WriteLine("3. Exit "); 

      switch (menu) 
      { 
       case Menu.Numbers: 

        List<int> numberarr = new List<int>(); 
        Console.WriteLine("Please input as many numbers as you like or type exit"); 
        number = int.Parse(Console.ReadLine()); 
        numberarr.Add(number); 



        break; 
       case Menu.Words: 
        List<string> wordarr = new List<string>(); 
        Console.WriteLine("Please input as many numbers as you like"); 
        word = Console.ReadLine(); 
        wordarr.Add(word); 

        break; 

       case Menu.Exit: 

        break; 
       default: 
        Console.WriteLine("You have made an invalid selection, try again"); 
        isValid = false; 
        break; 
      } 
     } while (isValid); 

    } 
} 
class Choice 
{ 
    static void Numbers(int sum, int count, int average, int max, int min) 
    { 

    } 

    static void Words(string[] args) 
    { 

    } 
    static void Exit() 
    { 

    } 
} 

Answer 1

不能使用的方法在Main中的Choice類中定義，因爲您尚未使用public標識符聲明它們。在C＃中，類屬性默認爲private，所以除非您明確聲明它們爲public，否則只有類本身才會知道它們的存在。

所以基本上只是從static void MethodName改變所有聲明的Choice至public static void MethodName，然後你就可以從Choice類一樣叫他們主要的;

Choice.Exit(); 

編輯：你還需要做一些改變，使switch語句工作。正如在評論中指出的那樣，menu的值不是0。我建議你使用更類似於以下的東西;

 isValid = true; 
     int menu = 0; 
     int number; 
     string word; 

     Console.WriteLine("What type do you want to use?"); 
     Console.WriteLine("Press 1 for numbers, 2 for words, or 3 exit."); 
     string input = Console.ReadLine(); // we must read the users input 

     if (!int.TryParse(input, out menu)) 
     { 
      // the user didn't enter a number make them try again 
      // note you might want to use a loop here to ensure the program does not 
      // proceed until the user has entered "1", "2", or "3" 
     } 

     switch (menu) 

Answer 2

如果我理解你的問題，只是把你的功能在你的班級裏。我相應地調整了您的代碼。您的單詞/數字類也可能有問題。您通常必須實例化它們，但是使用類似Choice myChoice = new Choice（）; 類節目 { 枚舉菜單 { 編號= 1， 字= 2， 退出= 3， }

static void Main(string[] args) 
{ 
    bool isValid; 
    do 
    { 
     isValid = true; 
     Menu menu = 0; 
     int number; 
     string word; 

     Console.WriteLine("Choose an option from the menu: "); 
     Console.WriteLine("1. Numbers "); 
     Console.WriteLine("2. Words "); 
     Console.WriteLine("3. Exit "); 

     switch (menu) 
     { 
      case Menu.Numbers: 

       List<int> numberarr = new List<int>(); 
       Console.WriteLine("Please input as many numbers as you like or type exit"); 
       number = int.Parse(Console.ReadLine()); 
       numberarr.Add(number); 
       int retInt = functionGetInt(number) 


       break; 
      case Menu.Words: 
       List<string> wordarr = new List<string>(); 
       Console.WriteLine("Please input as many numbers as you like"); 
       word = Console.ReadLine(); 
       wordarr.Add(word); 
       string retString = functionGetString(word); 
       break; 

      case Menu.Exit: 

       break; 
      default: 
       Console.WriteLine("You have made an invalid selection, try again"); 
       isValid = false; 
       break; 
     } 
    } while (isValid); 
private string functionGetString(string pParmString) 
{ 
//code 
return "string"; 
} 
private int functionGetInt(int pParmInt) 
{ 

//code 
return 0; 
} 

}

}

Answer 3

編輯：

對於您提出的在這裏，這將是一個possibility.I取出枚舉，我通常試圖解決提供的代碼的代碼，但有沒有必要：

class Program 
    { 
     //enum Menu 
     //{ 
     // Numbers = 1, 
     // Words = 2, 
     // Exit = 3, 
     //} 

     static void Main(string[] args) 
     { 
      bool isValid; 
      do 
      { 
       isValid = true; 
       int menu = 0; 
       int[] number; 
       string word; 

       Console.WriteLine("Choose an option from the menu: "); 
       Console.WriteLine("1. Numbers "); 
       Console.WriteLine("2. Words "); 
       Console.WriteLine("3. Exit "); 

       string s = Console.ReadLine(); 
       while (!Regex.IsMatch(s, "^[1-3]{1}$")) 
       { 
        Console.WriteLine("Please enter a valid choice(1 to 3)"); 
        s = Console.ReadLine(); 
       } 
       menu = Convert.ToInt32(s); 
       switch (menu) 
       { 
        case 1: 
         List<int> numberarr = new List<int>(); 
         Console.WriteLine("Please input as many numbers as you like separeted by space or comma,or type exit"); 
         string numbers = Console.ReadLine(); 
         if (numbers == "exit") 
          Choice.Exit(); 
         else 
         { 
          number = numbers.Split(new char[] { ',', ' ' }).Select(x => int.Parse(x)).ToArray(); 
          numberarr.AddRange(number); 
          Choice.Numbers(numberarr.Sum(), numberarr.Count, numberarr.Average(), numberarr.Max(), numberarr.Min()); 
         } 

         break; 
        case 2: 
         List<string> wordarr = new List<string>(); 
         Console.WriteLine("Please input as many numbers as you like separeted by space or comma"); 
         word = Console.ReadLine(); 
         wordarr.AddRange(word.Split(new char[] { ',', ' ' })); 
         Choice.Words(wordarr); 
         break; 
        case 3: 
         Choice.Exit(); 
         break; 
        default: 
         Console.WriteLine("You have made an invalid selection, try again"); 
         isValid = false; 
         break; 
       } 
      } while (isValid); 
      Console.ReadKey(); 
     } 
    } 

    class Choice 
    { 
     public static void Numbers(int sum, int count, double average, int max, int min) 
     { 
      int a = sum; 
      int b = count; 
      double c = average; 
      int d = max; 
      int e = min; 
      //just as example. 
     } 

     public static void Words(List<string> args) 
     { 
      //do whatever you need here 
     } 
     public static void Exit() 
     { 
      Environment.Exit(0); 
     } 
    }