如何在一種方法中設定一個值，然后將該值回傳給另一種方法？

我需要一些幫助。如果我理解這一點，“int F”的值會被發送到“FtoC”轉換，然后回傳到 MenuSelect1 方法。現在我想回傳或保存轉換為 MenuSelect2 方法后的值“int C”？我已經嘗試了我能想到的一切，但我只是得到了錯誤。（我現在將代碼重置為原始狀態，其中 MenuSelect1 和 2 ?r 無效）。有什么簡單的方法可以解決這個問題？謝謝你。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


  public static class SecondClass {


  public static int FtoC(int fahrenheit)
  {
    int C = ((fahrenheit - 32) * 5) / 9;
    return C;
  }

  
  public static void MenuSelect1()
  {
    while (true)
    {
      int F = 0;
      Console.Write("\nType how many degrees Fahrenheit you want: ");

      try
      {
        F = Convert.ToInt32(Console.ReadLine());
      }
      
      catch (Exception e)
      {
        Console.ForegroundColor = ConsoleColor.DarkRed;
        Console.WriteLine("ERROR!");
        Console.ForegroundColor = ConsoleColor.White;
      }

      int C = SecondClass.FtoC(F);

      if (C < 80 || C > 87)
      {
        Console.WriteLine("Try a different temperature.");
      }
      else
      {
        Console.WriteLine(C   "°C is perfect. Start the sauna and enjoy!");
        break;
      }
    }
    Console.ReadKey();
  }

   
  public static void MenuSelect2()
  {
    Console.WriteLine("Starting Sauna. Wait for it to reach desired temperature...");
    Console.Write("Temperature: {0}");
    Console.ReadKey();
  }
    

}

uj5u.com熱心網友回復：

您可以MenuSelect2()直接從MenuSelect1()

public static void MenuSelect1()
{
    while (true)
    {
      int F = 0;
      Console.Write("\nType how many degrees Fahrenheit you want: ");

      try
      {
        F = Convert.ToInt32(Console.ReadLine());
      }
      
      catch (Exception e)
      {
        Console.ForegroundColor = ConsoleColor.DarkRed;
        Console.WriteLine("ERROR!");
        Console.ForegroundColor = ConsoleColor.White;
      }

      int C = SecondClass.FtoC(F);

      if (C < 80 || C > 87)
      {
        Console.WriteLine("Try a different temperature.");
      }
      else
      {
        Console.WriteLine(C   "°C is perfect. Start the sauna and enjoy!");
        
        // here
        MenuSelect2(C);
        
        break;
      }
    }
    Console.ReadKey();

}

public static void MenuSelect2(int C)
{
    Console.WriteLine("Starting Sauna. Wait for it to reach desired temperature...");
    Console.Write($"Temperature: {C}");   // <- notice the $ for interpolated strings.
}

或者將值回傳MainSelect1()給呼叫該MainSelect2()方法的呼叫者。

public static void Main()
{
    // get the temperature
    int C = MenuSelect1();

    // pass it to the other method.
    MenuSelect2(C);

    Console.ReadKey();
}


public static int MenuSelect1()  // <- change the signature (return int)
{
    while (true)
    {
      int F = 0;
      Console.Write("\nType how many degrees Fahrenheit you want: ");

      try
      {
        F = Convert.ToInt32(Console.ReadLine());
      }
      
      catch (Exception e)
      {
        Console.ForegroundColor = ConsoleColor.DarkRed;
        Console.WriteLine("ERROR!");
        Console.ForegroundColor = ConsoleColor.White;
      }

      int C = SecondClass.FtoC(F);

      if (C < 80 || C > 87)
      {
        Console.WriteLine("Try a different temperature.");
      }
      else
      {
        Console.WriteLine(C   "°C is perfect. Start the sauna and enjoy!");
        
        return C; // return the value to the caller.
      }
    }
}

public static void MenuSelect2(int C)
{
    Console.WriteLine("Starting Sauna. Wait for it to reach desired temperature...");
    Console.Write($"Temperature: {C}");   // <- notice the $ for interpolated strings.
}

我寧愿使用第二個建議，因為這種方式MenuSelect1()不會緊密耦合，MenuSelect2()并且可以重用于其他目的。

uj5u.com熱心網友回復：

此時的問題是變數C被實體化并存盤在方法MenuSelect1（）中，你應該做的是創建一個類變數int fahrenheitValue，然后在menuSelect1方法中使用this.fahrenheitValue = C，因此值存盤在類變數中，然后你可以從任何地方訪問它

uj5u.com熱心網友回復：

一旦方法結束，MenuSelect1() 中定義的所有變數都將不可見。

您可以在“SecondClass”中定義一個靜態屬性

private static int degreesCelsius;

然后你可以設定這個屬性

if (C < 80 || C > 87)
{
    Console.WriteLine("Try a different temperature.");
}
else
{
    Console.WriteLine(C   "°C is perfect. Start the sauna and enjoy!");
    degreesCelsius = C;
    break;
}

在您的 MenuSelect2() 方法中，您可以使用它。

Console.Write("Temperature: {0}", degreesCelsius);

uj5u.com熱心網友回復：

您還可以將 的值保存C為類中的屬性/欄位。這是將其保存為名為的欄位的示例_celcius：

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


  public static class SecondClass {

  private static int _celcius = 0;  // <--- Your field

  public static int FtoC(int fahrenheit)
  {
    int C = ((fahrenheit - 32) * 5) / 9;
    return C;
  }

  
  public static void MenuSelect1()
  {
    while (true)
    {
      int F = 0;
      Console.Write("\nType how many degrees Fahrenheit you want: ");

      try
      {
        F = Convert.ToInt32(Console.ReadLine());
      }
      
      catch (Exception e)
      {
        Console.ForegroundColor = ConsoleColor.DarkRed;
        Console.WriteLine("ERROR!");
        Console.ForegroundColor = ConsoleColor.White;
      }

      _celcius = SecondClass.FtoC(F);   // <--- Assign field here

      if (_celcius  < 80 || _celcius  > 87)
      {
        Console.WriteLine("Try a different temperature.");
      }
      else
      {
        Console.WriteLine(_celcius   "°C is perfect. Start the sauna and enjoy!");
        break;
      }
    }
    Console.ReadKey();
  }

   
  public static void MenuSelect2()
  {
    Console.WriteLine("Starting Sauna. Wait for it to reach desired temperature...");
    Console.Write("Temperature: {0}", _celcius); // <--- Use your field here
    Console.ReadKey();
  }
    

}```

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