if-else语句是否出现在C＃的Main函数之外？

Question

我对C＃和面向对象编程都很新。我想弄清楚为什么这个程序不能编译。下面是一个真实给我的麻烦代码片段：

static void AdvancePreLvlThree() // advances player to next level when level is less than three 
{ 
    if(level == 1) 
    { 
     xp = (xp - 100); // carries remaining xp over to next level 
    } 
    else if(level == 2) 
    { 
     xp = (xp - 150); 
    } 

    level +=1; // advances 
    return Update(); // checks again to see if they can advance further 
} 

完整的程序：

/////////////////////////////////////////////////////// 
// 
// A namespace/program for managing experience points 
// and determining if the player can level up. 
// 
// Written by Jared Beach 
// January 19, 2013 
// 
////////////////////////////////////////////////////// 

using System; 
namespace LevelSystem 
{ 
    public class LevelSystem 
    { 
     public void LevelStorage() 
     { 
      int level = 1; // stores player level 
     } 

     public void XPStorage() 
     { 
      int xp = 0; // stores player xp 
     } 

     public void XPRequirement() // xp required to advance to the next level 
     { 
      int maxXP = (8 * level^3); 

     static void AdvancePreLvlThree() // advances player to next level when level is less than three 
     { 
      if(level == 1) 
      { 
       xp = (xp - 100); // carries remaining xp over to next level 
      } 
      else if(level == 2) 
      { 
       xp = (xp - 150); 
      } 

      level +=1; // advances 
      return Update(); // checks again to see if they can advance further 
     } 

     static void Advance() // advances player to next level 
     { 
      xp = (level - maxXP); // carries remaining xp over to next level 
      level +=1; 
      return Update(); 
     } 

     static void Update() // checks to see if player can advance levels 
     { 
      if(level == 1 && xp > 100) // special case to keep basic progression ratio close to one 
      { 
       AdvancePreLvlThree(); 
      } 
      else if(level == 3 && xp > 150) 
      { 
       AdvancePreLvlThree(); 
      } 
      else if(xp >= 3 && xp > maxXP) 
      { 
       return Advance(); 
      } 
     } 
    } 

    public class Program 
    { 
     static void Main(string[] args) 
     { 

     } 
    } 
} 

我得到的错误是：

Program.cs(30,8): error CS1525: Unexpected symbol `static' 
Program.cs(30,16): error CS1547: Keyword `void' cannot be used in this context 
Program.cs(30,38): error CS1525: Unexpected symbol `(' 
Program.cs(36,16): error CS1519: Unexpected symbol `else' in class, struct, or interface member declaration 
Program.cs(36,28): error CS1519: Unexpected symbol `==' in class, struct, or interface member declaration 
Program.cs(38,20): error CS1519: Unexpected symbol `=' in class, struct, or interface member declaration 
Program.cs(38,26): error CS1519: Unexpected symbol `-' in class, struct, or interface member declaration 
Program.cs(41,12): error CS1525: Unexpected symbol `level' 

这不是在同一个班我主要是如果这是相关的。

Answer 1

正如其他人所说，你需要在这种情况下显示你所有的代码，因为它听起来像别的东西在你的代码中缺少/错误，并在这一点上突破。这里有一个你正在尝试做的事情的例子，虽然它看起来不是一个很好的方法，有很多static项目，你应该看看Object Oriented Programming！

namespace ConsoleApplication1 
{ 
    class Program 
    { 
     private static int level = 0; 
     private static int xp = 0; 

     static void Main(string[] args) 
     { 
      AdvancePreLvlThree(); 
     } 

     static bool AdvancePreLvlThree() // advances player to next level when level is less than three 
     { 
      if(level == 1) 
      { 
       xp = (xp - 100); // carries remaining xp over to next level 
      } 
      else if(level == 2) 
      { 
       xp = (xp - 150); 
      } 

      level +=1; // advances 
      return Update(); // checks again to see if they can advance further 
     } 

     static bool Update() 
     { 
      // Yes they can... 
      return true; 
     } 
    } 
} 

我使你的AdvancePreLvlThree方法返回一个布尔值，因为这是你试图做的，但该方法被标记为无效？无论如何，希望这会让你开始？

Answer 2

几件事情，

1. 你的方法被声明为无效，并返回更新，因此使该方法相同的返回类型的更新。
2. 如果您的方法与main不在同一个类中，则将该方法设为public，并在包含main的类中引用新类。
3. 在使用它们之前声明XP和级别为可变参数，并在方法级别范围内声明它们。
4. 此方法应与更新在同一个类中。