初学者：C#输入输出程序问题

Question

我是 C# 新手，我正在尝试让一个基本的 I/O 程序工作，以询问用户的姓名和年龄。该程序不允许我运行，因为“static void GetUserData()”部分，给出了这个错误：

Expected class, delegate, enum, interface, or struct. 
It does not like the void keyword.

GetUserData() 方法也给出错误Does not exist in current context。据我所知，这遵循 C# 中的规则，我声明了一个稍后使用的方法，并且声明是在一个类中进行的，所以应该可以吗？

谢谢大家，我把它整理好了。我完全按照书上所说的方式输入了程序，无论如何这是一个教训。

---

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

namespace BasicConsoleIO
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("basic input output");
            GetUserData();
            Console.ReadLine();
        }
    }

    static void GetUserData()
    {
    Console.Write("please enter your name: ");
    string userName = Console.ReadLine();
    Console.Write("please enter your age: ");
    string userAge = Console.ReadLine();

    //changes echo colour
    ConsoleColor prevColor = Console.ForegroundColor;
    Console.ForegroundColor = ConsoleColor.red;

    //echo to console
    Console.WriteLine("hello {0}! Your are {1} years old.", userName, userAge);

    //Restore previous color
    Console.ForegroundColor = prevColor;
    }   
}

Answer 1

将GetUserData() 放入一个类中，例如你目前拥有的那个；

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("basic input output");
        GetUserData();
        Console.ReadLine();
    }

    static void GetUserData()
    {
        Console.Write("please enter your name: ");
        string userName = Console.ReadLine();
        Console.Write("please enter your age: ");
        string userAge = Console.ReadLine();

        //changes echo colour
        ConsoleColor prevColor = Console.ForegroundColor;
        Console.ForegroundColor = ConsoleColor.red;

        //echo to console
        Console.WriteLine("hello {0}! Your are {1} years old.", userName, userAge);

        //Restore previous color
        Console.ForegroundColor = prevColor;
    }   
}

此外，由于它们位于相同的命名空间和类中，如果您只需要从那里使用它们，则无需将您的方法设置为静态，这完全取决于您希望如何访问它们，或者更多，你想从哪里访问它们

Answer 2

您的方法需要在一个类中，如下所示：

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("basic input output");
        GetUserData();
        Console.ReadLine();
    }

    static void GetUserData()
    {
        ...
    }
}

Answer 3

GetUserData() 方法超出类Program 的范围。应该是：

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("basic input output");
            GetUserData();
            Console.ReadLine();
        }

        static void GetUserData() {/*code here*/}
    }

Answer 4

在 C# 中，每个方法都必须在一个类中。

你已经定义了你的程序

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("basic input output");
        GetUserData();
        Console.ReadLine();
    }
}

然后在右大括号之后定义GetUserData - 将其移到类定义中。

Answer 5

方法必须在类中

namespace BasicConsoleIO
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("basic input output");
            GetUserData();
            Console.ReadLine();
        }

        static void GetUserData()
        {
            Console.Write("please enter your name: ");
            string userName = Console.ReadLine();
            Console.Write("please enter your age: ");
            string userAge = Console.ReadLine();

            //changes echo colour
            ConsoleColor prevColor = Console.ForegroundColor;
            Console.ForegroundColor = ConsoleColor.Red;

            //echo to console
            Console.WriteLine("hello {0}! Your are {1} years old.", userName, userAge);

            //Restore previous color
            Console.ForegroundColor = prevColor;
        }
    }
}

Answer 6

基本上在 C# 中代码应该包含在一个类中。可以通过将 GetUserData() 移动到程序类来解决该错误

class Program
{
    static void Main(string[] args)
    {
     Console.WriteLine("basic input output");
     GetUserData();
     Console.ReadLine();
    }

 static void GetUserData()
  {
    Console.Write("please enter your name: ");
    string userName = Console.ReadLine();
    Console.Write("please enter your age: ");
    string userAge = Console.ReadLine();

    //changes echo colour
    ConsoleColor prevColor = Console.ForegroundColor;
    Console.ForegroundColor = ConsoleColor.red;

    //echo to console
    Console.WriteLine("hello {0}! Your are {1} years old.", userName, userAge);

    //Restore previous color
    Console.ForegroundColor = prevColor;
  }   
}