Question

我是C＃的新手，我正在尝试使用基本的I / O程序来询问用户名称和年龄。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（）方法也提供了错误Does not exist in current context。据我所知，这遵循C＃中的规则，我被声明为稍后使用的方法，并且声明是在类中进行的，所以它应该没问题？

谢谢所有我对它进行了分类。我按照书中所说的方式输入了程序，无论如何都是一节课。

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()放入课程中，例如您当前的课程;

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，如果您只是从那里需要它们，则不需要将您的方法设置为静态，这一切都取决于您希望如何访问他们或更多，你想从

访问它们

Answer 2

您的方法需要在类中，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()方法超出了类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，每个方法必须在类中。

您已定义程序

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

然后在结束括号后定义GetUserData - 将其移到类定义中。

Answer 5

该方法必须在类

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，代码应该包含在类中。可以通过将GetUserData（）移动到程序类来解决错误

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;
  }   
}

初学者：C＃输入输出程序问题

6 个答案: