在c#程序中，哪里可以使用全局变量

我的导师给我安排了一项任务，让我制作一个

演示递归（我想我已经做到了）
使用全局变量
可以被企业使用

这就是我想到的。它只需要是一个小程序，但我不知道在哪里可以使用全局变量。我一直在想一些减税的办法，但每次我开始的时候，我都忘了我的想法是什么。

static void nameCheck()
{
    Console.WriteLine("Name of employee: ");
    string employee = Console.ReadLine();
    string[] employees = { "Emp1", "Emp2", "Emp3", "Emp4" };
    File.WriteAllLines("C:/Users/Chris/Documents/Visual Studio 2013/Projects/ConsoleApplication38/Employees.txt", employees);
    string[] lines = File.ReadAllLines("C:/Users/Chris/Documents/Visual Studio 2013/Projects/ConsoleApplication38/Employees.txt");
    int match = 0;
    foreach (string line in lines)
    {
        if (employee != line)
        {
            match = match + 1;
            if (match > 3)
            {
                Console.WriteLine("That name is not in the employee database, try again:");
                nameCheck();
            }
        }
    }
}
static double payRoll(double hours, double wage)
{
    double pay = hours * wage;
    return pay;
}
static void Main(string[] args)
{
    Console.WriteLine("                                   PAYROLL");
    Console.WriteLine("--------------------------------------------------------------------------------");
    nameCheck();
    Console.WriteLine("Number of hours worked this week: ");
    int hours = Convert.ToInt32(Console.ReadLine());
    const double wage = 7.50;
    double pay = payRoll(hours, wage);
    Console.WriteLine("Pay before tax for this employee is £" + pay);
    Console.ReadLine();
    }
}

C#没有全局变量的特定概念，但您可以通过公共静态属性或字段来实现这种效果，然后您可以通过类访问该属性或字段。例如：

public class GlobalVariables
{
    public static double TaxRate {get; set;}
}

在GlobalVariabels.TaxRate访问。

public允许我们从类外部访问变量。static意味着我们不需要GlobalVariables类的实例来访问它（尽管您确实需要在类的上下文之外遍历类名。

正如Preston所指出的，您可以使GlobalVariables类成为静态的，因为实际上没有任何理由实例化它的实例（尽管这不是必要的）。

对于您的"全局变量"，（引用，因为请参阅此处）查找可以从方法中移出的内容。

最好的选择是在对nameCheck方法string[] employees = { "Emp1", "Emp2", "Emp3", "Emp4" };的调用之间不发生变化的变量。

由于您没有发布显示使用多个类的代码，因此最好将employees移到方法之外。如果您已经在课堂上学习了多个类，那么就用您在那里学到的内容来组织代码。还可以看一眼静态。

您也可以像一样使用

    static double payRoll(double hours, double wage)
    {
        return hours * wage;
    }

还有

int hours = Convert.ToInt32(Console.ReadLine()); //why this is an Int should be double

我对您的逻辑进行了更改，首先它读取文件一次，检查文件是否存在，否则它会创建它。添加注释并修复结构，删除不必要的变量，并考虑以前的答案来帮助您。

namespace Temp1
{
    using System;
    using System.IO;
    public class GlobalVariables
    {
        /// <summary>
        /// Wage per hour
        /// </summary>
        public static double WagePerHour = 7.5;
    } 
    public class Program
    {
        private static void LoadEmployees()
        {
            // Get the name of the employee
            Console.WriteLine("Name of employee: ");
            string employee = Console.ReadLine();
            // Get the file path
            string filePath = string.Format(
                @"{0}{1}",
                Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location),
                "Employees.txt");
            // Check if the file does not exist and create it
            if (!File.Exists(filePath))
            {
                // Generate sample employees
                string[] employees = { "Emp1", "Emp2", "Emp3", "Emp4" };
                // Write all the lines in the file
                File.WriteAllLines(filePath, employees);
            }
            // Read all the lines from the file
            string[] currentEmployees = File.ReadAllLines(filePath);
            // Check the employee name
            NameCheck(currentEmployees, employee);
        }
        /// <summary>
        /// Do the name check recursively so you don’t keep loading the file all the time
        /// </summary>
        /// <param name="names">Array of all the employee names</param>
        /// <param name="nameToFind">Name to find</param>
        /// <param name="currentPosition">Current position in the array</param>
        public static void NameCheck(string[] names, string nameToFind, int currentPosition = 0)
        {
            if (currentPosition == nameToFind.Length - 1)
            {
                Console.WriteLine("That name is not in the employee database, try again:");
            }
            else if (string.Compare(names[currentPosition], nameToFind, StringComparison.InvariantCulture) != 0)
            {
                currentPosition++;
                NameCheck(names, nameToFind, currentPosition);
            }
        }
        /// <summary>
        /// Calculate pay roll
        /// </summary>
        /// <param name="hours"></param>
        /// <param name="wage"></param>
        /// <returns></returns>
        private static double PayRoll(double hours, double wage)
        {
            return hours * wage;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="args"></param>
        private static void Main(string[] args)
        {
            Console.WriteLine("                                   PAYROLL");
            Console.WriteLine("--------------------------------------------------------------------------------");
            // Load employees and check if the employee is in the list
            LoadEmployees();
            // Get the number of hours worked
            Console.WriteLine("Number of hours worked this week: ");
            double hours = Convert.ToDouble(Console.ReadLine());
            // Get the current pay
            double pay = PayRoll(hours, GlobalVariables.WagePerHour);
            Console.WriteLine("Pay before tax for this employee is £" + pay);
            Console.ReadLine();
        }
    }
}

C#是一种面向对象的编程语言，这意味着您可以通过一个类的实现对象访问所有内容。因此，如果类和成员都是可访问的，则每个变量（在这种情况下为成员）都是可见的，这可以通过将它们声明为public来实现。

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