Question

我的导师为我设定了制作C＃程序的任务

演示递归（我想我已经完成了）
使用全局变量
可供企业使用

这就是我想出的。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。我在考虑减税，但每次开始我都会忘记我的想法。

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();
    }
}

Answer 1

C＃没有全局变量的特定概念，但是您可以使用公共静态属性或字段来实现效果，然后可以通过类访问它。例如：

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

GlobalVariabels.TaxRate访问。

public允许我们从类外部访问变量。 static表示我们不需要GlobalVariables类的实例来访问它（尽管您确实需要在类的上下文之外查看类名。

正如Preston指出的那样，你可以使你的GlobalVariables类保持静态，因为实际上没有任何理由来实例化它的实例（尽管它没有必要）。

Answer 2

对于你的＆＃34;全局变量，＆＃34; （引用因为看here）寻找可以移出方法的东西。

您最好的选择是在调用nameCheck方法之间不变的变量 - string[] employees = { "Emp1", "Emp2", "Emp3", "Emp4" };。

由于您没有发布显示使用多个类的代码，因此在方法之外移动employees是您最好的选择。如果您已经在课堂上学过多个课程，那么请将您在那里学到的知识用于组织代码。看看static也是如此。

Answer 3

您也可以使用

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

也

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

Answer 4

我已对您的逻辑进行了更改，首先它会读取文件一次，检查文件是否存在，否则会创建它。添加了评论并修复了结构，删除了不必要的变量，并将以前的答案考虑在内以帮助您解决问题。

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();
        }
    }
}

Answer 5

C＃是一种面向对象的编程语言，这意味着您可以通过作为类实现的对象访问所有内容。因此，如果可以访问类和成员，则可以看到每个变量（在这种情况下的成员），可以通过将它们声明为 public 来完成。

我在哪里可以在我的c＃程序中使用全局变量？

5 个答案: