如何调用类中的方法

本文关键字：方法 调用 何调用 | 更新日期: 2023-09-27 18:01:51

自学c#(不是家庭作业)。我编写了一个TotalDue方法来计算所有到期客户余额的总和(来自数组)。将它放在Customer类中，这样它就可以访问数据。我不知道如何在main中调用这个方法。如何显示总数?

class Program
{
    static void Main(string[] args)
    {
        Customer[] customers = new Customer[2];
        string customer;
        int id;
        double due;
        // GET DATA AND FILL ARRAY
        for (int x = 0; x < customers.Length; ++x)
        {
            GetData(out customer, out id, out due);
            customers[x] = new Customer(customer, id, due);
        }
        // SORT ARRAY - NEEDS ICOMPARABLE<Customer> - PART 1
        Array.Sort(customers);

        // PRINT ARRAY WITH TOSTRING() OVERRIDE
        for (int x = 0; x < customers.Length; ++x)
        {
            Console.WriteLine(customers[x].ToString());
        }
        //DON'T KNOW HOW TO CALL THE TOTAL DUE METHOD...

        Console.ReadLine();
    }
    class Customer : IComparable<Customer>  // SORT ARRAY - PART 2
    {
        private string CustomerName { get; set; }
        private int IdNumber { get; set; }
        private double BalanceDue { get; set; }
        // CONSTRUCTOR
        public Customer(string customer, int id, double due)
        {
            CustomerName = customer;
            IdNumber = id;
            BalanceDue = due;
        }
        //SORT THE ARRAY - PART 3
        public int CompareTo(Customer x)
        {
            return this.IdNumber.CompareTo(x.IdNumber);
        }
        // OVERRIDE TOSTRING TO INCLUDE ALL INFO + TOTAL
        public override string ToString()
        {
            return ("'nCustomer: " + CustomerName + "'nID Number: " + IdNumber + "'nBalance Due: " + BalanceDue.ToString("C2"));
        }
        // TOTAL DUE FOR ALL CUSTOMERS
        static void TotalDue(Customer [] customers)
        {
            double Total = 0;
            for (int x = 0; x < customers.Length; ++x)
                Total += customers[x].BalanceDue;
            Console.WriteLine("Total Amount Due:  {0}", Total.ToString("C2"));
        }
    }
    // GET DATA METHOD
    static void GetData(out string customer, out int id, out double due)
    {
        Console.Write("Please enter Customer Name:  ");
        customer = Console.ReadLine();
        Console.Write("Please enter ID Number:  ");
        int.TryParse(Console.ReadLine(), out id);
        Console.Write("Please enter Balance Due:  $");
        double.TryParse(Console.ReadLine(), out due);
    }
}

如何调用类中的方法

将TotalDue方法public设置为c#默认的访问修饰符为private，然后再尝试。

class Customer : IComparable<Customer>  // SORT ARRAY - PART 2
{
     public static void TotalDue(Customer [] customers)
     {
        double Total = 0;
        for (int x = 0; x < customers.Length; ++x)
            Total += customers[x].BalanceDue;
        Console.WriteLine("Total Amount Due:  {0}", Total.ToString("C2"));
     }
}
static void Main(string[] args)
{
    // ...........
    //............
     Customer.TotalDue(customers);
}

c#默认的访问修饰符是private。由于您的TotalDue方法没有指定任何其他内容，因此它是private。您可以将其更改为public，并从Main调用它。

在静态方法中添加公共访问修饰符，并使用类名调用它，或者删除static关键字，使其成为实例并调用类方法

让你的Customer类方法(TotalDue)公开而不是静态…

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