我的订单总额是“从未分配给”，并且总是将其值设置为 0。我该如何解决这个问题？ [复制]

Question

我的代码块有几个问题。一切正常，但我的总数始终为 0。屏幕底部的警告说明如下：“'Order.Total' 从未分配给，并且始终具有其默认值 0”。

如何修复此警告标志？

我还收到一条警告，说我的 EqualsTo() 语句正在被覆盖，但 Object.GetHashCode() 没有被覆盖。如何修复这 2 个小错误？

如果您想将其放入您的 IDE 并尝试自行调试，我将提供整个代码...我还将粘贴一部分我认为会导致最终问题的代码始终默认为 0。

整个代码

using System;

namespace Order 
{
    class Program
    {
        static void Main(string[] args)
        {
            // creating the orders
            Order order1 = new Order(1, "Joe Bob", 2);
            Order order2 = new Order(3, "Sally Bob", 4);
            Order order3 = new Order(1, "Jimmy Bob", 5);
            Console.WriteLine(order1.ToString() + "\n");
            Console.WriteLine(order2.ToString() + "\n");
            Console.WriteLine(order3.ToString() + "\n");

            //checks for duplicates
            CheckDuplicate(order1, order2);
            CheckDuplicate(order2, order3);
            CheckDuplicate(order1, order3);
        }
        // output for duplicates
        public static void CheckDuplicate(Order firstOrder, Order secondOrder)
        {
            if (firstOrder.Equals(secondOrder))
            {
                Console.WriteLine("The two orders are the same!");
            }
            else
            {
                Console.WriteLine("The two orders are not the same!");
            }
        }
    }

    class Order
    {
        // setting properties
        double itemPrice = 12.35;
        public int OrderNum { get; set; }
        public string CustomerName { get; set; }
        public double Quantity;
        private readonly double Total;

        // total price
        public double GetTotal()
        {
            double Total = Quantity * itemPrice;
            return Total;
        }


        // equals to method
        public override bool Equals(Object o)
        {
            bool isEqual = true;
            if (this.GetType() != o.GetType())
                isEqual = false;
            else
            {
                Order temp = (Order)o;
                if (OrderNum == temp.OrderNum)
                    isEqual = true;
                else
                    isEqual = false;
            }
            return isEqual;
        }
        // default constructor
        public Order(int OrderNum, string CustomerName, double Quantity)
        {
            this.OrderNum = OrderNum;
            this.CustomerName = CustomerName;
            this.Quantity = Quantity;
        }
        // returns final output
        public override string ToString()
        {
            return ("Order Number       : " + OrderNum) + "\n" + ("Customer name      : " + CustomerName) + "\n" + ("Quantity Ordered   : " + Quantity) + "\n" + ("Totatl Price       : " + Total);
        }
    }
}

WARNING 的部分代码

class Order
    {
        // setting properties
        double itemPrice = 12.35;
        public int OrderNum { get; set; }
        public string CustomerName { get; set; }
        public double Quantity;
        private readonly double Total;

        // total price
        public double GetTotal()
        {
            double Total = Quantity * itemPrice;
            return Total;
        }


        // equals to method
        public override bool Equals(Object o)
        {
            bool isEqual = true;
            if (this.GetType() != o.GetType())
                isEqual = false;
            else
            {
                Order temp = (Order)o;
                if (OrderNum == temp.OrderNum)
                    isEqual = true;
                else
                    isEqual = false;
            }
            return isEqual;
        }
        // default constructor
        public Order(int OrderNum, string CustomerName, double Quantity)
        {
            this.OrderNum = OrderNum;
            this.CustomerName = CustomerName;
            this.Quantity = Quantity;
        }
        // returns final output
        public override string ToString()
        {
            return ("Order Number       : " + OrderNum) + "\n" + ("Customer name      : " + CustomerName) + "\n" + ("Quantity Ordered   : " + Quantity) + "\n" + ("Totatl Price       : " + Total);
        }
    }

Answer 1

正如 cmets 所示，没有调用 GetTotal() 将值分配给 Total。

如果你不想调用GetTotal，你可以把那个公式放在构造函数中，然后分配Total值。