方法:搜索类实例

我需要的建议是位于代码底部附近的"Equals"方法。请注意，Equals 方法必须包含在 Order 类中，如果您想知道为什么我没有使用它们，我无法使用自动实现的属性，哈哈。equals 方法的功能是搜索所有当前订单号（目前有 1 个用户和 3 个自动）以查找重复项。我无法弄清楚如何在没有用户输入或不使用一堆"if"语句的情况下做到这一点。任何建议都会很棒，谢谢。~~底部的另外两个方法都没完~~

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Assignment3
{
  class Program
  {
    static void Main(string[] args)
    {
        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!
        // USER CONTROLLED
        int ordNum;
        Console.Write("Enter Order Number: ");
        ordNum = Convert.ToInt16(Console.ReadLine());
        string custName;
        Console.Write("Enter Customer Name: ");
        custName = Console.ReadLine();
        int quantity;
        Console.Write("Enter Quantity: ");
        quantity = Convert.ToInt32(Console.ReadLine());
        Order firstOrder = new Order(ordNum, custName, quantity);
        Console.WriteLine("Customer: {0}'nOrder Number: {1}'nQuantity" +
        "Ordered: {2}'nTotal Price: {3}", firstOrder.Customer, firstOrder.OrderNum, firstOrder.QuantityOrd, firstOrder.Total);
        // USER CONTROLLED
        // AUTOMATED
        // FIRST
        int firstOrdNum = 678123;
        string firstName ="P Jenkins";
        int firstQuantity = 35;
        Order firstAutomated = new Order(firstOrdNum, firstName, firstQuantity); // first Instance of Order
        // END OF FIRST
        // SECOND
        int secondOrdNum = 678123;
        string secondName = "L Jenkins";
        int secondQuantity = 35;
        Order secondAutomated = new Order(secondOrdNum, secondName, secondQuantity);
        // END OF SECOND
        // THIRD
        int thirdOrdNum = 49284;
        string thirdName = "McDonalds";
        int thirdQuantity = 78;
        Order thirdAutomated = new Order(thirdOrdNum, thirdName, thirdQuantity);
        // END OF THIRD
        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    }
}
class Order
{
    private int orderNum;
    private string customer;
    private int quantityOrd;
    public const double amt = 19.95;
    private double totalPrice;
    // PROPERTIES TO ACCES PRIVATE DATA
    public int OrderNum // CHECK
    {
        get
        {
            return orderNum;
        }
        set
        {
            orderNum = value;
        }
    }
    public string Customer // CHECK
    {
        get
        {
            return customer;
        }
        set
        {
            customer = value;
        }
    }
    public int QuantityOrd // CHECK
    {
        get
        {
            return quantityOrd;
        }
        set
        {
            quantityOrd = value;
            CalcTotalPrice();
        }
    }
    public double Total // CHECK
    {
        get
        {
            return totalPrice;
        }
    }      
    // CALCULATE TOTAL
    private void CalcTotalPrice()
    {
        totalPrice = QuantityOrd * amt;
    }
    // EQUALS METHOD 
    public void Equals(int ordNum1, int ordNum2)
    {
        Console.WriteLine("The two orders by P Jenkens (Order Number: {0}) and L Jenkens (Order Number: {1})" +
            "are the same order!", ordNum1, ordNum2);
    }
    public void GetHashCode(string customer, double hashCode)
    {
        Console.WriteLine("The Hash Code of Customer {0} is {1}", customer, hashCode);
    }
    public void ToString()
    {
    }

    // CONSTRUCTOR TO ACCEPT VALUES
    public Order(int ordNum, string cust, int qntOrd)
    {
        OrderNum = ordNum;
        Customer = cust;
        QuantityOrd = qntOrd;
    }
}