错误 CS1061：类型“BikeCostDetails.Bike”不包含“CalculateFinalCost”的定义

Question

文件 - Bike.cs

namespace BikeCostDetails
{
public class Bike
{
    private string bikeName;
    private string bikeType;
    private double bikeCost;
    private double onRoadPrice;

    public string BikeName
    {
        get
        {
            return this.bikeName;
        }
        set
        {
            this.bikeName = value;
        }
    }
    public string BikeType
    {
        get
        {
            return this.bikeType;
        }
        set
        {
            this.bikeType = value;
        }
    }
    public double BikeCost
    {
        get
        {
            return this.bikeCost;
        }
        set
        {
            this.bikeCost = value;
        }
    }
    public double OnRoadPrice
    {
        get
        {
            return this.onRoadPrice;
        }
        set
        {
            this.onRoadPrice = value;
        }
    }

    public bool CheckForBikeType(string bikeType)
    {
        bool flag = false;
        if (bikeType.Equals("naked") || bikeType.Equals("doomed"))
        {
            flag = true;
        }
        return flag;
    }

}
}

文件 2 - Program.cs

using System;
using System.Threading.Tasks;

namespace BikeCostDetails
{
public class Program
{

    public static Bike CalculateFinalCost(Bike bike)
    {

        string type = bike.BikeType;
        double cost = bike.BikeCost;
        double finalCost;
        if (type.Equals("naked"))
        {
            finalCost = cost - (cost * 10 / 100);
        }
        else
        {
            finalCost = cost + (cost * 5 / 100);
        }

        bike.OnRoadPrice = finalCost;
        return bike;
    }


    public static void Main(string[] args)
    {
        Bike b = new Bike();

        Console.WriteLine("Enter the bike name");
        string name = Console.ReadLine();
        Console.WriteLine("Enter bike type");
        string type = Console.ReadLine();
        Console.WriteLine("Enter bike cost");
        double cost = Convert.ToDouble(Console.ReadLine());

        b.BikeName = name;
        b.BikeType = type;
        b.BikeCost = cost;

        if (b.CheckForBikeType(type) == true)
        {
            
            Bike bi = b.CalculateFinalCost(b);
            Console.WriteLine("Thank you for buying " + name + ". You need to pay the amount of Rs " + bi.OnRoadPrice);
        }
        else
        {
            Console.WriteLine("Invalid Bike Type");
        }
    }
}
}

我收到此错误：

错误 CS1061 'Bike' 不包含 'CalculateFinalCost' 的定义，并且找不到接受“Bike”类型的第一个参数的可访问扩展方法 'CalculateFinalCost'（您是否缺少 using 指令或程序集参考？）

有人可以帮我解决这个错误吗？我是 C# 新手。

Answer 1

Bike bi = b.CalculateFinalCost(b); 应该只是 Bike bi = CalculateFinalCost(b); 否 b. 在方法名称之前。错误就是它所说的：Bike 类型不包含CalculateFinalCost 方法。该方法在您的 Program 类中定义。

Answer 2

改变

public static Bike CalculateFinalCost(Bike bike)

到

public static Bike CalculateFinalCost(this Bike bike) 

这将允许你使用你的方法作为类的一部分。

Answer 3

这是最终代码。我在发布问题的同一天解决了它。首先没有注意到错误。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace BikeCostDetails
{
    public class Bike
    {
        private string bikeName;
        private string bikeType;
        private double bikeCost;
        private double onRoadPrice;
        
        public string BikeName{
          get{
            return this.bikeName;
          }
          set{
            this.bikeName = value;
          }
        }
        public string BikeType{
          get{
            return this.bikeType;
          }
          set{
            this.bikeType = value;
          }
        }
        public double BikeCost{
          get{
            return this.bikeCost;
          }
          set{
            this.bikeCost = value;
          }
        }
        public double OnRoadPrice{
          get{
            return this.onRoadPrice;
          }
          set{
            this.onRoadPrice = value;
          }
        }
        
        public bool CheckForBikeType(string bikeType){
          bool flag = false;
          if(bikeType.Equals("naked") || bikeType.Equals("doomed")){
            flag = true;
          }
          return flag;
        }
    }
        
    
  public class Program{
    
      public Bike CalculateFinalCost(Bike bike){
        
        string type = bike.BikeType;
        double cost = bike.BikeCost;
        double finalCost = 0;

         if(type.Equals("naked")){
            finalCost = cost - (cost * 10/100);
         }
         else{
            finalCost = cost + (cost * 5/100);
         }
        
         bike.OnRoadPrice = finalCost;
         return bike;
      }
    
      
      public static void Main(string[] args){
        Bike b = new Bike();
        Program p = new Program();
        Console.WriteLine("Enter the bike name");
        string name = Console.ReadLine();
        Console.WriteLine("Enter bike type");
        string type = Console.ReadLine();
        Console.WriteLine("Enter bike cost");
        double cost = Convert.ToDouble(Console.ReadLine());
        
        b.BikeName = name;
        b.BikeType = type;
        b.BikeCost = cost;

        if(b.CheckForBikeType(type) == true){
          b = p.CalculateFinalCost(b);
          Console.WriteLine("Thank you for buying "+ name+". You need to pay the amount of Rs "+b.OnRoadPrice);
        }
        else{
          Console.WriteLine("Invalid Bike Type");
        }
      }
    }
    
}