CS7036:There 没有给出对应于所需形式参数 'i' 的参数

Question

刚学C#，做了两个外部类构造函数，一个继承另一个。但它给出了错误： 严重性代码描述项目文件行抑制状态 错误 CS7036 没有给定的参数对应于 'Engineer.Engineer(string)' program.cs 的所需形式参数 'i' C:\Users\win 10\Desktop\C#\program.cs\program.cs\Car.cs 41 活动 这三个代码文件是： 1/ main.cs:

using System;

namespace program
{
    class Core
    {
        static void Main(string[] args)
        {
            Car BMW = new Car("X-A-21-A-X", 3200000, "Reddish-brown", false);
            string currentPrice = BMW.CheckPrice("us", BMW.price);
            if(!double.TryParse(currentPrice, out var q))
            {
                Console.WriteLine(currentPrice);
            }else if(double.TryParse(currentPrice, out var z))
            {
                double converted_Price = Convert.ToDouble(currentPrice);
                Console.WriteLine(converted_Price);
            }
            Console.WriteLine(BMW.model);
        }
    }
}

2/Car.cs:

using System;
namespace program
{
    class Car : Engineer
    {
        private string _model;
        public string model
        {
            get { return _model; }
            set { _model = value; }
        }
        public double price;
        public string color;
        public bool available;
        public string CheckPrice(string locale, double price)
        {
            string ret = default(string);
            if(locale == "in")// India
            {
                ret = Convert.ToString(2.14 * price);
            }else if(locale == "us")// USA
            {
                ret = Convert.ToString(3.98 * price);
            }else if(locale == "jp")// Japan
            {
                ret = Convert.ToString(1.3 * price);
            }else if(locale == "vn")//Vietnam
            {
                ret = Convert.ToString(0.78645 * price);
            }else if(locale == "ch")//China
            {
                ret = Convert.ToString(2.56 * price);
            }
            else
            {
                ret = "Invalid Locale, Your Country does not ship the car.";
            }
            Console.WriteLine(_model);
            return ret;
        }
        public Car(string modelName, double priceVal, string ColorName, bool avail) /* 'Car' in this line is causing problems*/
        {
            model = modelName;
            price = priceVal;
            color = ColorName;
            available = avail;
        }
    }
}

3/Engineer.cs:

using System;

namespace program
{
    class Engineer
    {
        private string creatorCompany;
        public string creator_Company
        {
            get { return creatorCompany; }
            set { creatorCompany = value; }
        }
        public Engineer(string i)
        {
            creator_Company = i;
        }
    }
}

那里有答案，但我看不懂。请向我解释它们就像我是一个不知道 sh*t

的僧侣

Answer 1

您需要将默认构造函数添加到 Engineer class。因为当您创建派生的实例时，它会在派生 class 构造函数之前调用基 class 构造函数。

public Engineer()
{
}

Answer 2

如果Car是Engineer

在 Car 是 Engineer 的不太可能的情况下，Car 需要提供 creatorCompany:

1. Engineer 定义指出必须提供 creatorCompany
2. Car 是 Engineer
3. Car 必须提供 creatorCompany.

它可能看起来像这样：

public Car(
  string creatorCompany, // Added
  string modelName, 
  double priceVal, 
  string ColorName, 
  bool avail) 
: base(i: creatorCompany) // Added
{
   model = modelName;
   price = priceVal;
   color = ColorName;
   available = avail;
}

如果Car不是Engineer

在这种情况下，解决方法是去掉: Engineer:

class Car : Engineer

变为：

class Car

Answer 3

我找到了答案，我只需要将engineer的构造函数class添加到car。我从 Engineer 文件中删除了构造函数，并向“Car”的构造函数添加了另一个参数并将其设置在那里。