枚举里面有汽车的颜色为黑色白色灰黑色

如果汽车没有颜色的时候默认值为黑色怎么写 在构造方法里面写这个

using System;
using System.Collections.Generic;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            // 指定了颜色参数的构造函数
            var car1 = new Car("奥迪Q5L", "奥迪", 456800, Color.Gray);
            Console.WriteLine(car1.ToString());
            // 没有指定颜色参数的构造函数
            var car2 = new Car("沃尔沃XC60新能源", "沃尔沃", 425600);
            Console.WriteLine(car2.ToString());
        }
    }

    public enum Color
    {
        Black,
        White,
        Gray,
        GrayBlack
    }

    public class Car
    {
        public Car(string name,string brand, decimal price, Color color=Color.Black)
        {
            Name = name;
            Brand = brand;
            Color = color;
            Price = price;
        }

        public string Name { get; set; }
        public string Brand { get; set; }
        public Color Color { get; set; }
        public decimal Price { get; set; }

        /// <summary>Returns a string that represents the current object.</summary>
        /// <returns>A string that represents the current object.</returns>
        public override string ToString()
        {
            return $"洗车名称：{Name},品牌：{Brand},颜色：{Color},价格：{Price}";
        }
    }
}

运行结果：

洗车名称：奥迪Q5L,品牌：奥迪,颜色：Gray,价格：456800
洗车名称：沃尔沃XC60新能源,品牌：沃尔沃,颜色：Black,价格：425600

public class car{
public string color{set;get;}="黑色";
}