主程序是:
Car[] car = new Car[3];
            try
            {
                car[0].Name = "奔驰车";
                car[0].Color = "红";
                car[0].ProductPlace = "德国";
               
                car[1].Name = "宝马车";
                car[1].Color = "银灰";
                car[1].ProductPlace = "德国";
               
                car[2].Name = "宝马车";
                car[2].Color = "银灰";
                car[2].ProductPlace = "德国";
              
                for (int i = 0; i < 3; i++)
                {
                    Console.Write("我是一辆" + car[i].Name + ","
                        + car[i].Color + "颜色,产地是" + car[i].ProductPlace);
                                   }
               
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            Console.ReadLine();

类是:
        private string name;

        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        private string color;

        public string Color
        {
            get { return color; }
            set { color = value; }
        }
        private string productPlace;

        public string ProductPlace
        {
            get { return productPlace; }
            set { productPlace = value; }
        }
        private int speed;
出现:末将对象实例引用设置到对象的实例

Car[] car = new Car[3]{new Car(),new Car(),new Car()};
这样就应该正确了～

car[0] = new Car();这样开辟堆空间，才有对象实例给你用。