我用解构器写了这样一个类。但是我在这一行得到一个错误：(string model) = car;

var car = new Car();
car.model = "GLE";
(string model) = car;
Console.WriteLine(model);

汽车类别定义为：

public class Car
{
    public string model = "undefined";

    public void Print()
    {
        Console.WriteLine(model);
    }

    public void Deconstruct(out string model)
    {
        model = this.model;
    }
}